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https://issues.apache.org/jira/browse/HBASE-13121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14353951#comment-14353951
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Hudson commented on HBASE-13121:
--------------------------------
FAILURE: Integrated in HBase-TRUNK #6226 (See
[https://builds.apache.org/job/HBase-TRUNK/6226/])
HBASE-13121 Async wal replication for region replicas and dist log replay does
not work together (enis: rev 5025d3aa91d18310fc4d738114ee2b58e48c46c2)
*
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/handler/FinishRegionRecoveringHandler.java
*
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRegionReplicaFailover.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/wal/WALPrettyPrinter.java
*
hbase-server/src/main/java/org/apache/hadoop/hbase/zookeeper/RecoveringRegionWatcher.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
*
hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/RegionReplicaReplicationEndpoint.java
*
hbase-server/src/main/java/org/apache/hadoop/hbase/replication/BaseWALEntryFilter.java
*
hbase-server/src/test/java/org/apache/hadoop/hbase/replication/regionserver/TestRegionReplicaReplicationEndpointNoMaster.java
* hbase-client/src/main/java/org/apache/hadoop/hbase/ipc/RpcClientImpl.java
*
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestHRegion.java
*
hbase-server/src/main/java/org/apache/hadoop/hbase/coordination/ZkSplitLogWorkerCoordination.java
> Async wal replication for region replicas and dist log replay does not work
> together
> ------------------------------------------------------------------------------------
>
> Key: HBASE-13121
> URL: https://issues.apache.org/jira/browse/HBASE-13121
> Project: HBase
> Issue Type: Sub-task
> Reporter: Enis Soztutar
> Assignee: Enis Soztutar
> Fix For: 2.0.0, 1.1.0
>
> Attachments: hbase-13121_v1.patch, hbase-13121_v2.patch
>
>
> We had not tested dist log replay while testing async wal replication for
> region replicas. There seems to be a couple of issues, but fixable.
> The distinction for dist log replay is that, the region will be opened for
> recovery and regular writes when a primary fails over. This causes the region
> open event marker to be written to WAL, but at this time, the region actually
> does not contain all the edits flushed (since it is still recovering). If
> secondary regions see this event, and picks up all the files in the region
> open event marker, then they can drop edits.
> The solution is:
> - Only write the region open event marker to WAL when region is out of
> recovering mode.
> - Force a flush out of recovering mode. This ensures that all data is force
> flushed in this case. Before the region open event marker is written, we
> guarantee that all data in the region is flushed, so the list of files in the
> event marker is complete.
> - Edits coming from recovery are re-written to WAL when recovery is in
> action. These edits will have a larger seqId then their "original" seqId. If
> this is the case, we do not replicate these edits to the secondary replicas.
> Since the dist log replay recovers edits out of order (coming from parallel
> replays from WAL file split tasks), this ensures that TIMELINE consistency is
> respected and edits are not seen out of order in secondaries. These edits are
> seen from secondaries via the forced flush event.
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