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https://issues.apache.org/jira/browse/HBASE-2467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12931222#action_12931222
]
Jean-Daniel Cryans commented on HBASE-2467:
-------------------------------------------
bq. JD, have you seen that come up on recent versions?
Here's one that happened while the server was going down:
{noformat}
2010-10-29 03:11:33,017 ERROR
org.apache.hadoop.hbase.regionserver.HRegionServer:
java.io.IOException: Cannot append; log is closed
at org.apache.hadoop.hbase.regionserver.wal.HLog.append(HLog.java:840)
at org.apache.hadoop.hbase.regionserver.HRegion.put(HRegion.java:1641)
at org.apache.hadoop.hbase.regionserver.HRegion.put(HRegion.java:1261)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.put(HRegionServer.java:1777)
at sun.reflect.GeneratedMethodAccessor110.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:560)
at
org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1027)
2010-10-29 03:11:33,053 ERROR
org.apache.hadoop.hbase.regionserver.HRegionServer:
java.lang.NullPointerException
at
org.apache.hadoop.io.SequenceFile$Writer.checkAndWriteSync(SequenceFile.java:975)
at
org.apache.hadoop.io.SequenceFile$Writer.append(SequenceFile.java:1017)
at
org.apache.hadoop.io.SequenceFile$Writer.append(SequenceFile.java:984)
at
org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogWriter.append(SequenceFileLogWriter.java:111)
at org.apache.hadoop.hbase.regionserver.wal.HLog.doWrite(HLog.java:996)
at org.apache.hadoop.hbase.regionserver.wal.HLog.append(HLog.java:851)
{noformat}
Another that happens when the RS is going down:
{noformat}
2010-11-03 03:18:40,137 ERROR
org.apache.hadoop.hbase.regionserver.HRegionServer:
:java.lang.NullPointerException
at
org.apache.hadoop.io.SequenceFile$Writer.getLength(SequenceFile.java:1048)
at
org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogWriter.getLength(SequenceFileLogWriter.java:132)
at org.apache.hadoop.hbase.regionserver.wal.HLog.sync(HLog.java:913)
{noformat}
But I don't see it during normal runtime.
> Concurrent flushers in HLog sync using HDFS-895
> -----------------------------------------------
>
> Key: HBASE-2467
> URL: https://issues.apache.org/jira/browse/HBASE-2467
> Project: HBase
> Issue Type: Improvement
> Components: regionserver
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Blocker
> Fix For: 0.90.0
>
> Attachments: HBASE-2467-v2.patch, HBASE-2467-v3.patch,
> HBASE-2467-v4.patch, hbase-2467.txt
>
>
> HDFS-895 changes hflush() to be able to run concurrently from multiple
> threads, where flushes can be concurrent with further writes to the same file.
> We need to rip out/amend the group commit code a bit to take advantage of
> this.
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