<!DOCTYPE html>
<html lang="en-US">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <title> </title>
    <meta name="generator" content="VuePress 1.7.1">
    <link rel="icon" href="/favicon.ico">
    <meta name="description" content=" ">
    <meta name="Description" content="Apache IoTDB: Time Series Database for IoT">
    <meta name="Keywords" content="TSDB, time series, time series database, IoTDB, IoT database, IoT data management,时序数据库, 时间序列管理, IoTDB, 物联网数据库, 实时数据库, 物联网数据管理, 物联网数据">
    <meta name="baidu-site-verification" content="wfKETzB3OT">
    <meta name="google-site-verification" content="mZWAoRY0yj_HAr-s47zHCGHzx5Ju-RVm5wDbPnwQYFo">
    
    <link rel="preload" href="/assets/css/0.styles.679f71b6.css" as="style"><link rel="preload" href="/assets/js/app.ee472f44.js" as="script"><link rel="preload" href="/assets/js/3.49f0f20a.js" as="script"><link rel="preload" href="/assets/js/166.8832a7a4.js" as="script"><link rel="prefetch" href="/assets/js/10.a9e4399a.js"><link rel="prefetch" href="/assets/js/100.68c72120.js"><link rel="prefetch" href="/assets/js/101.b6fa0a59.js"><link rel="prefetch" href="/assets/js/102.a64e2bb2.js"><link rel="prefetch" href="/assets/js/103.3e232964.js"><link rel="prefetch" href="/assets/js/104.12a0c146.js"><link rel="prefetch" href="/assets/js/105.c82addea.js"><link rel="prefetch" href="/assets/js/106.d95539e1.js"><link rel="prefetch" href="/assets/js/107.3a8e4204.js"><link rel="prefetch" href="/assets/js/108.445910dc.js"><link rel="prefetch" href="/assets/js/109.e592a10a.js"><link rel="prefetch" href="/assets/js/11.1a825151.js"><link rel="prefetch" href="/assets/js/110.f2ff7f26.js"><link rel="prefetch" href="/assets/js/111.ce7b4bb8.js"><link rel="prefetch" href="/assets/js/112.c0fb665c.js"><link rel="prefetch" href="/assets/js/113.27feecaf.js"><link rel="prefetch" href="/assets/js/114.4610bfa2.js"><link rel="prefetch" href="/assets/js/115.0857c1d6.js"><link rel="prefetch" href="/assets/js/116.530d568b.js"><link rel="prefetch" href="/assets/js/117.9deade83.js"><link rel="prefetch" href="/assets/js/118.cbb62265.js"><link rel="prefetch" href="/assets/js/119.8822d43b.js"><link rel="prefetch" href="/assets/js/12.4679de68.js"><link rel="prefetch" href="/assets/js/120.355ddd53.js"><link rel="prefetch" href="/assets/js/121.94505f4a.js"><link rel="prefetch" href="/assets/js/122.6c825584.js"><link rel="prefetch" href="/assets/js/123.d2965d60.js"><link rel="prefetch" href="/assets/js/124.bb17af3e.js"><link rel="prefetch" href="/assets/js/125.a523475b.js"><link rel="prefetch" href="/assets/js/126.309eb2a0.js"><link rel="prefetch" href="/assets/js/127.31f131d5.js"><link rel="prefetch" href="/assets/js/128.d6961094.js"><link rel="prefetch" href="/assets/js/129.9f80c586.js"><link rel="prefetch" href="/assets/js/13.821d2576.js"><link rel="prefetch" href="/assets/js/130.8b3034e2.js"><link rel="prefetch" href="/assets/js/131.5c952a0b.js"><link rel="prefetch" href="/assets/js/132.9b312915.js"><link rel="prefetch" href="/assets/js/133.229545d4.js"><link rel="prefetch" href="/assets/js/134.6ef84d4d.js"><link rel="prefetch" href="/assets/js/135.63dcccc3.js"><link rel="prefetch" href="/assets/js/136.693bbb9e.js"><link rel="prefetch" href="/assets/js/137.065787a2.js"><link rel="prefetch" href="/assets/js/138.199d56aa.js"><link rel="prefetch" href="/assets/js/139.93368911.js"><link rel="prefetch" href="/assets/js/14.f2409887.js"><link rel="prefetch" href="/assets/js/140.cb3339d6.js"><link rel="prefetch" href="/assets/js/141.0ffa040d.js"><link rel="prefetch" href="/assets/js/142.c3e197d4.js"><link rel="prefetch" href="/assets/js/143.9e4dc6ae.js"><link rel="prefetch" href="/assets/js/144.27249482.js"><link rel="prefetch" href="/assets/js/145.f9305e04.js"><link rel="prefetch" href="/assets/js/146.a953796c.js"><link rel="prefetch" href="/assets/js/147.5ffa8a4e.js"><link rel="prefetch" href="/assets/js/148.5f5c0ad8.js"><link rel="prefetch" href="/assets/js/149.6690aae1.js"><link rel="prefetch" href="/assets/js/15.9354febe.js"><link rel="prefetch" href="/assets/js/150.36dae2d3.js"><link rel="prefetch" href="/assets/js/151.2ca29374.js"><link rel="prefetch" href="/assets/js/152.fceb9b61.js"><link rel="prefetch" href="/assets/js/153.93489dbc.js"><link rel="prefetch" href="/assets/js/154.d9c14ff8.js"><link rel="prefetch" href="/assets/js/155.b6eec7f7.js"><link rel="prefetch" href="/assets/js/156.8718f8bc.js"><link rel="prefetch" href="/assets/js/157.8484231e.js"><link rel="prefetch" href="/assets/js/158.d1755131.js"><link rel="prefetch" href="/assets/js/159.8a8be7d5.js"><link rel="prefetch" href="/assets/js/16.590590ab.js"><link rel="prefetch" href="/assets/js/160.67e2efd2.js"><link rel="prefetch" href="/assets/js/161.0e22ffff.js"><link rel="prefetch" href="/assets/js/162.f47c5fdc.js"><link rel="prefetch" href="/assets/js/163.da74b426.js"><link rel="prefetch" href="/assets/js/164.f88f06d5.js"><link rel="prefetch" href="/assets/js/165.9a1b5b41.js"><link rel="prefetch" href="/assets/js/167.ff58fb1f.js"><link rel="prefetch" href="/assets/js/168.9a351c30.js"><link rel="prefetch" href="/assets/js/169.23c06c42.js"><link rel="prefetch" href="/assets/js/17.4cb5664d.js"><link rel="prefetch" href="/assets/js/170.ea0af6cf.js"><link rel="prefetch" href="/assets/js/171.e11e1bb7.js"><link rel="prefetch" href="/assets/js/172.273f4d56.js"><link rel="prefetch" href="/assets/js/173.fca03089.js"><link rel="prefetch" href="/assets/js/174.434334ff.js"><link rel="prefetch" href="/assets/js/175.a8acb6b2.js"><link rel="prefetch" href="/assets/js/176.a1c55473.js"><link rel="prefetch" href="/assets/js/177.ebb38cec.js"><link rel="prefetch" href="/assets/js/178.79b8a327.js"><link rel="prefetch" href="/assets/js/179.6319af14.js"><link rel="prefetch" href="/assets/js/18.f5fe433e.js"><link rel="prefetch" href="/assets/js/180.28a1d783.js"><link rel="prefetch" href="/assets/js/181.a29f39c5.js"><link rel="prefetch" href="/assets/js/182.9f3d9c76.js"><link rel="prefetch" href="/assets/js/183.338ae9a8.js"><link rel="prefetch" href="/assets/js/184.18c28159.js"><link rel="prefetch" href="/assets/js/185.05381100.js"><link rel="prefetch" href="/assets/js/186.ce9412eb.js"><link rel="prefetch" href="/assets/js/187.30a80942.js"><link rel="prefetch" href="/assets/js/188.5a77f986.js"><link rel="prefetch" href="/assets/js/189.f34dc967.js"><link rel="prefetch" href="/assets/js/19.d02f7224.js"><link rel="prefetch" href="/assets/js/190.d9762047.js"><link rel="prefetch" href="/assets/js/191.8c52689f.js"><link rel="prefetch" href="/assets/js/192.10ae9786.js"><link rel="prefetch" href="/assets/js/193.4a83ff5f.js"><link rel="prefetch" href="/assets/js/194.1d9f888b.js"><link rel="prefetch" href="/assets/js/195.ac95d80c.js"><link rel="prefetch" href="/assets/js/196.305a7cc8.js"><link rel="prefetch" href="/assets/js/197.3950b155.js"><link rel="prefetch" href="/assets/js/198.60367e76.js"><link rel="prefetch" href="/assets/js/199.a5eec1cf.js"><link rel="prefetch" href="/assets/js/20.02900ba2.js"><link rel="prefetch" href="/assets/js/200.7b42f970.js"><link rel="prefetch" href="/assets/js/201.c176b7b8.js"><link rel="prefetch" href="/assets/js/202.eb6989b5.js"><link rel="prefetch" href="/assets/js/203.77522ed7.js"><link rel="prefetch" href="/assets/js/204.d5e4c11b.js"><link rel="prefetch" href="/assets/js/205.b174d51b.js"><link rel="prefetch" href="/assets/js/206.4c489028.js"><link rel="prefetch" href="/assets/js/207.afdf032a.js"><link rel="prefetch" href="/assets/js/208.e5a0bdd5.js"><link rel="prefetch" href="/assets/js/209.67c9cab8.js"><link rel="prefetch" href="/assets/js/21.3b6ef7f6.js"><link rel="prefetch" href="/assets/js/210.99085605.js"><link rel="prefetch" href="/assets/js/211.62045ced.js"><link rel="prefetch" href="/assets/js/212.5d4b9b33.js"><link rel="prefetch" href="/assets/js/213.8d2fc243.js"><link rel="prefetch" href="/assets/js/214.081b8259.js"><link rel="prefetch" href="/assets/js/215.a9c42b7b.js"><link rel="prefetch" href="/assets/js/216.e4177064.js"><link rel="prefetch" href="/assets/js/217.00d389be.js"><link rel="prefetch" href="/assets/js/218.53691557.js"><link rel="prefetch" href="/assets/js/219.fce8476d.js"><link rel="prefetch" href="/assets/js/22.ab7a2af8.js"><link rel="prefetch" href="/assets/js/220.8ca717ad.js"><link rel="prefetch" href="/assets/js/221.b774095e.js"><link rel="prefetch" href="/assets/js/222.abb49f0a.js"><link rel="prefetch" href="/assets/js/223.506eb112.js"><link rel="prefetch" href="/assets/js/224.7e33133f.js"><link rel="prefetch" href="/assets/js/225.4443cf9b.js"><link rel="prefetch" href="/assets/js/226.5d64564f.js"><link rel="prefetch" href="/assets/js/227.e647cf42.js"><link rel="prefetch" href="/assets/js/228.7b8e1561.js"><link rel="prefetch" href="/assets/js/229.c6b936b3.js"><link rel="prefetch" href="/assets/js/23.b428286f.js"><link rel="prefetch" href="/assets/js/230.484dfbbc.js"><link rel="prefetch" href="/assets/js/231.04cb07f3.js"><link rel="prefetch" href="/assets/js/232.cb5f7cf4.js"><link rel="prefetch" href="/assets/js/233.fd5563aa.js"><link rel="prefetch" href="/assets/js/234.bf0c8bd7.js"><link rel="prefetch" href="/assets/js/235.c910d0ff.js"><link rel="prefetch" href="/assets/js/236.2fa96a32.js"><link rel="prefetch" href="/assets/js/237.4d40bac8.js"><link rel="prefetch" href="/assets/js/238.8f8a5f39.js"><link rel="prefetch" href="/assets/js/239.8c8e2f64.js"><link rel="prefetch" href="/assets/js/24.a3749d36.js"><link rel="prefetch" href="/assets/js/240.b662bcd8.js"><link rel="prefetch" href="/assets/js/241.04b9e3ed.js"><link rel="prefetch" href="/assets/js/242.bae1b833.js"><link rel="prefetch" href="/assets/js/243.174da90a.js"><link rel="prefetch" href="/assets/js/244.1ad856fc.js"><link rel="prefetch" href="/assets/js/245.a622849c.js"><link rel="prefetch" href="/assets/js/246.dc04cc61.js"><link rel="prefetch" href="/assets/js/247.d9f48a2f.js"><link rel="prefetch" href="/assets/js/248.85018b5a.js"><link rel="prefetch" href="/assets/js/249.6ba9e6c7.js"><link rel="prefetch" href="/assets/js/25.bc6a97e8.js"><link rel="prefetch" href="/assets/js/250.9ca65c13.js"><link rel="prefetch" href="/assets/js/251.8f4abe5e.js"><link rel="prefetch" href="/assets/js/252.cb8b4901.js"><link rel="prefetch" href="/assets/js/253.e43c464a.js"><link rel="prefetch" href="/assets/js/254.bc5748be.js"><link rel="prefetch" href="/assets/js/255.ad9c3e74.js"><link rel="prefetch" href="/assets/js/256.48bf6b1c.js"><link rel="prefetch" href="/assets/js/257.aae9e4a7.js"><link rel="prefetch" href="/assets/js/258.d27a0224.js"><link rel="prefetch" href="/assets/js/259.8b338cff.js"><link rel="prefetch" href="/assets/js/26.81ae73cb.js"><link rel="prefetch" href="/assets/js/260.9302e533.js"><link rel="prefetch" href="/assets/js/261.ea1ed48a.js"><link rel="prefetch" href="/assets/js/262.08d81cca.js"><link rel="prefetch" href="/assets/js/263.c2598230.js"><link rel="prefetch" href="/assets/js/264.89fadf4b.js"><link rel="prefetch" href="/assets/js/265.9e7e3b87.js"><link rel="prefetch" href="/assets/js/266.63098760.js"><link rel="prefetch" href="/assets/js/267.df285aaf.js"><link rel="prefetch" href="/assets/js/268.56ef99a0.js"><link rel="prefetch" href="/assets/js/269.86c3bd00.js"><link rel="prefetch" href="/assets/js/27.5361988c.js"><link rel="prefetch" href="/assets/js/270.69d8c77d.js"><link rel="prefetch" href="/assets/js/271.49550e05.js"><link rel="prefetch" href="/assets/js/272.bf7fe25a.js"><link rel="prefetch" href="/assets/js/273.bac87430.js"><link rel="prefetch" href="/assets/js/274.1a5b6778.js"><link rel="prefetch" href="/assets/js/275.59d1fe0c.js"><link rel="prefetch" href="/assets/js/276.c21f1bb7.js"><link rel="prefetch" href="/assets/js/277.3416c059.js"><link rel="prefetch" href="/assets/js/278.1e47cbc9.js"><link rel="prefetch" href="/assets/js/279.a285ca6b.js"><link rel="prefetch" href="/assets/js/28.902cf242.js"><link rel="prefetch" href="/assets/js/280.b1cfd58b.js"><link rel="prefetch" href="/assets/js/281.5014dd8c.js"><link rel="prefetch" href="/assets/js/282.f46c3f5f.js"><link rel="prefetch" href="/assets/js/283.c8fa806b.js"><link rel="prefetch" href="/assets/js/284.1bca3237.js"><link rel="prefetch" href="/assets/js/285.ca102a1f.js"><link rel="prefetch" href="/assets/js/286.312b549d.js"><link rel="prefetch" href="/assets/js/287.56daf71d.js"><link rel="prefetch" href="/assets/js/288.4d6ee237.js"><link rel="prefetch" href="/assets/js/289.8990a52d.js"><link rel="prefetch" href="/assets/js/29.8878a84b.js"><link rel="prefetch" href="/assets/js/290.79c4d4bb.js"><link rel="prefetch" href="/assets/js/291.e39a8f59.js"><link rel="prefetch" href="/assets/js/292.09b1dbf3.js"><link rel="prefetch" href="/assets/js/293.c11758cc.js"><link rel="prefetch" href="/assets/js/294.efe1c620.js"><link rel="prefetch" href="/assets/js/295.9a4ce682.js"><link rel="prefetch" href="/assets/js/296.5d55e2b4.js"><link rel="prefetch" href="/assets/js/297.0c74b494.js"><link rel="prefetch" href="/assets/js/298.61015025.js"><link rel="prefetch" href="/assets/js/299.95b2a709.js"><link rel="prefetch" href="/assets/js/30.144a5c6c.js"><link rel="prefetch" href="/assets/js/300.1ded6f5a.js"><link rel="prefetch" href="/assets/js/301.0c60ca57.js"><link rel="prefetch" href="/assets/js/302.a4e4ce29.js"><link rel="prefetch" href="/assets/js/303.f51290d8.js"><link rel="prefetch" href="/assets/js/304.5b9d354a.js"><link rel="prefetch" href="/assets/js/305.4fc3fa36.js"><link rel="prefetch" href="/assets/js/306.d2ccf3d8.js"><link rel="prefetch" href="/assets/js/307.137ddc6c.js"><link rel="prefetch" href="/assets/js/308.d093842e.js"><link rel="prefetch" href="/assets/js/309.8d85e9c5.js"><link rel="prefetch" href="/assets/js/31.03034f21.js"><link rel="prefetch" href="/assets/js/310.610cadf2.js"><link rel="prefetch" href="/assets/js/311.3f9bc269.js"><link rel="prefetch" href="/assets/js/312.ac085561.js"><link rel="prefetch" href="/assets/js/313.39e131a4.js"><link rel="prefetch" href="/assets/js/314.62ae7afd.js"><link rel="prefetch" href="/assets/js/315.312dd0ad.js"><link rel="prefetch" href="/assets/js/316.3daa3b97.js"><link rel="prefetch" href="/assets/js/317.385cce00.js"><link rel="prefetch" href="/assets/js/318.6e75f908.js"><link rel="prefetch" href="/assets/js/319.4a8516ae.js"><link rel="prefetch" href="/assets/js/32.bad93e79.js"><link rel="prefetch" href="/assets/js/320.e6ea8799.js"><link rel="prefetch" href="/assets/js/321.c192a35e.js"><link rel="prefetch" href="/assets/js/322.c675d3fd.js"><link rel="prefetch" href="/assets/js/323.cf867cd9.js"><link rel="prefetch" href="/assets/js/324.38af9dd2.js"><link rel="prefetch" href="/assets/js/325.dd39b2de.js"><link rel="prefetch" href="/assets/js/326.b3197783.js"><link rel="prefetch" href="/assets/js/327.7ab3256f.js"><link rel="prefetch" href="/assets/js/328.a51703c6.js"><link rel="prefetch" href="/assets/js/329.d4f2f214.js"><link rel="prefetch" href="/assets/js/33.00e7d6b5.js"><link rel="prefetch" href="/assets/js/330.1fb7bbad.js"><link rel="prefetch" href="/assets/js/331.52605dbf.js"><link rel="prefetch" href="/assets/js/332.58cff2f4.js"><link rel="prefetch" href="/assets/js/333.fa7136ab.js"><link rel="prefetch" href="/assets/js/334.0de0062b.js"><link rel="prefetch" href="/assets/js/335.a5e18bb9.js"><link rel="prefetch" href="/assets/js/336.448ec9fa.js"><link rel="prefetch" href="/assets/js/337.c877f6df.js"><link rel="prefetch" href="/assets/js/338.e071e415.js"><link rel="prefetch" href="/assets/js/339.194f47f4.js"><link rel="prefetch" href="/assets/js/34.44ac5494.js"><link rel="prefetch" href="/assets/js/340.5755d00b.js"><link rel="prefetch" href="/assets/js/341.070a9aed.js"><link rel="prefetch" href="/assets/js/342.35edcb5e.js"><link rel="prefetch" href="/assets/js/343.a86abe3e.js"><link rel="prefetch" href="/assets/js/344.22456a86.js"><link rel="prefetch" href="/assets/js/345.054131fa.js"><link rel="prefetch" href="/assets/js/346.d850e5ce.js"><link rel="prefetch" href="/assets/js/347.7b8936a1.js"><link rel="prefetch" href="/assets/js/348.5ee2b670.js"><link rel="prefetch" href="/assets/js/349.f37573c7.js"><link rel="prefetch" href="/assets/js/35.7f32ce73.js"><link rel="prefetch" href="/assets/js/350.312ee288.js"><link rel="prefetch" href="/assets/js/351.aabc93dc.js"><link rel="prefetch" href="/assets/js/352.99aa4418.js"><link rel="prefetch" href="/assets/js/353.9c90d422.js"><link rel="prefetch" href="/assets/js/354.8a7c72b5.js"><link rel="prefetch" href="/assets/js/355.1008fd17.js"><link rel="prefetch" href="/assets/js/356.546f7242.js"><link rel="prefetch" href="/assets/js/357.3f84c383.js"><link rel="prefetch" href="/assets/js/358.57ab0f48.js"><link rel="prefetch" href="/assets/js/359.715ee9c0.js"><link rel="prefetch" href="/assets/js/36.d1e9d19f.js"><link rel="prefetch" href="/assets/js/360.92093399.js"><link rel="prefetch" href="/assets/js/361.8e8a2657.js"><link rel="prefetch" href="/assets/js/362.c6796915.js"><link rel="prefetch" href="/assets/js/363.e17af86a.js"><link rel="prefetch" href="/assets/js/364.6274b87c.js"><link rel="prefetch" href="/assets/js/365.211ac0fc.js"><link rel="prefetch" href="/assets/js/366.e5297f1f.js"><link rel="prefetch" href="/assets/js/367.d778a1f0.js"><link rel="prefetch" href="/assets/js/368.d55765fc.js"><link rel="prefetch" href="/assets/js/369.d357817a.js"><link rel="prefetch" href="/assets/js/37.3351af87.js"><link rel="prefetch" href="/assets/js/370.14439cd0.js"><link rel="prefetch" href="/assets/js/371.8f1680c9.js"><link rel="prefetch" href="/assets/js/372.61718293.js"><link rel="prefetch" href="/assets/js/373.4b4647e8.js"><link rel="prefetch" href="/assets/js/374.71d42042.js"><link rel="prefetch" href="/assets/js/375.e4d369f2.js"><link rel="prefetch" href="/assets/js/376.51cd667f.js"><link rel="prefetch" href="/assets/js/377.023da5c6.js"><link rel="prefetch" href="/assets/js/378.726a5f82.js"><link rel="prefetch" href="/assets/js/379.720646dc.js"><link rel="prefetch" href="/assets/js/38.2334aea2.js"><link rel="prefetch" href="/assets/js/380.4d823b98.js"><link rel="prefetch" href="/assets/js/381.bdcccbea.js"><link rel="prefetch" href="/assets/js/382.8cce8942.js"><link rel="prefetch" href="/assets/js/383.cb7d71d3.js"><link rel="prefetch" href="/assets/js/384.bf2af7c5.js"><link rel="prefetch" href="/assets/js/385.1cc639e2.js"><link rel="prefetch" href="/assets/js/386.684b64ab.js"><link rel="prefetch" href="/assets/js/387.e16f4a68.js"><link rel="prefetch" href="/assets/js/388.c9b30f3b.js"><link rel="prefetch" href="/assets/js/389.a8b0f99a.js"><link rel="prefetch" href="/assets/js/39.683bc07a.js"><link rel="prefetch" href="/assets/js/390.b43004ff.js"><link rel="prefetch" href="/assets/js/391.c316049a.js"><link rel="prefetch" href="/assets/js/392.2c559de6.js"><link rel="prefetch" href="/assets/js/393.3055fc0a.js"><link rel="prefetch" href="/assets/js/394.7585ce4c.js"><link rel="prefetch" href="/assets/js/395.6f04bac1.js"><link rel="prefetch" href="/assets/js/396.a6536f32.js"><link rel="prefetch" href="/assets/js/397.e9807e10.js"><link rel="prefetch" href="/assets/js/398.b89dcc8a.js"><link rel="prefetch" href="/assets/js/399.da459f94.js"><link rel="prefetch" href="/assets/js/4.47196852.js"><link rel="prefetch" href="/assets/js/40.f2d861cf.js"><link rel="prefetch" href="/assets/js/400.d8b3b5fd.js"><link rel="prefetch" href="/assets/js/401.4a5b409e.js"><link rel="prefetch" href="/assets/js/402.f2c8802d.js"><link rel="prefetch" href="/assets/js/403.bd98e777.js"><link rel="prefetch" href="/assets/js/404.d2dab4f7.js"><link rel="prefetch" href="/assets/js/405.f83ce379.js"><link rel="prefetch" href="/assets/js/406.69a91345.js"><link rel="prefetch" href="/assets/js/407.3bc1a860.js"><link rel="prefetch" href="/assets/js/408.8b88a93c.js"><link rel="prefetch" href="/assets/js/409.269ef2c9.js"><link rel="prefetch" href="/assets/js/41.79fbb067.js"><link rel="prefetch" href="/assets/js/410.40dc1b76.js"><link rel="prefetch" href="/assets/js/411.6679eea2.js"><link rel="prefetch" href="/assets/js/412.2cdd21ea.js"><link rel="prefetch" href="/assets/js/413.f5418356.js"><link rel="prefetch" href="/assets/js/414.ed9da9ad.js"><link rel="prefetch" href="/assets/js/415.4cd14246.js"><link rel="prefetch" href="/assets/js/416.cd80178b.js"><link rel="prefetch" href="/assets/js/417.d650a560.js"><link rel="prefetch" href="/assets/js/418.ad71cbc7.js"><link rel="prefetch" href="/assets/js/419.8e6c87c0.js"><link rel="prefetch" href="/assets/js/42.101ecd13.js"><link rel="prefetch" href="/assets/js/420.71ec69ad.js"><link rel="prefetch" href="/assets/js/421.91d6b7be.js"><link rel="prefetch" href="/assets/js/422.353f77c5.js"><link rel="prefetch" href="/assets/js/423.60ef06c0.js"><link rel="prefetch" href="/assets/js/424.2e57687c.js"><link rel="prefetch" href="/assets/js/425.9413632b.js"><link rel="prefetch" href="/assets/js/426.e1b29e8b.js"><link rel="prefetch" href="/assets/js/427.ed640a0c.js"><link rel="prefetch" href="/assets/js/428.90a9eecd.js"><link rel="prefetch" href="/assets/js/429.bcc51151.js"><link rel="prefetch" href="/assets/js/43.cf663bf1.js"><link rel="prefetch" href="/assets/js/430.d7a129bf.js"><link rel="prefetch" href="/assets/js/431.6f0b95f4.js"><link rel="prefetch" href="/assets/js/432.c9964a14.js"><link rel="prefetch" href="/assets/js/433.fb0bc3bb.js"><link rel="prefetch" href="/assets/js/434.cbb78303.js"><link rel="prefetch" href="/assets/js/435.7633d592.js"><link rel="prefetch" href="/assets/js/436.dd3d00e6.js"><link rel="prefetch" href="/assets/js/437.40a87461.js"><link rel="prefetch" href="/assets/js/438.640ceed6.js"><link rel="prefetch" href="/assets/js/439.4bc626d3.js"><link rel="prefetch" href="/assets/js/44.0e34047e.js"><link rel="prefetch" href="/assets/js/440.840fff96.js"><link rel="prefetch" href="/assets/js/441.e8e14977.js"><link rel="prefetch" href="/assets/js/442.0f0a17b6.js"><link rel="prefetch" href="/assets/js/443.44c2279e.js"><link rel="prefetch" href="/assets/js/444.6d775f58.js"><link rel="prefetch" href="/assets/js/445.dfec1767.js"><link rel="prefetch" href="/assets/js/446.8282b220.js"><link rel="prefetch" href="/assets/js/447.4b8f1a4c.js"><link rel="prefetch" href="/assets/js/448.03b53f95.js"><link rel="prefetch" href="/assets/js/449.39dea464.js"><link rel="prefetch" href="/assets/js/45.fa02a8c0.js"><link rel="prefetch" href="/assets/js/450.948c5957.js"><link rel="prefetch" href="/assets/js/451.b4e00223.js"><link rel="prefetch" href="/assets/js/452.634de921.js"><link rel="prefetch" href="/assets/js/453.957a3638.js"><link rel="prefetch" href="/assets/js/454.d410cf71.js"><link rel="prefetch" href="/assets/js/455.8c5a2163.js"><link rel="prefetch" href="/assets/js/456.877d611f.js"><link rel="prefetch" href="/assets/js/457.8b24b950.js"><link rel="prefetch" href="/assets/js/458.591d759d.js"><link rel="prefetch" href="/assets/js/459.e114c85b.js"><link rel="prefetch" href="/assets/js/46.3a265755.js"><link rel="prefetch" href="/assets/js/460.1a928144.js"><link rel="prefetch" href="/assets/js/461.2a0384d2.js"><link rel="prefetch" href="/assets/js/462.5c3649e2.js"><link rel="prefetch" href="/assets/js/463.4221227c.js"><link rel="prefetch" href="/assets/js/464.866ac902.js"><link rel="prefetch" href="/assets/js/465.05a96c32.js"><link rel="prefetch" href="/assets/js/466.3efed881.js"><link rel="prefetch" href="/assets/js/467.ddd524e5.js"><link rel="prefetch" href="/assets/js/468.9eebe3d9.js"><link rel="prefetch" href="/assets/js/469.281b53ec.js"><link rel="prefetch" href="/assets/js/47.2d120101.js"><link rel="prefetch" href="/assets/js/470.decda882.js"><link rel="prefetch" href="/assets/js/471.242be672.js"><link rel="prefetch" href="/assets/js/472.da4abae1.js"><link rel="prefetch" href="/assets/js/473.9d64ea3e.js"><link rel="prefetch" href="/assets/js/474.5362ec5b.js"><link rel="prefetch" href="/assets/js/475.6904e585.js"><link rel="prefetch" href="/assets/js/476.c460d90a.js"><link rel="prefetch" href="/assets/js/477.474813fa.js"><link rel="prefetch" href="/assets/js/478.d51e07b1.js"><link rel="prefetch" href="/assets/js/479.f0fa0689.js"><link rel="prefetch" href="/assets/js/48.57af7d42.js"><link rel="prefetch" href="/assets/js/480.8b194bbe.js"><link rel="prefetch" href="/assets/js/481.f2f1aeeb.js"><link rel="prefetch" href="/assets/js/482.6903e11b.js"><link rel="prefetch" href="/assets/js/483.65d04ad9.js"><link rel="prefetch" href="/assets/js/484.51e94629.js"><link rel="prefetch" href="/assets/js/485.415550f4.js"><link rel="prefetch" href="/assets/js/486.d24d0355.js"><link rel="prefetch" href="/assets/js/487.9eea1be6.js"><link rel="prefetch" href="/assets/js/488.eb3d4584.js"><link rel="prefetch" href="/assets/js/489.6f97c453.js"><link rel="prefetch" href="/assets/js/49.3de3d3a7.js"><link rel="prefetch" href="/assets/js/490.e83cd7f7.js"><link rel="prefetch" href="/assets/js/491.4a6acdf2.js"><link rel="prefetch" href="/assets/js/492.e0548c45.js"><link rel="prefetch" href="/assets/js/493.29b0d0b2.js"><link rel="prefetch" href="/assets/js/494.9f66922c.js"><link rel="prefetch" href="/assets/js/495.31a136ac.js"><link rel="prefetch" href="/assets/js/496.4c1f303f.js"><link rel="prefetch" href="/assets/js/497.b03e6c3f.js"><link rel="prefetch" href="/assets/js/498.a8178b3e.js"><link rel="prefetch" href="/assets/js/499.9f38526a.js"><link rel="prefetch" href="/assets/js/5.33db7f08.js"><link rel="prefetch" href="/assets/js/50.27055b53.js"><link rel="prefetch" href="/assets/js/500.262b9103.js"><link rel="prefetch" href="/assets/js/501.c97f4e75.js"><link rel="prefetch" href="/assets/js/502.5d5c5edd.js"><link rel="prefetch" href="/assets/js/503.62a2a01d.js"><link rel="prefetch" href="/assets/js/504.855415b5.js"><link rel="prefetch" href="/assets/js/505.79d4fddb.js"><link rel="prefetch" href="/assets/js/506.f2675378.js"><link rel="prefetch" href="/assets/js/507.7d811dcb.js"><link rel="prefetch" href="/assets/js/508.6c63d710.js"><link rel="prefetch" href="/assets/js/509.a6dbe871.js"><link rel="prefetch" href="/assets/js/51.82e12c0c.js"><link rel="prefetch" href="/assets/js/510.6ba536a4.js"><link rel="prefetch" href="/assets/js/511.47fcc7dd.js"><link rel="prefetch" href="/assets/js/512.f5b2b05c.js"><link rel="prefetch" href="/assets/js/513.d1a9a405.js"><link rel="prefetch" href="/assets/js/514.4768319a.js"><link rel="prefetch" href="/assets/js/515.4a7312b1.js"><link rel="prefetch" href="/assets/js/516.2a75898b.js"><link rel="prefetch" href="/assets/js/517.0734d077.js"><link rel="prefetch" href="/assets/js/518.a0affa56.js"><link rel="prefetch" href="/assets/js/519.3b143230.js"><link rel="prefetch" href="/assets/js/52.08471186.js"><link rel="prefetch" href="/assets/js/520.98088423.js"><link rel="prefetch" href="/assets/js/521.09d6f9e3.js"><link rel="prefetch" href="/assets/js/522.0a7f1cfd.js"><link rel="prefetch" href="/assets/js/523.460a682d.js"><link rel="prefetch" href="/assets/js/53.81c949e4.js"><link rel="prefetch" href="/assets/js/54.23834020.js"><link rel="prefetch" href="/assets/js/55.98bddbab.js"><link rel="prefetch" href="/assets/js/56.f33c89be.js"><link rel="prefetch" href="/assets/js/57.974b4102.js"><link rel="prefetch" href="/assets/js/58.e357e1b7.js"><link rel="prefetch" href="/assets/js/59.1cf2f460.js"><link rel="prefetch" href="/assets/js/6.d37d398a.js"><link rel="prefetch" href="/assets/js/60.bccde908.js"><link rel="prefetch" href="/assets/js/61.33679650.js"><link rel="prefetch" href="/assets/js/62.fe42a718.js"><link rel="prefetch" href="/assets/js/63.910cc28d.js"><link rel="prefetch" href="/assets/js/64.3a046b10.js"><link rel="prefetch" href="/assets/js/65.6bc58366.js"><link rel="prefetch" href="/assets/js/66.29ed3089.js"><link rel="prefetch" href="/assets/js/67.3a4a22d1.js"><link rel="prefetch" href="/assets/js/68.05fa411c.js"><link rel="prefetch" href="/assets/js/69.44dfc2db.js"><link rel="prefetch" href="/assets/js/7.8c733af6.js"><link rel="prefetch" href="/assets/js/70.059cdd51.js"><link rel="prefetch" href="/assets/js/71.d58561d2.js"><link rel="prefetch" href="/assets/js/72.056ba678.js"><link rel="prefetch" href="/assets/js/73.25916778.js"><link rel="prefetch" href="/assets/js/74.1f1823dc.js"><link rel="prefetch" href="/assets/js/75.2f5b0b73.js"><link rel="prefetch" href="/assets/js/76.06e76fe6.js"><link rel="prefetch" href="/assets/js/77.206d48bf.js"><link rel="prefetch" href="/assets/js/78.2f07e42d.js"><link rel="prefetch" href="/assets/js/79.994c527d.js"><link rel="prefetch" href="/assets/js/8.e8c4adeb.js"><link rel="prefetch" href="/assets/js/80.82c6c4f9.js"><link rel="prefetch" href="/assets/js/81.83bd28d9.js"><link rel="prefetch" href="/assets/js/82.7fbb77e1.js"><link rel="prefetch" href="/assets/js/83.e5773686.js"><link rel="prefetch" href="/assets/js/84.13db35cf.js"><link rel="prefetch" href="/assets/js/85.e6a2aa9d.js"><link rel="prefetch" href="/assets/js/86.715ac425.js"><link rel="prefetch" href="/assets/js/87.10b54644.js"><link rel="prefetch" href="/assets/js/88.477faa20.js"><link rel="prefetch" href="/assets/js/89.a562feda.js"><link rel="prefetch" href="/assets/js/9.635384b9.js"><link rel="prefetch" href="/assets/js/90.c7874d64.js"><link rel="prefetch" href="/assets/js/91.e61cbe07.js"><link rel="prefetch" href="/assets/js/92.45b11d5e.js"><link rel="prefetch" href="/assets/js/93.f587deb4.js"><link rel="prefetch" href="/assets/js/94.19940b43.js"><link rel="prefetch" href="/assets/js/95.d9763768.js"><link rel="prefetch" href="/assets/js/96.3ed0322b.js"><link rel="prefetch" href="/assets/js/97.d368e630.js"><link rel="prefetch" href="/assets/js/98.8b86b8af.js"><link rel="prefetch" href="/assets/js/99.53eb946a.js"><link rel="prefetch" href="/assets/js/vendors~docsearch.262891fb.js">
    <link rel="stylesheet" href="/assets/css/0.styles.679f71b6.css">
  </head>
  <body>
    <div id="app" data-server-rendered="true"><div class="theme-container"><header class="navbar"><div class="sidebar-button"><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" role="img" viewBox="0 0 448 512" class="icon"><path fill="currentColor" d="M436 124H12c-6.627 0-12-5.373-12-12V80c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12zm0 160H12c-6.627 0-12-5.373-12-12v-32c0-6.627 5.373-12 12-12h424c6.627 0 12 5.373 12 12v32c0 6.627-5.373 12-12 12z"></path></svg></div> <a href="/" class="home-link router-link-active"><img src="/img/logo.png" alt=" " class="logo"></a> <div class="links"><div class="search-box"><input aria-label="Search" autocomplete="off" spellcheck="false" value=""> <!----></div> <nav class="nav-links can-hide"><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Document</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/Master/Get Started/QuickStart.html" class="nav-link">In progress</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.11.x/Get Started/QuickStart.html" class="nav-link">V0.11.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.10.x/Get Started/QuickStart.html" class="nav-link">V0.10.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.9.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.9.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.8.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.8.x</a></li></ul></div></div><div class="nav-item"><a href="/SystemDesign/Architecture/Architecture.html" class="nav-link">System design</a></div><div class="nav-item"><a href="/Download/" class="nav-link">Download</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Community</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="https://cwiki.apache.org/confluence/display/iotdb" class="nav-link external">
  Wiki
  <!----></a></li><li class="dropdown-item"><!----> <a href="/Community/Community-Project Committers.html" class="nav-link">People</a></li><li class="dropdown-item"><!----> <a href="/Community/Community-Powered By.html" class="nav-link">Powered By</a></li><li class="dropdown-item"><!----> <a href="/Community/Materials.html" class="nav-link">Resources</a></li><li class="dropdown-item"><!----> <a href="/Community/Feedback.html" class="nav-link">Feedback</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Development</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/Development/VoteRelease.html" class="nav-link">How to vote</a></li><li class="dropdown-item"><!----> <a href="/Development/HowToCommit.html" class="nav-link">How to Commit</a></li><li class="dropdown-item"><!----> <a href="/Development/Committer.html" class="nav-link">Become a Committer</a></li><li class="dropdown-item"><!----> <a href="/Development/ContributeGuide.html" class="nav-link">ContributeGuide</a></li><li class="dropdown-item"><!----> <a href="/Development/format-changelist.html" class="nav-link">Changelist of TsFile</a></li><li class="dropdown-item"><!----> <a href="/Development/rpc-changelist.html" class="nav-link">Changelist of RPC</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Blog</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/Blog/Index.html" class="nav-link">Overview</a></li><li class="dropdown-item"><!----> <a href="/Blog/Release0_93.html" class="nav-link">Some Notes on Release 0.9.3 and upcoming 0.10.0</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">ASF</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="http://www.apache.org/" class="nav-link external">
  Foundation
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/licenses/" class="nav-link external">
  License
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/security/" class="nav-link external">
  Security
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/sponsorship.html" class="nav-link external">
  Sponsorship
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/thanks.html" class="nav-link external">
  Thanks
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/events/current-event" class="nav-link external">
  Current Events
  <!----></a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Languages</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/V0.11.x/Ecosystem Integration/MapReduce TsFile.html" class="nav-link">English</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.11.x/Ecosystem Integration/MapReduce TsFile.html" class="nav-link">简体中文</a></li></ul></div></div> <a href="https://github.com/apache/iotdb.git" target="_blank" rel="noopener noreferrer" class="repo-link">
    gitHub
    <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav></div></header> <div class="sidebar-mask"></div> <aside class="sidebar"><nav class="nav-links"><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Document</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/Master/Get Started/QuickStart.html" class="nav-link">In progress</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.11.x/Get Started/QuickStart.html" class="nav-link">V0.11.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.10.x/Get Started/QuickStart.html" class="nav-link">V0.10.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.9.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.9.x</a></li><li class="dropdown-item"><!----> <a href="/UserGuide/V0.8.x/0-Get Started/1-QuickStart.html" class="nav-link">V0.8.x</a></li></ul></div></div><div class="nav-item"><a href="/SystemDesign/Architecture/Architecture.html" class="nav-link">System design</a></div><div class="nav-item"><a href="/Download/" class="nav-link">Download</a></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Community</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="https://cwiki.apache.org/confluence/display/iotdb" class="nav-link external">
  Wiki
  <!----></a></li><li class="dropdown-item"><!----> <a href="/Community/Community-Project Committers.html" class="nav-link">People</a></li><li class="dropdown-item"><!----> <a href="/Community/Community-Powered By.html" class="nav-link">Powered By</a></li><li class="dropdown-item"><!----> <a href="/Community/Materials.html" class="nav-link">Resources</a></li><li class="dropdown-item"><!----> <a href="/Community/Feedback.html" class="nav-link">Feedback</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Development</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/Development/VoteRelease.html" class="nav-link">How to vote</a></li><li class="dropdown-item"><!----> <a href="/Development/HowToCommit.html" class="nav-link">How to Commit</a></li><li class="dropdown-item"><!----> <a href="/Development/Committer.html" class="nav-link">Become a Committer</a></li><li class="dropdown-item"><!----> <a href="/Development/ContributeGuide.html" class="nav-link">ContributeGuide</a></li><li class="dropdown-item"><!----> <a href="/Development/format-changelist.html" class="nav-link">Changelist of TsFile</a></li><li class="dropdown-item"><!----> <a href="/Development/rpc-changelist.html" class="nav-link">Changelist of RPC</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Blog</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/Blog/Index.html" class="nav-link">Overview</a></li><li class="dropdown-item"><!----> <a href="/Blog/Release0_93.html" class="nav-link">Some Notes on Release 0.9.3 and upcoming 0.10.0</a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">ASF</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="http://www.apache.org/" class="nav-link external">
  Foundation
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/licenses/" class="nav-link external">
  License
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/security/" class="nav-link external">
  Security
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/sponsorship.html" class="nav-link external">
  Sponsorship
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/foundation/thanks.html" class="nav-link external">
  Thanks
  <!----></a></li><li class="dropdown-item"><!----> <a href="http://www.apache.org/events/current-event" class="nav-link external">
  Current Events
  <!----></a></li></ul></div></div><div class="nav-item"><div class="dropdown-wrapper"><a class="dropdown-title"><span class="title">Languages</span> <span class="arrow right"></span></a> <ul class="nav-dropdown" style="display:none;"><li class="dropdown-item"><!----> <a href="/UserGuide/V0.11.x/Ecosystem Integration/MapReduce TsFile.html" class="nav-link">English</a></li><li class="dropdown-item"><!----> <a href="/zh/UserGuide/V0.11.x/Ecosystem Integration/MapReduce TsFile.html" class="nav-link">简体中文</a></li></ul></div></div> <a href="https://github.com/apache/iotdb.git" target="_blank" rel="noopener noreferrer" class="repo-link">
    gitHub
    <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></a></nav>  <ul class="sidebar-links"><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>IoTDB User Guide (V0.11.x)</span> <!----></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Get Started</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Overview</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Concept</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Server</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Client</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Operation Manual</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>System Tools</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading open"><span>Ecosystem Integration</span> <span class="arrow down"></span></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/UserGuide/V0.11.x/Ecosystem Integration/Grafana.html" class="sidebar-link">Grafana</a></li><li><a href="/UserGuide/V0.11.x/Ecosystem Integration/MapReduce TsFile.html" class="active sidebar-link">MapReduce TsFile</a></li><li><a href="/UserGuide/V0.11.x/Ecosystem Integration/Spark TsFile.html" class="sidebar-link">Spark TsFile</a></li><li><a href="/UserGuide/V0.11.x/Ecosystem Integration/Spark IoTDB.html" class="sidebar-link">Spark IoTDB</a></li><li><a href="/UserGuide/V0.11.x/Ecosystem Integration/Hive TsFile.html" class="sidebar-link">Hive TsFile</a></li></ul></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Architecture</span> <span class="arrow right"></span></p> <!----></section></li><li><section class="sidebar-group collapsable depth-0"><p class="sidebar-heading"><span>Comparison with TSDBs</span> <span class="arrow right"></span></p> <!----></section></li></ul> </aside> <main class="page"> <div class="content content__default"><h1 id="mapreduce-tsfile"><a href="#mapreduce-tsfile" class="header-anchor">#</a> MapReduce TsFile</h1> <h2 id="outline"><a href="#outline" class="header-anchor">#</a> Outline</h2> <ul><li>TsFile-Hadoop-Connector User Guide
<ul><li>About TsFile-Hadoop-Connector</li> <li>System Requirements</li> <li>Data Type Correspondence</li> <li>TSFInputFormat Explanation</li> <li>Examples
<ul><li>Read Example: calculate the sum</li> <li>Write Example: write the average into Tsfile</li></ul></li></ul></li></ul> <h1 id="tsfile-hadoop-connector-user-guide"><a href="#tsfile-hadoop-connector-user-guide" class="header-anchor">#</a> TsFile-Hadoop-Connector User Guide</h1> <h2 id="about-tsfile-hadoop-connector"><a href="#about-tsfile-hadoop-connector" class="header-anchor">#</a> About TsFile-Hadoop-Connector</h2> <p>TsFile-Hadoop-Connector implements the support of Hadoop for external data sources of Tsfile type. This enables users to read, write and query Tsfile by Hadoop.</p> <p>With this connector, you can</p> <ul><li>load a single TsFile, from either the local file system or hdfs, into Hadoop</li> <li>load all files in a specific directory, from either the local file system or hdfs, into hadoop</li> <li>write data from Hadoop into TsFile</li></ul> <h2 id="system-requirements"><a href="#system-requirements" class="header-anchor">#</a> System Requirements</h2> <table><thead><tr><th>Hadoop Version</th> <th>Java Version</th> <th>TsFile Version</th></tr></thead> <tbody><tr><td><code>2.7.3</code></td> <td><code>1.8</code></td> <td><code>0.11.1</code></td></tr></tbody></table> <blockquote><p>Note: For more information about how to download and use TsFile, please see the following link: https://github.com/apache/iotdb/tree/master/tsfile.</p></blockquote> <h2 id="data-type-correspondence"><a href="#data-type-correspondence" class="header-anchor">#</a> Data Type Correspondence</h2> <table><thead><tr><th>TsFile data type</th> <th>Hadoop writable</th></tr></thead> <tbody><tr><td>BOOLEAN</td> <td>BooleanWritable</td></tr> <tr><td>INT32</td> <td>IntWritable</td></tr> <tr><td>INT64</td> <td>LongWritable</td></tr> <tr><td>FLOAT</td> <td>FloatWritable</td></tr> <tr><td>DOUBLE</td> <td>DoubleWritable</td></tr> <tr><td>TEXT</td> <td>Text</td></tr></tbody></table> <h2 id="tsfinputformat-explanation"><a href="#tsfinputformat-explanation" class="header-anchor">#</a> TSFInputFormat Explanation</h2> <p>TSFInputFormat extract data from tsfile and format them into records of <code>MapWritable</code>.</p> <p>Suppose that we want to extract data of the device named <code>d1</code> which has three sensors named <code>s1</code>, <code>s2</code>, <code>s3</code>.</p> <p><code>s1</code>'s type is <code>BOOLEAN</code>, <code>s2</code>'s type is <code>DOUBLE</code>, <code>s3</code>'s type is <code>TEXT</code>.</p> <p>The <code>MapWritable</code> struct will be like:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>{
    &quot;time_stamp&quot;: 10000000,
    &quot;device_id&quot;:  d1,
    &quot;s1&quot;:         true,
    &quot;s2&quot;:         3.14,
    &quot;s3&quot;:         &quot;middle&quot;
}
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><p>In the Map job of Hadoop, you can get any value you want by key as following:</p> <p><code>mapwritable.get(new Text(&quot;s1&quot;))</code></p> <blockquote><p>Note: All keys in <code>MapWritable</code> are <code>Text</code> type.</p></blockquote> <h2 id="examples"><a href="#examples" class="header-anchor">#</a> Examples</h2> <h3 id="read-example-calculate-the-sum"><a href="#read-example-calculate-the-sum" class="header-anchor">#</a> Read Example: calculate the sum</h3> <p>First of all, we should tell InputFormat what kind of data we want from tsfile.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>    // configure reading time enable
    TSFInputFormat.setReadTime(job, true); 
    // configure reading deviceId enable
    TSFInputFormat.setReadDeviceId(job, true); 
    // configure reading which deltaObjectIds
    String[] deviceIds = {&quot;device_1&quot;};
    TSFInputFormat.setReadDeviceIds(job, deltaObjectIds);
    // configure reading which measurementIds
    String[] measurementIds = {&quot;sensor_1&quot;, &quot;sensor_2&quot;, &quot;sensor_3&quot;};
    TSFInputFormat.setReadMeasurementIds(job, measurementIds);
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div><p>And then,the output key and value of mapper and reducer should be specified</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>    // set inputformat and outputformat
    job.setInputFormatClass(TSFInputFormat.class);
    // set mapper output key and value
    job.setMapOutputKeyClass(Text.class);
    job.setMapOutputValueClass(DoubleWritable.class);
    // set reducer output key and value
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(DoubleWritable.class);
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></div></div><p>Then, the <code>mapper</code> and <code>reducer</code> class is how you deal with the <code>MapWritable</code> produced by <code>TSFInputFormat</code> class.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>  public static class TSMapper extends Mapper&lt;NullWritable, MapWritable, Text, DoubleWritable&gt; {

    @Override
    protected void map(NullWritable key, MapWritable value,
        Mapper&lt;NullWritable, MapWritable, Text, DoubleWritable&gt;.Context context)
        throws IOException, InterruptedException {

      Text deltaObjectId = (Text) value.get(new Text(&quot;device_id&quot;));
      context.write(deltaObjectId, (DoubleWritable) value.get(new Text(&quot;sensor_3&quot;)));
    }
  }

  public static class TSReducer extends Reducer&lt;Text, DoubleWritable, Text, DoubleWritable&gt; {

    @Override
    protected void reduce(Text key, Iterable&lt;DoubleWritable&gt; values,
        Reducer&lt;Text, DoubleWritable, Text, DoubleWritable&gt;.Context context)
        throws IOException, InterruptedException {

      double sum = 0;
      for (DoubleWritable value : values) {
        sum = sum + value.get();
      }
      context.write(key, new DoubleWritable(sum));
    }
  }
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br></div></div><blockquote><p>Note: For the complete code, please see the following link: https://github.com/apache/iotdb/blob/master/example/hadoop/src/main/java/org/apache/iotdb//hadoop/tsfile/TSFMRReadExample.java</p></blockquote> <h3 id="write-example-write-the-average-into-tsfile"><a href="#write-example-write-the-average-into-tsfile" class="header-anchor">#</a> Write Example: write the average into Tsfile</h3> <p>Except for the <code>OutputFormatClass</code>, the rest of configuration code for hadoop map-reduce job is almost same as above.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>   job.setOutputFormatClass(TSFOutputFormat.class);
   // set reducer output key and value
   job.setOutputKeyClass(NullWritable.class);
   job.setOutputValueClass(HDFSTSRecord.class);
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><p>Then, the <code>mapper</code> and <code>reducer</code> class is how you deal with the <code>MapWritable</code> produced by <code>TSFInputFormat</code> class.</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>    public static class TSMapper extends Mapper&lt;NullWritable, MapWritable, Text, MapWritable&gt; {
        @Override
        protected void map(NullWritable key, MapWritable value,
                           Mapper&lt;NullWritable, MapWritable, Text, MapWritable&gt;.Context context)
                throws IOException, InterruptedException {

            Text deltaObjectId = (Text) value.get(new Text(&quot;device_id&quot;));
            long timestamp = ((LongWritable)value.get(new Text(&quot;timestamp&quot;))).get();
            if (timestamp % 100000 == 0) {
                context.write(deltaObjectId, new MapWritable(value));
            }
        }
    }

    /**
     * This reducer calculate the average value.
     */
    public static class TSReducer extends Reducer&lt;Text, MapWritable, NullWritable, HDFSTSRecord&gt; {

        @Override
        protected void reduce(Text key, Iterable&lt;MapWritable&gt; values,
                              Reducer&lt;Text, MapWritable, NullWritable, HDFSTSRecord&gt;.Context context) throws IOException, InterruptedException {
            long sensor1_value_sum = 0;
            long sensor2_value_sum = 0;
            double sensor3_value_sum = 0;
            long num = 0;
            for (MapWritable value : values) {
                num++;
                sensor1_value_sum += ((LongWritable)value.get(new Text(&quot;sensor_1&quot;))).get();
                sensor2_value_sum += ((LongWritable)value.get(new Text(&quot;sensor_2&quot;))).get();
                sensor3_value_sum += ((DoubleWritable)value.get(new Text(&quot;sensor_3&quot;))).get();
            }
            HDFSTSRecord tsRecord = new HDFSTSRecord(1L, key.toString());
            DataPoint dPoint1 = new LongDataPoint(&quot;sensor_1&quot;, sensor1_value_sum / num);
            DataPoint dPoint2 = new LongDataPoint(&quot;sensor_2&quot;, sensor2_value_sum / num);
            DataPoint dPoint3 = new DoubleDataPoint(&quot;sensor_3&quot;, sensor3_value_sum / num);
            tsRecord.addTuple(dPoint1);
            tsRecord.addTuple(dPoint2);
            tsRecord.addTuple(dPoint3);
            context.write(NullWritable.get(), tsRecord);
        }
    }
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br></div></div><blockquote><p>Note: For the complete code, please see the following link: https://github.com/apache/iotdb/blob/master/example/hadoop/src/main/java/org/apache/iotdb//hadoop/tsfile/TSMRWriteExample.java</p></blockquote></div> <div class="page-nav"><p class="inner"><span class="prev">
        ←
        <a href="/UserGuide/V0.11.x/Ecosystem Integration/Grafana.html" class="prev">
          Grafana
        </a></span> <span class="next"><a href="/UserGuide/V0.11.x/Ecosystem Integration/Spark TsFile.html">
          Spark TsFile
        </a>
        →
      </span></p></div> <p style="text-align: center;">Copyright © 2020 The Apache Software Foundation.<br>
     Apache and the Apache feather logo are trademarks of The Apache Software Foundation</p> <p style="text-align: center; margin-top: 10px; color: #444">
    Contact us: Join QQ Group 659990460 | Add friend <i>tietouqiao</i> and be invited to Wechat Group<br>
    see <a href="https://github.com/apache/iotdb/issues/1995">Join the community</a> for more</p></main></div><div class="global-ui"></div></div>
    <script src="/assets/js/app.ee472f44.js" defer></script><script src="/assets/js/3.49f0f20a.js" defer></script><script src="/assets/js/166.8832a7a4.js" defer></script>
  </body>
</html>