| Title: Apache Accumulo Batch Writing and Scanning Example |
| Notice: Licensed to the Apache Software Foundation (ASF) under one |
| or more contributor license agreements. See the NOTICE file |
| distributed with this work for additional information |
| regarding copyright ownership. The ASF licenses this file |
| to you under the Apache License, Version 2.0 (the |
| "License"); you may not use this file except in compliance |
| with the License. You may obtain a copy of the License at |
| . |
| http://www.apache.org/licenses/LICENSE-2.0 |
| . |
| Unless required by applicable law or agreed to in writing, |
| software distributed under the License is distributed on an |
| "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| KIND, either express or implied. See the License for the |
| specific language governing permissions and limitations |
| under the License. |
| |
| This tutorial uses the following Java classes, which can be found in org.apache.accumulo.examples.simple.client in the examples-simple module: |
| |
| * SequentialBatchWriter.java - writes mutations with sequential rows and random values |
| * RandomBatchWriter.java - used by SequentialBatchWriter to generate random values |
| * RandomBatchScanner.java - reads random rows and verifies their values |
| |
| This is an example of how to use the batch writer and batch scanner. To compile |
| the example, run maven and copy the produced jar into the accumulo lib dir. |
| This is already done in the tar distribution. |
| |
| Below are commands that add 10000 entries to accumulo and then do 100 random |
| queries. The write command generates random 50 byte values. |
| |
| Be sure to use the name of your instance (given as instance here) and the appropriate |
| list of zookeeper nodes (given as zookeepers here). |
| |
| Before you run this, you must ensure that the user you are running has the |
| "exampleVis" authorization. (you can set this in the shell with "setauths -u username -s exampleVis") |
| |
| $ ./bin/accumulo shell -u root -e "setauths -u username -s exampleVis" |
| |
| You must also create the table, batchtest1, ahead of time. (In the shell, use "createtable batchtest1") |
| |
| $ ./bin/accumulo shell -u username -e "createtable batchtest1" |
| $ ./bin/accumulo org.apache.accumulo.examples.simple.client.SequentialBatchWriter -i instance -z zookeepers -u username -p password -t batchtest1 --start 0 --num 10000 --size 50 --batchMemory 20M --batchLatency 500 --batchThreads 20 --vis exampleVis |
| $ ./bin/accumulo org.apache.accumulo.examples.simple.client.RandomBatchScanner -i instance -z zookeepers -u username -p password -t batchtest1 --num 100 --min 0 --max 10000 --size 50 --scanThreads 20 --auths exampleVis |
| 07 11:33:11,103 [client.CountingVerifyingReceiver] INFO : Generating 100 random queries... |
| 07 11:33:11,112 [client.CountingVerifyingReceiver] INFO : finished |
| 07 11:33:11,260 [client.CountingVerifyingReceiver] INFO : 694.44 lookups/sec 0.14 secs |
| |
| 07 11:33:11,260 [client.CountingVerifyingReceiver] INFO : num results : 100 |
| |
| 07 11:33:11,364 [client.CountingVerifyingReceiver] INFO : Generating 100 random queries... |
| 07 11:33:11,370 [client.CountingVerifyingReceiver] INFO : finished |
| 07 11:33:11,416 [client.CountingVerifyingReceiver] INFO : 2173.91 lookups/sec 0.05 secs |
| |
| 07 11:33:11,416 [client.CountingVerifyingReceiver] INFO : num results : 100 |