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https://issues.apache.org/jira/browse/HADOOP-2311?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12558025#action_12558025
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Jim Kellerman commented on HADOOP-2311:
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Have we seen any more occurrences of this problem?
If not should we close this issue as not reproducable and open a new one if it
should happen again?
> [hbase] Could not complete hdfs write out to flush file forcing regionserver
> restart
> ------------------------------------------------------------------------------------
>
> Key: HADOOP-2311
> URL: https://issues.apache.org/jira/browse/HADOOP-2311
> Project: Hadoop
> Issue Type: Bug
> Components: contrib/hbase
> Reporter: stack
> Priority: Critical
> Attachments: delete-logging.patch
>
>
> I've spent some time looking into this issue but there are not enough clues
> in the logs to tell where the problem is. Here's what I know.
> Two region servers went down last night, a minute apart, during Paul Saab's
> 6hr run inserting 300million rows into hbase. The regionservers went down to
> force rerun of hlog and avoid possible data loss after a failure writing
> memory flushes to hdfs.
> Here is the lead up to the failed flush:
> ...
> 2007-11-28 22:40:02,231 INFO hbase.HRegionServer - MSG_REGION_OPEN :
> regionname: postlog,img149/4699/133lm0.jpg,1196318393738, startKey:
> <img149/4699/133lm0.jpg>, tableDesc: {name: postlog, families:
> {cookie:={name: cookie, max versions: 1, compression: NONE, in memory: false,
> max length: 2147483647, bloom filter: none}, ip:={name: ip, max versions: 1,
> compression: NONE, in memory: false, max length: 2147483647, bloom filter:
> none}}}
> 2007-11-28 22:40:02,242 DEBUG hbase.HStore - starting 1703405830/cookie (no
> reconstruction log)
> 2007-11-28 22:40:02,741 DEBUG hbase.HStore - maximum sequence id for hstore
> 1703405830/cookie is 29077708
> 2007-11-28 22:40:03,094 DEBUG hbase.HStore - starting 1703405830/ip (no
> reconstruction log)
> 2007-11-28 22:40:03,852 DEBUG hbase.HStore - maximum sequence id for hstore
> 1703405830/ip is 29077708
> 2007-11-28 22:40:04,138 DEBUG hbase.HRegion - Next sequence id for region
> postlog,img149/4699/133lm0.jpg,1196318393738 is 29077709
> 2007-11-28 22:40:04,141 INFO hbase.HRegion - region
> postlog,img149/4699/133lm0.jpg,1196318393738 available
> 2007-11-28 22:40:04,141 DEBUG hbase.HLog - changing sequence number from
> 21357623 to 29077709
> 2007-11-28 22:40:04,141 INFO hbase.HRegionServer - MSG_REGION_OPEN :
> regionname: postlog,img149/7512/dscn4444lightenedfi3.jpg,1196318393739,
> startKey: <img149/7512/dscn4444lightenedfi3.jpg>, tableDesc: {name: postlog,
> families: {cookie:={name: cookie, max versions: 1, compression: NONE, in
> memory: false, max length: 2147483647, bloom filter: none}, ip:={name: ip,
> max versions: 1, compression: NONE, in memory: false, max length: 2147483647,
> bloom filter: none}}}
> 2007-11-28 22:40:04,145 DEBUG hbase.HStore - starting 376748222/cookie (no
> reconstruction log)
> 2007-11-28 22:40:04,223 DEBUG hbase.HStore - maximum sequence id for hstore
> 376748222/cookie is 29077708
> 2007-11-28 22:40:04,277 DEBUG hbase.HStore - starting 376748222/ip (no
> reconstruction log)
> 2007-11-28 22:40:04,353 DEBUG hbase.HStore - maximum sequence id for hstore
> 376748222/ip is 29077708
> 2007-11-28 22:40:04,699 DEBUG hbase.HRegion - Next sequence id for region
> postlog,img149/7512/dscn4444lightenedfi3.jpg,1196318393739 is 29077709
> 2007-11-28 22:40:04,701 INFO hbase.HRegion - region
> postlog,img149/7512/dscn4444lightenedfi3.jpg,1196318393739 available
> 2007-11-28 22:40:34,427 DEBUG hbase.HRegionServer - flushing region
> postlog,img143/1310/yashrk3.jpg,1196317258704
> 2007-11-28 22:40:34,428 DEBUG hbase.HRegion - Not flushing cache for region
> postlog,img143/1310/yashrk3.jpg,1196317258704: snapshotMemcaches() determined
> that there was nothing to do
> 2007-11-28 22:40:55,745 DEBUG hbase.HRegionServer - flushing region
> postlog,img142/8773/1001417zc4.jpg,1196317258703
> 2007-11-28 22:40:55,745 DEBUG hbase.HRegion - Not flushing cache for region
> postlog,img142/8773/1001417zc4.jpg,1196317258703: snapshotMemcaches()
> determined that there was nothing to do
> 2007-11-28 22:41:04,144 DEBUG hbase.HRegionServer - flushing region
> postlog,img149/4699/133lm0.jpg,1196318393738
> 2007-11-28 22:41:04,144 DEBUG hbase.HRegion - Started memcache flush for
> region postlog,img149/4699/133lm0.jpg,1196318393738. Size 74.7k
> 2007-11-28 22:41:04,764 DEBUG hbase.HStore - Added
> 1703405830/ip/610047924323344967 with sequence id 29081563 and size 53.8k
> 2007-11-28 22:41:04,902 DEBUG hbase.HStore - Added
> 1703405830/cookie/3147798053949544972 with sequence id 29081563 and size 41.3k
> 2007-11-28 22:41:04,902 DEBUG hbase.HRegion - Finished memcache flush for
> region postlog,img149/4699/133lm0.jpg,1196318393738 in 758ms,
> sequenceid=29081563
> 2007-11-28 22:41:04,902 DEBUG hbase.HStore - compaction for HStore
> postlog,img149/4699/133lm0.jpg,1196318393738/ip needed.
> 2007-11-28 22:41:04,903 DEBUG hbase.HRegion - 1703405830/ip needs compaction
> 2007-11-28 22:41:04,903 INFO hbase.HRegion - starting compaction on region
> postlog,img149/4699/133lm0.jpg,1196318393738
> 2007-11-28 22:41:04,903 DEBUG hbase.HStore - started compaction of 4 files in
> /hbase/compaction.dir/hregion_1703405830/ip
> 2007-11-28 22:41:04,905 DEBUG hbase.HRegionServer - flushing region
> postlog,img149/7512/dscn4444lightenedfi3.jpg,1196318393739
> 2007-11-28 22:41:04,906 DEBUG hbase.HRegion - Started memcache flush for
> region postlog,img149/7512/dscn4444lightenedfi3.jpg,1196318393739. Size 133.1k
> 2007-11-28 22:41:05,087 DEBUG hbase.HStore - Added
> 376748222/ip/8686640221458382286 with sequence id 29081604 and size 95.8k
> 2007-11-28 22:41:05,419 FATAL hbase.HRegionServer - Replay of hlog required.
> Forcing server restart
> org.apache.hadoop.hbase.DroppedSnapshotException: java.io.IOException: Could
> not complete write to file
> /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411/data by
> DFSClient_-1010714652
> at org.apache.hadoop.dfs.NameNode.complete(NameNode.java:323)
> at sun.reflect.GeneratedMethodAccessor13.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:379)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:596)
> at org.apache.hadoop.hbase.HRegion.internalFlushcache(HRegion.java:920)
> at org.apache.hadoop.hbase.HRegion.flushcache(HRegion.java:807)
> at
> org.apache.hadoop.hbase.HRegionServer$Flusher.run(HRegionServer.java:451)
> ...
> Over in the namenode, I see the following related to the deleted file:
> 2007-11-28 22:40:48,546 DEBUG dfs.StateChange - *DIR* NameNode.mkdirs:
> /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411
> 2007-11-28 22:40:48,546 DEBUG dfs.StateChange - DIR* NameSystem.mkdirs:
> /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411
> 2007-11-28 22:40:48,546 DEBUG dfs.StateChange - DIR* FSDirectory.mkdirs:
> created directory /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411
> 2007-11-28 22:40:48,552 DEBUG dfs.StateChange - *DIR* NameNode.create: file
> /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411/data for
> DFSClient_-1010714652 at XX.XX.XX.29
> 2007-11-28 22:40:48,552 DEBUG dfs.StateChange - DIR* NameSystem.startFile:
> file /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411/data for
> DFSClient_-1010714652 at XX.XX.XX.29
> 2007-11-28 22:40:48,552 DEBUG dfs.StateChange - DIR* FSDirectory.addFile:
> /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411/data is added to
> the file system
> 2007-11-28 22:40:48,552 DEBUG dfs.StateChange - DIR* NameSystem.startFile:
> add /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411/data to
> namespace for DFSClient_-1010714652
> 2007-11-28 22:40:48,557 DEBUG dfs.StateChange - *DIR* NameNode.create: file
> /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411/index for
> DFSClient_-1010714652 at XX.XX.XX.29
> 2007-11-28 22:40:48,557 DEBUG dfs.StateChange - DIR* NameSystem.startFile:
> file /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411/index for
> DFSClient_-1010714652 XX.XX.XX.29
> 2007-11-28 22:40:48,558 DEBUG dfs.StateChange - DIR* FSDirectory.addFile:
> /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411/index is added
> to the file system
> 2007-11-28 22:40:48,558 DEBUG dfs.StateChange - DIR* NameSystem.startFile:
> add /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411/index to
> namespace for DFSClient_-1010714652
> 2007-11-28 22:40:48,573 DEBUG dfs.StateChange - *BLOCK* NameNode.addBlock:
> file /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411/data for
> DFSClient_-1010714652
> 2007-11-28 22:40:48,573 DEBUG dfs.StateChange - BLOCK*
> NameSystem.getAdditionalBlock: file
> /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411/data for
> DFSClient_-1010714652
> 2007-11-28 22:40:48,573 DEBUG dfs.StateChange - DIR* FSDirectory.addFile:
> /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411/data with
> blk_-6398846109350112398 block is added to the in-memory file system
> 2007-11-28 22:40:48,573 INFO dfs.StateChange - BLOCK*
> NameSystem.allocateBlock:
> /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411/data.
> blk_-6398846109350112398
> .....
> 2007-11-28 22:40:48,717 DEBUG dfs.StateChange - *DIR* NameNode.delete:
> /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411
> 2007-11-28 22:40:48,717 DEBUG dfs.StateChange - DIR* NameSystem.delete:
> /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411
> 2007-11-28 22:40:48,717 DEBUG dfs.StateChange - DIR* FSDirectory.delete:
> /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411
> 2007-11-28 22:40:48,717 DEBUG dfs.StateChange - DIR*
> FSDirectory.unprotectedDelete:
> /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411 is removed
> ....
> 2007-11-28 22:40:48,826 DEBUG dfs.StateChange - *DIR* NameNode.complete:
> /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411/data for
> DFSClient_-1010714652
> 2007-11-28 22:40:48,826 DEBUG dfs.StateChange - DIR* NameSystem.completeFile:
> /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411/data for
> DFSClient_-1010714652
> 2007-11-28 22:40:48,827 WARN dfs.StateChange - DIR* NameSystem.completeFile:
> failed to complete
> /hbase/hregion_376748222/cookie/mapfiles/3557442410867103411/data because
> dir.getFileBlocks() is null and pendingFile is null
> Only delete I see is on compaction completion but reading code doesn't look
> like its possible for deletes to be confused.
> Will add extra logging to see if I can figure how the delete is coming about.
> (We've fixed a similar problem before when compactions were done at region
> level)
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