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From "Ian Friedman (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-8096) [replication] NPE while replicating a log that is acquiring a new block from HDFS
Date Wed, 13 Mar 2013 22:40:12 GMT
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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