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https://issues.apache.org/jira/browse/HBASE-1052?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jim Kellerman updated HBASE-1052:
---------------------------------
Fix Version/s: 0.18.2
> Stopping a HRegionServer with unflushed cache causes data loss from
> org.apache.hadoop.hbase.DroppedSnapshotException
> ---------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-1052
> URL: https://issues.apache.org/jira/browse/HBASE-1052
> Project: Hadoop HBase
> Issue Type: Bug
> Components: regionserver
> Affects Versions: 0.18.0, 0.18.1
> Reporter: Cosmin Lehene
> Assignee: Jim Kellerman
> Priority: Critical
> Fix For: 0.19.0, 0.18.2
>
>
> 1. Start a Hbase cluster
> 2. Create a table t1: create 't1', {NAME => 'f1'}
> 3. Put a cell in the table: put 't1', 'r1', 'f1:', 'value'
> 4. Scan it, see it's fine
> 5. Stop the HRegionSever hosting the t1 region: hbase/bin/hbase-daemon.sh
> stop regionserver.
> 6. Watch the region being reassigned from the original HRegionServer
> 7. Scan the t1 table again. It's empty now.
> If between step 4 and step 5 the cache is flushed (e.g. Hbase cluster
> restart) no data is loss. However it means that if you stop a region server
> with dirty cache you will loose some data.
> HRegionServer log after issuing hbase-daemon.sh stop regionserver:
> 2008-12-09 06:37:46,873 INFO org.apache.hadoop.ipc.Server: IPC Server handler
> 7 on 60020: exiting
> 2008-12-09 06:37:46,873 INFO org.apache.hadoop.ipc.Server: IPC Server handler
> 8 on 60020: exiting
> 2008-12-09 06:37:46,873 INFO org.apache.hadoop.ipc.Server: IPC Server handler
> 9 on 60020: exiting
> 2008-12-09 06:37:46,873 INFO org.apache.hadoop.ipc.Server: IPC Server handler
> 0 on 60020: exiting
> 2008-12-09 06:37:46,874 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer: Stopping infoServer
> 2008-12-09 06:37:46,874 INFO org.apache.hadoop.ipc.Server: Stopping IPC
> Server Responder
> 2008-12-09 06:37:46,874 INFO org.mortbay.util.ThreadedServer: Stopping
> Acceptor ServerSocket[addr=0.0.0.0/0.0.0.0,port=0,localport=60030]
> 2008-12-09 06:37:46,886 INFO org.mortbay.http.SocketListener: Stopped
> SocketListener on 0.0.0.0:60030
> 2008-12-09 06:37:46,948 INFO org.mortbay.util.Container: Stopped
> HttpContext[/static,/static]
> 2008-12-09 06:37:47,007 INFO org.mortbay.util.Container: Stopped
> HttpContext[/logs,/logs]
> 2008-12-09 06:37:47,007 INFO org.mortbay.util.Container: Stopped [EMAIL
> PROTECTED]
> 2008-12-09 06:37:47,094 INFO org.mortbay.util.Container: Stopped
> WebApplicationContext[/,/]
> 2008-12-09 06:37:47,094 INFO org.mortbay.util.Container: Stopped [EMAIL
> PROTECTED]
> 2008-12-09 06:37:47,094 DEBUG
> org.apache.hadoop.hbase.regionserver.HRegionServer: closing region
> t1,,1228833363456
> 2008-12-09 06:37:47,094 DEBUG org.apache.hadoop.hbase.regionserver.HRegion:
> Compactions and cache flushes disabled for region t1,,1228833363456
> 2008-12-09 06:37:47,094 DEBUG org.apache.hadoop.hbase.regionserver.HRegion:
> Scanners disabled for region t1,,1228833363456
> 2008-12-09 06:37:47,094 DEBUG org.apache.hadoop.hbase.regionserver.HRegion:
> No more active scanners for region t1,,1228833363456
> 2008-12-09 06:37:47,095 DEBUG org.apache.hadoop.hbase.regionserver.HRegion:
> Updates disabled for region t1,,1228833363456
> 2008-12-09 06:37:47,095 DEBUG org.apache.hadoop.hbase.regionserver.HRegion:
> No more row locks outstanding on region t1,,1228833363456
> 2008-12-09 06:37:47,095 DEBUG org.apache.hadoop.hbase.regionserver.HRegion:
> Started memcache flush for region t1,,1228833363456. Current region memcache
> size 18.0
> 2008-12-09 06:37:47,095 INFO org.apache.hadoop.hbase.regionserver.Flusher:
> regionserver/0:0:0:0:0:0:0:0:60020.cacheFlusher exiting
> 2008-12-09 06:37:47,096 INFO org.apache.hadoop.hbase.regionserver.LogRoller:
> LogRoller exiting.
> 2008-12-09 06:37:47,096 INFO
> org.apache.hadoop.hbase.regionserver.CompactSplitThread:
> regionserver/0:0:0:0:0:0:0:0:60020.compactor exiting
> 2008-12-09 06:37:47,099 ERROR
> org.apache.hadoop.hbase.regionserver.HRegionServer: error closing region
> t1,,1228833363456
> org.apache.hadoop.hbase.DroppedSnapshotException: region: t1,,1228833363456
> at
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:1071)
> at org.apache.hadoop.hbase.regionserver.HRegion.close(HRegion.java:619)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.closeAllRegions(HRegionServer.java:951)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:459)
> at java.lang.Thread.run(Thread.java:619)
> Caused by: java.io.IOException: Filesystem closed
> at org.apache.hadoop.dfs.DFSClient.checkOpen(DFSClient.java:196)
> at org.apache.hadoop.dfs.DFSClient.getFileInfo(DFSClient.java:564)
> at
> org.apache.hadoop.dfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:390)
> at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:667)
> at
> org.apache.hadoop.hbase.regionserver.HStoreFile.<init>(HStoreFile.java:152)
> at
> org.apache.hadoop.hbase.regionserver.HStore.internalFlushCache(HStore.java:599)
> at org.apache.hadoop.hbase.regionserver.HStore.flushCache(HStore.java:577)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:1058)
> ... 4 more
> 2008-12-09 06:37:47,100 DEBUG org.apache.hadoop.hbase.regionserver.HLog:
> closing log writer in
> hdfs://h1:54310/hbase/log_10.131.237.51_1228833326838_60020
> 2008-12-09 06:37:47,101 ERROR
> org.apache.hadoop.hbase.regionserver.HRegionServer: Close and delete failed
> java.io.IOException: Filesystem closed
> at org.apache.hadoop.dfs.DFSClient.checkOpen(DFSClient.java:196)
> at org.apache.hadoop.dfs.DFSClient.access$600(DFSClient.java:59)
> at
> org.apache.hadoop.dfs.DFSClient$DFSOutputStream.closeInternal(DFSClient.java:2689)
> at
> org.apache.hadoop.dfs.DFSClient$DFSOutputStream.close(DFSClient.java:2655)
> at
> org.apache.hadoop.fs.FSDataOutputStream$PositionCache.close(FSDataOutputStream.java:59)
> at
> org.apache.hadoop.fs.FSDataOutputStream.close(FSDataOutputStream.java:79)
> at org.apache.hadoop.io.SequenceFile$Writer.close(SequenceFile.java:962)
> at org.apache.hadoop.hbase.regionserver.HLog.close(HLog.java:349)
> at org.apache.hadoop.hbase.regionserver.HLog.closeAndDelete(HLog.java:333)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:461)
> at java.lang.Thread.run(Thread.java:619)
> 2008-12-09 06:37:47,102 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer: telling master that
> region server is shutting down at: 10.131.237.51:60020
> 2008-12-09 06:37:47,104 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer: stopping server at:
> 10.131.237.51:60020
> 2008-12-09 06:37:47,882 INFO org.apache.hadoop.hbase.Leases:
> regionserver/0:0:0:0:0:0:0:0:60020.leaseChecker closing leases
> 2008-12-09 06:37:47,882 INFO org.apache.hadoop.hbase.Leases:
> regionserver/0:0:0:0:0:0:0:0:60020.leaseChecker closed leases
> 2008-12-09 06:37:54,919 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer: worker thread exiting
> 2008-12-09 06:37:54,920 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer:
> regionserver/0:0:0:0:0:0:0:0:60020 exiting
> 2008-12-09 06:37:54,920 INFO
> org.apache.hadoop.hbase.regionserver.HRegionServer: Shutdown thread complete
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