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| <div class="subTitle">org.apache.hadoop.hbase.regionserver.throttle</div> |
| <h2 title="Class StoreHotnessProtector" class="title">Class StoreHotnessProtector</h2> |
| </div> |
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| <ul class="inheritance"> |
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| <li>org.apache.hadoop.hbase.regionserver.throttle.StoreHotnessProtector</li> |
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| <pre>@InterfaceAudience.Private |
| public class <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#line.64">StoreHotnessProtector</a> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">StoreHotnessProtector is designed to help limit the concurrency of puts with dense columns, it |
| does best-effort to avoid exhausting all RS's handlers. When a lot of clients write requests with |
| dense (hundreds) columns to a Store at the same time, it will lead to blocking of RS because CSLM |
| degrades when concurrency goes up. It's not a kind of throttling. Throttling is user-oriented, |
| while StoreHotnessProtector is system-oriented, RS-self-protected mechanism. |
| <p> |
| There are three key parameters: |
| <p> |
| 1. parallelPutToStoreThreadLimitCheckMinColumnCount: If the amount of columns exceed this |
| threshold, the HotProtector will work, 100 by default |
| <p> |
| 2. parallelPutToStoreThreadLimit: The amount of concurrency allowed to write puts to a Store at |
| the same time. |
| <p> |
| 3. parallelPreparePutToStoreThreadLimit: The amount of concurrency allowed to |
| prepare writing puts to a Store at the same time. |
| <p> |
| Notice that our writing pipeline includes three key process: MVCC acquire, writing MemStore, and |
| WAL. Only limit the concurrency of writing puts to Store(parallelPutToStoreThreadLimit) is not |
| enough since the actual concurrency of puts may still exceed the limit when MVCC contention or |
| slow WAL sync happens. This is why parallelPreparePutToStoreThreadLimit is needed. |
| <p> |
| This protector is enabled by default and could be turned off by setting |
| hbase.region.store.parallel.put.limit to 0, supporting online configuration change.</div> |
| </li> |
| </ul> |
| </div> |
| <div class="summary"> |
| <ul class="blockList"> |
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| <!-- =========== FIELD SUMMARY =========== --> |
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| <h3>Field Summary</h3> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Field and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#DEFAULT_PARALLEL_PREPARE_PUT_STORE_MULTIPLIER">DEFAULT_PARALLEL_PREPARE_PUT_STORE_MULTIPLIER</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#DEFAULT_PARALLEL_PUT_STORE_THREADS_LIMIT">DEFAULT_PARALLEL_PUT_STORE_THREADS_LIMIT</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#DEFAULT_PARALLEL_PUT_STORE_THREADS_LIMIT_MIN_COLUMN_NUM">DEFAULT_PARALLEL_PUT_STORE_THREADS_LIMIT_MIN_COLUMN_NUM</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#FIXED_SIZE">FIXED_SIZE</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private static org.slf4j.Logger</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#LOG">LOG</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#PARALLEL_PREPARE_PUT_STORE_MULTIPLIER">PARALLEL_PREPARE_PUT_STORE_MULTIPLIER</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#PARALLEL_PUT_STORE_THREADS_LIMIT">PARALLEL_PUT_STORE_THREADS_LIMIT</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#PARALLEL_PUT_STORE_THREADS_LIMIT_MIN_COLUMN_COUNT">PARALLEL_PUT_STORE_THREADS_LIMIT_MIN_COLUMN_COUNT</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#parallelPreparePutToStoreThreadLimit">parallelPreparePutToStoreThreadLimit</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#parallelPutToStoreThreadLimit">parallelPutToStoreThreadLimit</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#parallelPutToStoreThreadLimitCheckMinColumnCount">parallelPutToStoreThreadLimitCheckMinColumnCount</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentMap.html?is-external=true" title="class or interface in java.util.concurrent">ConcurrentMap</a><byte[],<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicInteger.html?is-external=true" title="class or interface in java.util.concurrent.atomic">AtomicInteger</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#preparePutToStoreMap">preparePutToStoreMap</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/regionserver/Region.html" title="interface in org.apache.hadoop.hbase.regionserver">Region</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#region">region</a></span></code> </td> |
| </tr> |
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| <th class="colOne" scope="col">Constructor and Description</th> |
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| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#StoreHotnessProtector-org.apache.hadoop.hbase.regionserver.Region-org.apache.hadoop.conf.Configuration-">StoreHotnessProtector</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/regionserver/Region.html" title="interface in org.apache.hadoop.hbase.regionserver">Region</a> region, |
| org.apache.hadoop.conf.Configuration conf)</code> </td> |
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| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#finish-java.util.Map-">finish</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><byte[],<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>>> familyMaps)</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>(package private) <a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><byte[],<a href="https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicInteger.html?is-external=true" title="class or interface in java.util.concurrent.atomic">AtomicInteger</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#getPreparePutToStoreMap--">getPreparePutToStoreMap</a></span>()</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#init-org.apache.hadoop.conf.Configuration-">init</a></span>(org.apache.hadoop.conf.Configuration conf)</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#isEnable--">isEnable</a></span>()</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#start-java.util.Map-">start</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/Map.html?is-external=true" title="class or interface in java.util">Map</a><byte[],<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a>>> familyMaps)</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#toString--">toString</a></span>()</code> </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#update-org.apache.hadoop.conf.Configuration-">update</a></span>(org.apache.hadoop.conf.Configuration conf)</code> </td> |
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| </table> |
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| <h3>Methods inherited from class java.lang.<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3> |
| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
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| </div> |
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| <h3>Field Detail</h3> |
| <a name="LOG"> |
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| <h4>LOG</h4> |
| <pre>private static final org.slf4j.Logger <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#line.65">LOG</a></pre> |
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| <h4>parallelPutToStoreThreadLimit</h4> |
| <pre>private volatile int <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#line.66">parallelPutToStoreThreadLimit</a></pre> |
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| <pre>private volatile int <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#line.68">parallelPreparePutToStoreThreadLimit</a></pre> |
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| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../constant-values.html#org.apache.hadoop.hbase.regionserver.throttle.StoreHotnessProtector.PARALLEL_PUT_STORE_THREADS_LIMIT">Constant Field Values</a></dd> |
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| <pre>public static final <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> <a href="../../../../../../src-html/org/apache/hadoop/hbase/regionserver/throttle/StoreHotnessProtector.html#line.71">PARALLEL_PREPARE_PUT_STORE_MULTIPLIER</a></pre> |
| <dl> |
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| <dd><a href="../../../../../../constant-values.html#org.apache.hadoop.hbase.regionserver.throttle.StoreHotnessProtector.PARALLEL_PREPARE_PUT_STORE_MULTIPLIER">Constant Field Values</a></dd> |
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