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From "Dave Latham (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8096) [replication] NPE while replicating a log that is acquiring a new block from HDFS
Date Fri, 12 Apr 2013 23:36:17 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13630761#comment-13630761
] 

Dave Latham commented on HBASE-8096:
------------------------------------

Thanks guys for looking it over.  Would love to see it committed for 0.94.7.
                
> [replication] NPE while replicating a log that is acquiring a new block from HDFS 
> ----------------------------------------------------------------------------------
>
>                 Key: HBASE-8096
>                 URL: https://issues.apache.org/jira/browse/HBASE-8096
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.94.5
>            Reporter: Ian Friedman
>            Assignee: Dave Latham
>         Attachments: HBASE-8096.0.94.patch, HBASE-8096.patch
>
>
> We're getting an NPE during replication, which causes replication for that RegionServer
to stop until we restart it.
> {noformat}
> 2013-03-10 12:49:12,679 ERROR org.apache.hadoop.hbase.replication.regionserver.ReplicationSource:
Unexpected exception in ReplicationSource, currentPath=hdfs://hmaster1:9000/hbase/.logs/hslave1177,60020,1362549511446/hslave1177%2C60020%2C1362549511446.1362944946489
> java.lang.NullPointerException
>         at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.updateBlockInfo(DFSClient.java:1882)
>         at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.openInfo(DFSClient.java:1855)
>         at org.apache.hadoop.hdfs.DFSClient$DFSInputStream.<init>(DFSClient.java:1831)
>         at org.apache.hadoop.hdfs.DFSClient.open(DFSClient.java:578)
>         at org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:154)
>         at org.apache.hadoop.fs.FilterFileSystem.open(FilterFileSystem.java:108)
>         at org.apache.hadoop.io.SequenceFile$Reader.openFile(SequenceFile.java:1495)
>         at org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogReader$WALReader.openFile(SequenceFileLogReader.java:62)
>         at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1482)
>         at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1475)
>         at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1470)
>         at org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogReader$WALReader.<init>(SequenceFileLogReader.java:55)
>         at org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogReader.reset(SequenceFileLogReader.java:308)
>         at org.apache.hadoop.hbase.replication.regionserver.ReplicationHLogReaderManager.openReader(ReplicationHLogReaderManager.java:69)
>         at org.apache.hadoop.hbase.replication.regionserver.ReplicationSource.openReader(ReplicationSource.java:505)
>         at org.apache.hadoop.hbase.replication.regionserver.ReplicationSource.run(ReplicationSource.java:313)
> {noformat}
> Some extra digging into the DataNode and NameNode logs makes this seem related to HBASE-7530
and HDFS-4380
> Here's the relevant snipped portions of the RS, DN, and NN logs:
> {noformat}
> RS 2013-03-10 12:49:12,618 INFO org.apache.hadoop.hbase.replication.regionserver.ReplicationSourceManager:
Going to report log #hslave1177%2C60020%2C1362549511446.1362944946489 for position 59670826
in hdfs://hmaster1:9000/hbase/.logs/hslave1177,60020,1362549511446/hslave1177%2C60020%2C1362549511446.1362944946489
> RS 2013-03-10 12:49:12,621 DEBUG org.apache.hadoop.hbase.regionserver.LogRoller: HLog
roll requested
> RS 2013-03-10 12:49:12,623 DEBUG org.apache.hadoop.hbase.replication.regionserver.ReplicationSource:
Replicated in total: 31500300
> RS 2013-03-10 12:49:12,623 DEBUG org.apache.hadoop.hbase.replication.regionserver.ReplicationSource:
Opening log for replication hslave1177%2C60020%2C1362549511446.1362944946489 at 59670826
> NN 2013-03-10 12:49:12,627 INFO org.apache.hadoop.hdfs.StateChange: BLOCK* NameSystem.allocateBlock:
/hbase/.logs/hslave1177,60020,1362549511446/hslave1177%2C60020%2C1362549511446.1362944946489.
blk_6905758215335505153_656717631
> RS 2013-03-10 12:49:12,679 ERROR org.apache.hadoop.hbase.replication.regionserver.ReplicationSource:
Unexpected exception in ReplicationSource, currentPath=hdfs://hmaster1:9000/hbase/.logs/hslave1177,60020,1362549511446/hslave1177%2C60020%2C1362549511446.1362944946489
> DN 2013-03-10 12:49:12,680 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: Receiving
block blk_6905758215335505153_656717631 src: /192.168.44.1:43503 dest: /192.168.44.1:50010
> NN 2013-03-10 12:49:12,804 INFO org.apache.hadoop.hdfs.StateChange: BLOCK* NameSystem.fsync:
file /hbase/.logs/hslave1177,60020,1362549511446/hslave1177%2C60020%2C1362549511446.1362944946489
for DFSClient_hb_rs_hslave1177,60020,1362549511446
> {noformat}

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