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Date: Sun, 11 Dec 2011 23:16:40 +0000 (UTC)
From: "Lars Hofhansl (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-5008) The clusters can't  provide
 services because Region can't flush.
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    [ https://issues.apache.org/jira/browse/HBASE-5008?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13167239#comment-13167239 ] 

Lars Hofhansl commented on HBASE-5008:
--------------------------------------

This if I understand this correctly:
# a requested flush was canceled (because of a split?), we never unset flushRequested
# from this point on every new flush request is ignored because flushRequested is already true

Change seems sensible, although I do not know this part of the code very well. Can flushRequested is never be legitimately true at this point?

                
> The clusters can't  provide services because Region can't flush.
> ----------------------------------------------------------------
>
>                 Key: HBASE-5008
>                 URL: https://issues.apache.org/jira/browse/HBASE-5008
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>            Reporter: gaojinchao
>            Priority: Blocker
>             Fix For: 0.90.6
>
>         Attachments: HBASE-5008_Branch90.patch
>
>
> Hbase version 0.90.4 + patches
> My analysis is as follows:
> //Started splitting region b24d8ccb852ff742f2a27d01b7f5853e and closed region.
> 2011-12-10 17:32:48,653 INFO org.apache.hadoop.hbase.regionserver.SplitTransaction: Starting split of region Htable_UFDR_004,09781,1323508582833.b24d8ccb852ff742f2a27d01b7f5853e.
> 2011-12-10 17:32:49,759 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Closing Htable_UFDR_004,09781,1323508582833.b24d8ccb852ff742f2a27d01b7f5853e.: disabling compactions & flushes
> 2011-12-10 17:32:49,759 INFO org.apache.hadoop.hbase.regionserver.HRegion: Running close preflush of Htable_UFDR_004,09781,1323508582833.b24d8ccb852ff742f2a27d01b7f5853e.
> //Processed a flush request and skipped , But flushRequested had set to true
> 2011-12-10 17:33:06,963 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Started memstore flush for Htable_UFDR_004,09781,1323508582833.b24d8ccb852ff742f2a27d01b7f5853e., current region memstore size 12.6m
> 2011-12-10 17:33:17,277 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Skipping flush on Htable_UFDR_004,09781,1323508582833.b24d8ccb852ff742f2a27d01b7f5853e. because closing
> //split region b24d8ccb852ff742f2a27d01b7f5853 failed and rolled back, flushRequested flag was true, So all handle was blocked 
> 2011-12-10 17:34:01,293 INFO org.apache.hadoop.hbase.regionserver.SplitTransaction: Cleaned up old failed split transaction detritus: hdfs://193.195.18.121:9000/hbase/Htable_UFDR_004/b24d8ccb852ff742f2a27d01b7f5853e/splits
> 2011-12-10 17:34:01,294 INFO org.apache.hadoop.hbase.regionserver.HRegion: Onlined Htable_UFDR_004,09781,1323508582833.b24d8ccb852ff742f2a27d01b7f5853e.; next sequenceid=15494173
> 2011-12-10 17:34:01,295 INFO org.apache.hadoop.hbase.regionserver.CompactSplitThread: Successful rollback of failed split of Htable_UFDR_004,09781,1323508582833.b24d8ccb852ff742f2a27d01b7f5853e.
> 2011-12-10 17:43:10,147 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates for 'IPC Server handler 19 on 20020' on region 
> Htable_UFDR_004,09781,1323508582833.b24d8ccb852ff742f2a27d01b7f5853e.: memstore size 384.0m is >= than blocking 384.0m size
> // All handles had been blocked. The clusters could not provide services
> 2011-12-10 17:34:01,295 INFO org.apache.hadoop.hbase.regionserver.CompactSplitThread: Successful rollback of failed split of Htable_UFDR_004,09781,1323508582833.b24d8ccb852ff742f2a27d01b7f5853e.
> 2011-12-10 17:43:10,147 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates for 'IPC Server handler 19 on 20020' on region Htable_UFDR_004,09781,1323508582833.b24d8ccb852ff742f2a27d01b7f5853e.: memstore size 384.0m is >= than blocking 384.0m size
> 2011-12-10 17:43:10,192 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates for 'IPC Server handler 34 on 20020' on region Htable_UFDR_004,09781,1323508582833.b24d8ccb852ff742f2a27d01b7f5853e.: memstore size 384.0m is >= than blocking 384.0m size
> 2011-12-10 17:43:10,193 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates for 'IPC Server handler 51 on 20020' on region Htable_UFDR_004,09781,1323508582833.b24d8ccb852ff742f2a27d01b7f5853e.: memstore size 384.0m is >= than blocking 384.0m size
> 2011-12-10 17:43:10,196 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates for 'IPC Server handler 85 on 20020' on region Htable_UFDR_004,09781,1323508582833.b24d8ccb852ff742f2a27d01b7f5853e.: memstore size 384.0m is >= than blocking 384.0m size
> 2011-12-10 17:43:10,199 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates for 'IPC Server handler 88 on 20020' on region Htable_UFDR_004,09781,1323508582833.b24d8ccb852ff742f2a27d01b7f5853e.: memstore size 384.0m is >= than blocking 384.0m size
> 2011-12-10 17:43:10,202 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates for 'IPC Server handler 44 on 20020' on region Htable_UFDR_004,09781,1323508582833.b24d8ccb852ff742f2a27d01b7f5853e.: memstore size 384.0m is >= than blocking 384.0m size
> 2011-12-10 17:43:11,663 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates for 'IPC Server handler 2 on 20020' on region Htable_UFDR_004,09781,1323508582833.b24d8ccb852ff742f2a27d01b7f5853e.: memstore size 384.0m is >= than blocking 384.0m size
> 2011-12-10 17:43:11,665 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates for 'IPC Server handler 10 on 20020' on region Htable_UFDR_004,09781,1323508582833.b24d8ccb852ff742f2a27d01b7f5853e.: memstore size 384.0m is >= than blocking 384.0m size
> 2011-12-10 17:43:11,670 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates for 'IPC Server handler 75 on 20020' on region Htable_UFDR_004,09781,1323508582833.b24d8ccb852ff742f2a27d01b7f5853e.: memstore size 384.0m is >= than blocking 384.0m size
> 2011-12-10 17:43:11,671 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates for 'IPC Server handler 98 on 20020' on region Htable_UFDR_004,09781,1323508582833.b24d8ccb852ff742f2a27d01b7f5853e.: memstore size 384.0m is >= than blocking 384.0m size
> 2011-12-10 17:43:11,680 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates for 'IPC Server handler 11 on 20020' on region 

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