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https://issues.apache.org/jira/browse/HBASE-8096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13601754#comment-13601754
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Ian Friedman commented on HBASE-8096:
-------------------------------------
One workaround we've come up with is to set the
hbase.regionserver.hlog.blocksize high, like 128M, and then the
hbase.regionserver.logroll.multiplier to 50%
> [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
>
> 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:
> https://issues.apache.org/jira/browse/HBASE-7530
> and
> https://issues.apache.org/jira/browse/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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