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https://issues.apache.org/jira/browse/HBASE-5606?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13245407#comment-13245407
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stack commented on HBASE-5606:
------------------------------
ping on this patch. What we thinking here? Patch seems clean enough. Jimmy,
you think there might be other places where we need to do similar? Prakash,
what you think of Jimmy's suggestion of sync'ing the delete (I think I know
what you are going to say!).
> SplitLogManger async delete node hangs log splitting when ZK connection is
> lost
> --------------------------------------------------------------------------------
>
> Key: HBASE-5606
> URL: https://issues.apache.org/jira/browse/HBASE-5606
> Project: HBase
> Issue Type: Bug
> Components: wal
> Affects Versions: 0.92.0
> Reporter: Gopinathan A
> Priority: Critical
> Fix For: 0.92.2
>
> Attachments:
> 0001-HBASE-5606-SplitLogManger-async-delete-node-hangs-lo.patch,
> 0001-HBASE-5606-SplitLogManger-async-delete-node-hangs-lo.patch
>
>
> 1. One rs died, the servershutdownhandler found it out and started the
> distributed log splitting;
> 2. All tasks are failed due to ZK connection lost, so the all the tasks were
> deleted asynchronously;
> 3. Servershutdownhandler retried the log splitting;
> 4. The asynchronously deletion in step 2 finally happened for new task
> 5. This made the SplitLogManger in hanging state.
> This leads to .META. region not assigened for long time
> {noformat}
> hbase-root-master-HOST-192-168-47-204.log.2012-03-14"(55413,79):2012-03-14
> 19:28:47,932 DEBUG org.apache.hadoop.hbase.master.SplitLogManager: put up
> splitlog task at znode
> /hbase/splitlog/hdfs%3A%2F%2F192.168.47.205%3A9000%2Fhbase%2F.logs%2Flinux-114.site%2C60020%2C1331720381665-splitting%2Flinux-114.site%252C60020%252C1331720381665.1331752316170
> hbase-root-master-HOST-192-168-47-204.log.2012-03-14"(89303,79):2012-03-14
> 19:34:32,387 DEBUG org.apache.hadoop.hbase.master.SplitLogManager: put up
> splitlog task at znode
> /hbase/splitlog/hdfs%3A%2F%2F192.168.47.205%3A9000%2Fhbase%2F.logs%2Flinux-114.site%2C60020%2C1331720381665-splitting%2Flinux-114.site%252C60020%252C1331720381665.1331752316170
> {noformat}
> {noformat}
> hbase-root-master-HOST-192-168-47-204.log.2012-03-14"(80417,99):2012-03-14
> 19:34:31,196 DEBUG
> org.apache.hadoop.hbase.master.SplitLogManager$DeleteAsyncCallback: deleted
> /hbase/splitlog/hdfs%3A%2F%2F192.168.47.205%3A9000%2Fhbase%2F.logs%2Flinux-114.site%2C60020%2C1331720381665-splitting%2Flinux-114.site%252C60020%252C1331720381665.1331752316170
> hbase-root-master-HOST-192-168-47-204.log.2012-03-14"(89456,99):2012-03-14
> 19:34:32,497 DEBUG
> org.apache.hadoop.hbase.master.SplitLogManager$DeleteAsyncCallback: deleted
> /hbase/splitlog/hdfs%3A%2F%2F192.168.47.205%3A9000%2Fhbase%2F.logs%2Flinux-114.site%2C60020%2C1331720381665-splitting%2Flinux-114.site%252C60020%252C1331720381665.1331752316170
> {noformat}
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