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https://issues.apache.org/jira/browse/HBASE-8729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13700594#comment-13700594
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Hudson commented on HBASE-8729:
-------------------------------
Integrated in HBase-TRUNK #4216 (See
[https://builds.apache.org/job/HBase-TRUNK/4216/])
HBASE-8729: distributedLogReplay may hang during chained region server
failure (Revision 1499925)
Result = SUCCESS
jeffreyz :
Files :
*
/hbase/trunk/hbase-client/src/main/java/org/apache/hadoop/hbase/executor/EventType.java
*
/hbase/trunk/hbase-client/src/main/java/org/apache/hadoop/hbase/executor/ExecutorType.java
*
/hbase/trunk/hbase-it/src/test/java/org/apache/hadoop/hbase/IntegrationTestDataIngestWithChaosMonkey.java
*
/hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
*
/hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterFileSystem.java
*
/hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/master/handler/LogReplayHandler.java
*
/hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/master/handler/ServerShutdownHandler.java
*
/hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
*
/hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/SplitLogWorker.java
*
/hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/HLogSplitter.java
*
/hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/WALEditsReplaySink.java
> distributedLogReplay may hang during chained region server failure
> ------------------------------------------------------------------
>
> Key: HBASE-8729
> URL: https://issues.apache.org/jira/browse/HBASE-8729
> Project: HBase
> Issue Type: Bug
> Components: MTTR
> Reporter: Jeffrey Zhong
> Assignee: Jeffrey Zhong
> Fix For: 0.98.0, 0.95.2
>
> Attachments: 8729-v2.patch, hbase-8729.patch, hbase-8729-v3.patch,
> hbase-8729-v4.patch, hbase-8729-v5.patch
>
>
> In a test, half cluster(in terms of region servers) was down and some log
> replay had incurred chained RS failures(receiving RS of a log replay failed
> again).
> Since by default, we only allow 3 concurrent SSH handlers(controlled by
> {code}this.executorService.startExecutorService(ExecutorType.MASTER_SERVER_OPERATIONS,conf.getInt("hbase.master.executor.serverops.threads",
> 3));{code}).
> If all 3 SSH handlers are doing logReplay(blocking call) and one of receiving
> RS fails again then logReplay will hang because regions of the newly failed
> RS can't be re-assigned to another live RS(no ssh handler will be processed
> due to max threads setting) and existing log replay will keep routing replay
> traffic to the dead RS.
> The fix is to submit logReplay work into a separate type of executor queue in
> order not to block SSH region assignment so that logReplay can route traffic
> to a live RS after retries and move forward.
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