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From "zhoushuaifeng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-3821) "NOT flushing memstore for region" keep on printing for half an hour
Date Wed, 27 Apr 2011 01:55:03 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13025557#comment-13025557
] 

zhoushuaifeng commented on HBASE-3821:
--------------------------------------

Yes, the fail to split is a transitory error. It's able to flush memory successfully later.

>  "NOT flushing memstore for region" keep on printing for half an hour
> ---------------------------------------------------------------------
>
>                 Key: HBASE-3821
>                 URL: https://issues.apache.org/jira/browse/HBASE-3821
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.90.1
>            Reporter: zhoushuaifeng
>             Fix For: 0.90.3
>
>         Attachments: HBase-3821 v1.txt
>
>
> "NOT flushing memstore for region" keep on printing for half an hour in the regionserver.
Then I restart hbase. I think there may be deadlock or cycling.
> I know that when splitting region, it will doclose of region, and set writestate.writesEnabled
= false  and may run close preflush. This will make flush fail and print "NOT flushing memstore
for region". But It should be finished after a while.
> logs:
> 2011-04-18 16:28:27,960 DEBUG org.apache.hadoop.hbase.regionserver.CompactSplitThread:
Compaction requested for ufdr,,1303124043153.031f37c9c23fcab17797b06b90205610. because regionserver60020.cacheFlusher;
priority=-1, compaction queue size=1
> 2011-04-18 16:28:30,171 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Flush requested
on ufdr,,1303124043153.031f37c9c23fcab17797b06b90205610.
> 2011-04-18 16:28:30,171 WARN org.apache.hadoop.hbase.regionserver.MemStoreFlusher: Region
ufdr,,1303124043153.031f37c9c23fcab17797b06b90205610. has too many store files; delaying flush
up to 90000ms
> 2011-04-18 16:28:32,119 INFO org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogWriter:
Using syncFs -- HDFS-200
> 2011-04-18 16:28:32,285 INFO org.apache.hadoop.hbase.regionserver.wal.HLog: Roll /hbase/.logs/linux253,60020,1303123943360/linux253%3A60020.1303124206693,
entries=5226, filesize=255913736. New hlog /hbase/.logs/linux253,60020,1303123943360/linux253%3A60020.1303124311822
> 2011-04-18 16:28:32,287 DEBUG org.apache.hadoop.hbase.regionserver.wal.HLog: Found 1
hlogs to remove out of total 2; oldest outstanding sequenceid is 11037 from region 031f37c9c23fcab17797b06b90205610
> 2011-04-18 16:28:32,288 INFO org.apache.hadoop.hbase.regionserver.wal.HLog: moving old
hlog file /hbase/.logs/linux253,60020,1303123943360/linux253%3A60020.1303123945481 whose highest
sequenceid is 6052 to /hbase/.oldlogs/linux253%3A60020.1303123945481
> 2011-04-18 16:28:42,701 INFO org.apache.hadoop.hbase.regionserver.Store: Completed major
compaction of 4 file(s), new file=hdfs://10.18.52.108:9000/hbase/ufdr/031f37c9c23fcab17797b06b90205610/value/4398465741579485290,
size=281.4m; total size for store is 468.8m
> 2011-04-18 16:28:42,712 INFO org.apache.hadoop.hbase.regionserver.HRegion: completed
compaction on region ufdr,,1303124043153.031f37c9c23fcab17797b06b90205610. after 1mins, 40sec
> 2011-04-18 16:28:42,741 INFO org.apache.hadoop.hbase.regionserver.SplitTransaction: Starting
split of region ufdr,,1303124043153.031f37c9c23fcab17797b06b90205610.
> 2011-04-18 16:28:42,770 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Closing ufdr,,1303124043153.031f37c9c23fcab17797b06b90205610.:
disabling compactions & flushes
> 2011-04-18 16:28:42,770 INFO org.apache.hadoop.hbase.regionserver.HRegion: Running close
preflush of ufdr,,1303124043153.031f37c9c23fcab17797b06b90205610.
> 2011-04-18 16:28:42,771 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Started memstore
flush for ufdr,,1303124043153.031f37c9c23fcab17797b06b90205610., current region memstore size
105.6m
> 2011-04-18 16:28:42,818 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Finished
snapshotting, commencing flushing stores
> 2011-04-18 16:28:42,846 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: NOT flushing
memstore for region ufdr,,1303124043153.031f37c9c23fcab17797b06b90205610., flushing=false,
writesEnabled=false
> 2011-04-18 16:28:42,849 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Flush requested
on ufdr,,1303124043153.031f37c9c23fcab17797b06b90205610.
> 2011-04-18 16:28:42,849 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: NOT flushing
memstore for region ufdr,,1303124043153.031f37c9c23fcab17797b06b90205610., flushing=false,
writesEnabled=false ......
> 2011-04-18 17:04:08,803 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: NOT flushing
memstore for region ufdr,,1303124043153.031f37c9c23fcab17797b06b90205610., flushing=false,
writesEnabled=false
> 2011-04-18 17:04:08,803 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Flush requested
on ufdr,,1303124043153.031f37c9c23fcab17797b06b90205610.
> Mon Apr 18 17:04:24 IST 2011 Starting regionserver on linux253 ulimit -n 1024

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