Ian Friedman created HBASE-8096:
-----------------------------------
Summary: [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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