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| <div class="subTitle">org.apache.hadoop.hbase.replication.regionserver</div> |
| <h2 title="Class SerialReplicationChecker" class="title">Class SerialReplicationChecker</h2> |
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| <li>org.apache.hadoop.hbase.replication.regionserver.SerialReplicationChecker</li> |
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| <pre>@InterfaceAudience.Private |
| class <a href="../../../../../../src-html/org/apache/hadoop/hbase/replication/regionserver/SerialReplicationChecker.html#line.111">SerialReplicationChecker</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"><p> |
| Helper class to determine whether we can push a given WAL entry without breaking the replication |
| order. The class is designed to per <a href="../../../../../../org/apache/hadoop/hbase/replication/regionserver/ReplicationSourceWALReader.html" title="class in org.apache.hadoop.hbase.replication.regionserver"><code>ReplicationSourceWALReader</code></a>, so not thread safe. |
| </p> |
| <p> |
| We record all the open sequence number for a region in a special family in meta, which is called |
| 'rep_barrier', so there will be a sequence of open sequence number (b1, b2, b3, ...). We call |
| [bn, bn+1) a range, and it is obvious that a region will always be on the same RS within a |
| range. |
| <p> |
| When split and merge, we will also record the parent for the generated region(s) in the special |
| family in meta. And also, we will write an extra 'open sequence number' for the parent |
| region(s), which is the max sequence id of the region plus one. |
| </p> |
| </p> |
| <p> |
| For each peer, we record the last pushed sequence id for each region. It is managed by the |
| replication storage. |
| </p> |
| <p> |
| The algorithm works like this: |
| <ol> |
| <li>Locate the sequence id we want to push in the barriers</li> |
| <li>If it is before the first barrier, we are safe to push. This usually because we enable serial |
| replication for this table after we create the table and write data into the table.</li> |
| <li>In general, if the previous range is finished, then we are safe to push. The way to determine |
| whether a range is finish is straight-forward: check whether the last pushed sequence id is equal |
| to the end barrier of the range minus 1. There are several exceptions: |
| <ul> |
| <li>If it is in the first range, we need to check whether there are parent regions. If so, we |
| need to make sure that the data for parent regions have all been pushed.</li> |
| <li>If it is in the last range, we need to check the region state. If state is OPENING, then we |
| are not safe to push. This is because that, before we call reportRIT to master which update the |
| open sequence number into meta table, we will write a open region event marker to WAL first, and |
| its sequence id is greater than the newest open sequence number(which has not been updated to |
| meta table yet so we do not know). For this scenario, the WAL entry for this open region event |
| marker actually belongs to the range after the 'last' range, so we are not safe to push it. |
| Otherwise the last pushed sequence id will be updated to this value and then we think the |
| previous range has already been finished, but this is not true.</li> |
| <li>Notice that the above two exceptions are not conflicts, since the first range can also be the |
| last range if we only have one range.</li> |
| </ul> |
| </li> |
| </ol> |
| </p> |
| <p> |
| And for performance reason, we do not want to check meta for every WAL entry, so we introduce two |
| in memory maps. The idea is simple: |
| <ul> |
| <li>If a range can be pushed, then put its end barrier into the <code>canPushUnder</code> map.</li> |
| <li>Before accessing meta, first check the sequence id stored in the <code>canPushUnder</code> map. If |
| the sequence id of WAL entry is less the one stored in <code>canPushUnder</code> map, then we are safe |
| to push.</li> |
| </ul> |
| And for the last range, we do not have an end barrier, so we use the continuity of sequence id to |
| determine whether we can push. The rule is: |
| <ul> |
| <li>When an entry is able to push, then put its sequence id into the <code>pushed</code> map.</li> |
| <li>Check if the sequence id of WAL entry equals to the one stored in the <code>pushed</code> map plus |
| one. If so, we are safe to push, and also update the <code>pushed</code> map with the sequence id of |
| the WAL entry.</li> |
| </ul> |
| </p></div> |
| </li> |
| </ul> |
| </div> |
| <div class="summary"> |
| <ul class="blockList"> |
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| <!-- =========== FIELD SUMMARY =========== --> |
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| <h3>Field Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Field Summary table, listing fields, and an explanation"> |
| <caption><span>Fields</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <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 org.apache.hbase.thirdparty.com.google.common.cache.Cache<<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="https://docs.oracle.com/javase/8/docs/api/java/lang/Long.html?is-external=true" title="class or interface in java.lang">Long</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/replication/regionserver/SerialReplicationChecker.html#canPushUnder">canPushUnder</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/client/Connection.html" title="interface in org.apache.hadoop.hbase.client">Connection</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/replication/regionserver/SerialReplicationChecker.html#conn">conn</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/replication/regionserver/SerialReplicationChecker.html#LOG">LOG</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <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/replication/regionserver/SerialReplicationChecker.html#peerId">peerId</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private org.apache.hbase.thirdparty.com.google.common.cache.LoadingCache<<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>,org.apache.commons.lang3.mutable.MutableLong></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/replication/regionserver/SerialReplicationChecker.html#pushed">pushed</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/replication/regionserver/SerialReplicationChecker.html#REPLICATION_SERIALLY_WAITING_DEFAULT">REPLICATION_SERIALLY_WAITING_DEFAULT</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/replication/regionserver/SerialReplicationChecker.html#REPLICATION_SERIALLY_WAITING_KEY">REPLICATION_SERIALLY_WAITING_KEY</a></span></code> </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>private <a href="../../../../../../org/apache/hadoop/hbase/replication/ReplicationQueueStorage.html" title="interface in org.apache.hadoop.hbase.replication">ReplicationQueueStorage</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/replication/regionserver/SerialReplicationChecker.html#storage">storage</a></span></code> </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>private long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/replication/regionserver/SerialReplicationChecker.html#waitTimeMs">waitTimeMs</a></span></code> </td> |
| </tr> |
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| </a> |
| <h3>Constructor Summary</h3> |
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| <caption><span>Constructors</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/replication/regionserver/SerialReplicationChecker.html#SerialReplicationChecker-org.apache.hadoop.conf.Configuration-org.apache.hadoop.hbase.replication.regionserver.ReplicationSource-">SerialReplicationChecker</a></span>(org.apache.hadoop.conf.Configuration conf, |
| <a href="../../../../../../org/apache/hadoop/hbase/replication/regionserver/ReplicationSource.html" title="class in org.apache.hadoop.hbase.replication.regionserver">ReplicationSource</a> source)</code> </td> |
| </tr> |
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| <h3>Method Summary</h3> |
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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>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/replication/regionserver/SerialReplicationChecker.html#canPush-org.apache.hadoop.hbase.wal.WAL.Entry-byte:A-">canPush</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/wal/WAL.Entry.html" title="class in org.apache.hadoop.hbase.wal">WAL.Entry</a> entry, |
| byte[] row)</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/replication/regionserver/SerialReplicationChecker.html#canPush-org.apache.hadoop.hbase.wal.WAL.Entry-org.apache.hadoop.hbase.Cell-">canPush</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/wal/WAL.Entry.html" title="class in org.apache.hadoop.hbase.wal">WAL.Entry</a> entry, |
| <a href="../../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a> firstCellInEdit)</code> </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/replication/regionserver/SerialReplicationChecker.html#isLastRangeAndOpening-org.apache.hadoop.hbase.replication.ReplicationBarrierFamilyFormat.ReplicationBarrierResult-int-">isLastRangeAndOpening</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/replication/ReplicationBarrierFamilyFormat.ReplicationBarrierResult.html" title="class in org.apache.hadoop.hbase.replication">ReplicationBarrierFamilyFormat.ReplicationBarrierResult</a> barrierResult, |
| int index)</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/replication/regionserver/SerialReplicationChecker.html#isParentFinished-byte:A-">isParentFinished</a></span>(byte[] regionName)</code> </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>private boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/replication/regionserver/SerialReplicationChecker.html#isRangeFinished-long-java.lang.String-">isRangeFinished</a></span>(long endBarrier, |
| <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> encodedRegionName)</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>private void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/hbase/replication/regionserver/SerialReplicationChecker.html#recordCanPush-java.lang.String-long-long:A-int-">recordCanPush</a></span>(<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> encodedNameAsString, |
| long seqId, |
| long[] barriers, |
| int index)</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/replication/regionserver/SerialReplicationChecker.html#waitUntilCanPush-org.apache.hadoop.hbase.wal.WAL.Entry-org.apache.hadoop.hbase.Cell-">waitUntilCanPush</a></span>(<a href="../../../../../../org/apache/hadoop/hbase/wal/WAL.Entry.html" title="class in org.apache.hadoop.hbase.wal">WAL.Entry</a> entry, |
| <a href="../../../../../../org/apache/hadoop/hbase/Cell.html" title="interface in org.apache.hadoop.hbase">Cell</a> firstCellInEdit)</code> </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a name="methods.inherited.from.class.java.lang.Object"> |
| <!-- --> |
| </a> |
| <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#toString--" title="class or interface in java.lang">toString</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> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ FIELD DETAIL =========== --> |
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| </a> |
| <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/replication/regionserver/SerialReplicationChecker.html#line.113">LOG</a></pre> |
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| </a> |
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| <li class="blockList"> |
| <h4>REPLICATION_SERIALLY_WAITING_KEY</h4> |
| <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/replication/regionserver/SerialReplicationChecker.html#line.115">REPLICATION_SERIALLY_WAITING_KEY</a></pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../constant-values.html#org.apache.hadoop.hbase.replication.regionserver.SerialReplicationChecker.REPLICATION_SERIALLY_WAITING_KEY">Constant Field Values</a></dd> |
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| <a name="REPLICATION_SERIALLY_WAITING_DEFAULT"> |
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| <h4>REPLICATION_SERIALLY_WAITING_DEFAULT</h4> |
| <pre>public static final long <a href="../../../../../../src-html/org/apache/hadoop/hbase/replication/regionserver/SerialReplicationChecker.html#line.117">REPLICATION_SERIALLY_WAITING_DEFAULT</a></pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../constant-values.html#org.apache.hadoop.hbase.replication.regionserver.SerialReplicationChecker.REPLICATION_SERIALLY_WAITING_DEFAULT">Constant Field Values</a></dd> |
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| <a name="peerId"> |
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