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From "Josh Elser (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-3182) WAL repeatedly failed recovery due to NPE in IT
Date Tue, 30 Sep 2014 18:43:34 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-3182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14153538#comment-14153538
] 

Josh Elser commented on ACCUMULO-3182:
--------------------------------------

bq. If a user is using hflush, then wouldn't this condition of an empty log still need to
be handled in recovery?

Yes, but even so, because the log entry is written before the header is written, any sort
of sync (hflush or hsync) on the header would be without gain.

> WAL repeatedly failed recovery due to NPE in IT
> -----------------------------------------------
>
>                 Key: ACCUMULO-3182
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-3182
>             Project: Accumulo
>          Issue Type: Bug
>          Components: tserver
>    Affects Versions: 1.5.2, 1.6.1
>            Reporter: Josh Elser
>            Assignee: Josh Elser
>             Fix For: 1.5.3, 1.6.2, 1.7.0
>
>         Attachments: 0001-ACCUMULO-3182-Gracefully-handles-incomplete-missing-.patch
>
>
> Haven't ever seen this one before. A replication IT failed -- looking into it, it was
because the tserver that came up (after killing the original) failed to complete recovery.
The below happened a few times before the test ultimately timed out.
> {noformat}
> 2014-09-29 04:46:10,259 [zookeeper.DistributedWorkQueue] DEBUG: Looking for work in /accumulo/f98e79c4-9dcd-4fb0-8ec9-5804f0818839/recovery
> 2014-09-29 04:46:10,340 [zookeeper.DistributedWorkQueue] DEBUG: got lock for af53bf1e-c293-463b-b4de-5efdb8b34962
> 2014-09-29 04:46:10,341 [log.LogSorter] DEBUG: Sorting file:/.../test/target/mini-tests/org.apache.accumulo.test.replication.UnorderedWorkAssignerReplicationIT_dataReplicatedToCorrectTableWithoutDrain/accumulo/wal/juno+49195/af53bf1e-c293-463b-b4de-5efdb8b34962
to file:/.../test/target/mini-tests/org.apache.accumulo.test.replication.UnorderedWorkAssignerReplicationIT_dataReplicatedToCorrectTableWithoutDrain/accumulo/recovery/af53bf1e-c293-463b-b4de-5efdb8b34962
using sortId af53bf1e-c293-463b-b4de-5efdb8b34962
> 2014-09-29 04:46:10,341 [log.LogSorter] INFO : Copying file:/var/lib/jenkins/home/jobs/Accumulo-Master-Integration-Tests/workspace/test/target/mini-tests/org.apache.accumulo.test.replication.UnorderedWorkAssignerReplicationIT_dataReplicatedToCorrectTableWithoutDrain/accumulo/wal/juno+49195/af53bf1e-c293-463b-b4de-5efdb8b34962
to file:/.../test/target/mini-tests/org.apache.accumulo.test.replication.UnorderedWorkAssignerReplicationIT_dataReplicatedToCorrectTableWithoutDrain/accumulo/recovery/af53bf1e-c293-463b-b4de-5efdb8b34962
> 2014-09-29 04:46:10,345 [log.LogSorter] ERROR: java.io.EOFException
> java.io.EOFException
> 	at java.io.DataInputStream.readFully(DataInputStream.java:197)
> 	at java.io.DataInputStream.readFully(DataInputStream.java:169)
> 	at org.apache.accumulo.tserver.log.DfsLogger.readHeaderAndReturnStream(DfsLogger.java:282)
> 	at org.apache.accumulo.tserver.log.LogSorter$LogProcessor.sort(LogSorter.java:113)
> 	at org.apache.accumulo.tserver.log.LogSorter$LogProcessor.process(LogSorter.java:93)
> 	at org.apache.accumulo.server.zookeeper.DistributedWorkQueue$1.run(DistributedWorkQueue.java:105)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> 	at org.apache.accumulo.trace.instrument.TraceRunnable.run(TraceRunnable.java:47)
> 	at org.apache.accumulo.core.util.LoggingRunnable.run(LoggingRunnable.java:34)
> 	at java.lang.Thread.run(Thread.java:745)
> 2014-09-29 04:46:10,346 [log.LogSorter] ERROR: Error during cleanup sort/copy af53bf1e-c293-463b-b4de-5efdb8b34962
> java.lang.NullPointerException
> 	at org.apache.accumulo.tserver.log.LogSorter$LogProcessor.close(LogSorter.java:183)
> 	at org.apache.accumulo.tserver.log.LogSorter$LogProcessor.sort(LogSorter.java:151)
> 	at org.apache.accumulo.tserver.log.LogSorter$LogProcessor.process(LogSorter.java:93)
> 	at org.apache.accumulo.server.zookeeper.DistributedWorkQueue$1.run(DistributedWorkQueue.java:105)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> 	at org.apache.accumulo.trace.instrument.TraceRunnable.run(TraceRunnable.java:47)
> 	at org.apache.accumulo.core.util.LoggingRunnable.run(LoggingRunnable.java:34)
> 	at java.lang.Thread.run(Thread.java:745)
> {noformat}



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