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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15019) Replication stuck when HDFS is restarted
Date Thu, 28 Jan 2016 19:17:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15122141#comment-15122141
] 

Hudson commented on HBASE-15019:
--------------------------------

SUCCESS: Integrated in HBase-1.3-IT #466 (See [https://builds.apache.org/job/HBase-1.3-IT/466/])
HBASE-15019 Replication stuck when HDFS is restarted. (matteo.bertozzi: rev 67c2fc7cd62f5d53da633f08d5a3c93600ac86f0)
* hbase-server/src/main/java/org/apache/hadoop/hbase/wal/WALFactory.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/util/LeaseNotRecoveredException.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSource.java


> Replication stuck when HDFS is restarted
> ----------------------------------------
>
>                 Key: HBASE-15019
>                 URL: https://issues.apache.org/jira/browse/HBASE-15019
>             Project: HBase
>          Issue Type: Bug
>          Components: Replication, wal
>    Affects Versions: 2.0.0, 1.2.0, 1.1.2, 1.0.3, 0.98.16.1
>            Reporter: Matteo Bertozzi
>            Assignee: Matteo Bertozzi
>             Fix For: 2.0.0, 1.2.0, 1.3.0, 1.1.4, 1.0.4, 0.98.18
>
>         Attachments: HBASE-15019-v0_branch-1.2.patch, HBASE-15019-v1.patch, HBASE-15019-v1_0.98.patch,
HBASE-15019-v1_branch-1.2.patch, HBASE-15019-v2.patch, HBASE-15019-v3.patch, HBASE-15019-v4.patch
>
>
> RS is normally working and writing on the WAL.
> HDFS is killed and restarted, and the RS try to do a roll.
> The close fail, but the roll succeed (because hdfs is now up) and everything works.
> {noformat}
> 2015-12-11 21:52:28,058 ERROR org.apache.hadoop.hbase.regionserver.wal.ProtobufLogWriter:
Got IOException while writing trailer
> java.io.IOException: All datanodes 10.51.30.152:50010 are bad. Aborting...
>   at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:1147)
>   at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.processDatanodeError(DFSOutputStream.java:945)
>   at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:496)
> 2015-12-11 21:52:28,059 ERROR org.apache.hadoop.hbase.regionserver.wal.FSHLog: Failed
close of HLog writer
> java.io.IOException: All datanodes 10.51.30.152:50010 are bad. Aborting...
>   at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.setupPipelineForAppendOrRecovery(DFSOutputStream.java:1147)
>   at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.processDatanodeError(DFSOutputStream.java:945)
>   at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:496)
> 2015-12-11 21:52:28,059 WARN org.apache.hadoop.hbase.regionserver.wal.FSHLog: Riding
over HLog close failure! error count=1
> {noformat}
> The problem is on the replication side. that log we rolled and we were not able to close
> is waiting for a lease recovery.
> {noformat}
> 2015-12-11 21:16:31,909 ERROR org.apache.hadoop.hbase.regionserver.wal.HLogFactory: Can't
open after 267 attempts and 301124ms 
> {noformat}
> the WALFactory notify us about that, but there is nothing on the RS side that perform
the WAL recovery.
> {noformat}
> 2015-12-11 21:11:30,921 WARN org.apache.hadoop.hbase.regionserver.wal.HLogFactory: Lease
should have recovered. This is not expected. Will retry
> java.io.IOException: Cannot obtain block length for LocatedBlock{BP-1547065147-10.51.30.152-1446756937665:blk_1073801614_61243;
getBlockSize()=83; corrupt=false; offset=0; locs=[10.51.30.154:50010, 10.51.30.152:50010,
10.51.30.155:50010]}
>   at org.apache.hadoop.hdfs.DFSInputStream.readBlockLength(DFSInputStream.java:358)
>   at org.apache.hadoop.hdfs.DFSInputStream.fetchLocatedBlocksAndGetLastBlockLength(DFSInputStream.java:300)
>   at org.apache.hadoop.hdfs.DFSInputStream.openInfo(DFSInputStream.java:237)
>   at org.apache.hadoop.hdfs.DFSInputStream.<init>(DFSInputStream.java:230)
>   at org.apache.hadoop.hdfs.DFSClient.open(DFSClient.java:1448)
>   at org.apache.hadoop.hdfs.DistributedFileSystem$3.doCall(DistributedFileSystem.java:301)
>   at org.apache.hadoop.hdfs.DistributedFileSystem$3.doCall(DistributedFileSystem.java:297)
>   at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
>   at org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:297)
>   at org.apache.hadoop.fs.FilterFileSystem.open(FilterFileSystem.java:161)
>   at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:766)
>   at org.apache.hadoop.hbase.regionserver.wal.HLogFactory.createReader(HLogFactory.java:116)
>   at org.apache.hadoop.hbase.regionserver.wal.HLogFactory.createReader(HLogFactory.java:89)
>   at org.apache.hadoop.hbase.regionserver.wal.HLogFactory.createReader(HLogFactory.java:77)
>   at org.apache.hadoop.hbase.replication.regionserver.ReplicationHLogReaderManager.openReader(ReplicationHLogReaderManager.java:68)
>   at org.apache.hadoop.hbase.replication.regionserver.ReplicationSource.openReader(ReplicationSource.java:508)
>   at org.apache.hadoop.hbase.replication.regionserver.ReplicationSource.run(ReplicationSource.java:321)
> {noformat}
> the only way to trigger a WAL recovery is to restart and force the master to trigger
the lease recovery on WAL split. 
> but there is a case where restarting will not help. If the RS keeps going rolling and
flushing the unclosed WAL will be moved in the archive, and at that point the master will
never try to do a lease recovery on it. 
> since we know that the RS is still going, should we try to recover the lease on the RS
side?
> is it better/safer to trigger an abort on the RS, so we have only the master doing lease
recovery?



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