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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18137) Replication gets stuck for empty WALs
Date Sat, 10 Jun 2017 21:43:18 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16045712#comment-16045712
] 

Hudson commented on HBASE-18137:
--------------------------------

FAILURE: Integrated in Jenkins build HBase-2.0 #23 (See [https://builds.apache.org/job/HBase-2.0/23/])
HBASE-18137 Replication gets stuck for empty WALs (apurtell: rev 385b792446ea1b0c58b7365904d677ba48eec930)
* (edit) hbase-server/src/test/java/org/apache/hadoop/hbase/replication/TestReplicationBase.java
* (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSourceWALReaderThread.java
* (edit) hbase-server/src/test/java/org/apache/hadoop/hbase/replication/TestReplicationSmallTests.java
* (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSourceShipperThread.java


> Replication gets stuck for empty WALs
> -------------------------------------
>
>                 Key: HBASE-18137
>                 URL: https://issues.apache.org/jira/browse/HBASE-18137
>             Project: HBase
>          Issue Type: Bug
>          Components: Replication
>    Affects Versions: 1.3.1
>            Reporter: Ashu Pachauri
>            Assignee: Vincent Poon
>            Priority: Critical
>             Fix For: 2.0.0, 1.4.0, 1.3.2, 1.2.7
>
>         Attachments: HBASE-18137.branch-1.3.v1.patch, HBASE-18137.branch-1.3.v2.patch,
HBASE-18137.branch-1.3.v3.patch, HBASE-18137.branch-1.v1.patch, HBASE-18137.branch-1.v2.patch,
HBASE-18137.master.v1.patch
>
>
> Replication assumes that only the last WAL of a recovered queue can be empty. But, intermittent
DFS issues may cause empty WALs being created (without the PWAL magic), and a roll of WAL
to happen without a regionserver crash. This will cause recovered queues to have empty WALs
in the middle. This cause replication to get stuck:
> {code}
> TRACE regionserver.ReplicationSource: Opening log <wal_file>
> WARN regionserver.ReplicationSource: <peer_cluster_id>-<recovered_queue>
Got: 
> java.io.EOFException
> 	at java.io.DataInputStream.readFully(DataInputStream.java:197)
> 	at java.io.DataInputStream.readFully(DataInputStream.java:169)
> 	at org.apache.hadoop.io.SequenceFile$Reader.init(SequenceFile.java:1915)
> 	at org.apache.hadoop.io.SequenceFile$Reader.initialize(SequenceFile.java:1880)
> 	at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1829)
> 	at org.apache.hadoop.io.SequenceFile$Reader.<init>(SequenceFile.java:1843)
> 	at org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogReader$WALReader.<init>(SequenceFileLogReader.java:70)
> 	at org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogReader.reset(SequenceFileLogReader.java:168)
> 	at org.apache.hadoop.hbase.regionserver.wal.SequenceFileLogReader.initReader(SequenceFileLogReader.java:177)
> 	at org.apache.hadoop.hbase.regionserver.wal.ReaderBase.init(ReaderBase.java:66)
> 	at org.apache.hadoop.hbase.wal.WALFactory.createReader(WALFactory.java:312)
> 	at org.apache.hadoop.hbase.wal.WALFactory.createReader(WALFactory.java:276)
> 	at org.apache.hadoop.hbase.wal.WALFactory.createReader(WALFactory.java:264)
> 	at org.apache.hadoop.hbase.wal.WALFactory.createReader(WALFactory.java:423)
> 	at org.apache.hadoop.hbase.replication.regionserver.ReplicationWALReaderManager.openReader(ReplicationWALReaderManager.java:70)
> 	at org.apache.hadoop.hbase.replication.regionserver.ReplicationSource$ReplicationSourceWorkerThread.openReader(ReplicationSource.java:830)
> 	at org.apache.hadoop.hbase.replication.regionserver.ReplicationSource$ReplicationSourceWorkerThread.run(ReplicationSource.java:572)
> {code}
> The WAL in question was completely empty but there were other WALs in the recovered queue
which were newer and non-empty.



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