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From "Liu Shaohui (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-13396) Cleanup unclosed writers in later writer rolling
Date Fri, 03 Apr 2015 13:02:52 GMT
Liu Shaohui created HBASE-13396:

             Summary: Cleanup unclosed writers in later writer rolling
                 Key: HBASE-13396
                 URL: https://issues.apache.org/jira/browse/HBASE-13396
             Project: HBase
          Issue Type: Bug
            Reporter: Liu Shaohui
            Assignee: Liu Shaohui
            Priority: Minor

Currently, the default value of hbase.regionserver.logroll.errors.tolerated is 2, which means
regionserver can tolerate two continuous failures of closing writers at most. Temporary problems
of network or namenode may cause those failures. After those failures, the hdfs clients in
RS may continue to renew the lease of the hlog of the writer and the namenode will not help
to recover the lease of this hlog. So the last block of this hlog will be RBW(replica being
written) state until the regionserver is down. Blocks in this state will block the datanode
decommission and other operations in HDFS.

So I think we need a mechanism to clean up those unclosed writers afterwards. A simple solution
is to record those unclosed writers and attempt to close these writers until success.

Discussions and suggestions are welcomed~ Thanks

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