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https://issues.apache.org/jira/browse/ACCUMULO-909?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Keith Turner updated ACCUMULO-909:
----------------------------------
Fix Version/s: 1.4.3
1.5.0
Affects Version/s: (was: 1.5.0)
1.4.0
> NPE thrown for tablet readahead thread
> --------------------------------------
>
> Key: ACCUMULO-909
> URL: https://issues.apache.org/jira/browse/ACCUMULO-909
> Project: Accumulo
> Issue Type: Improvement
> Components: tserver
> Affects Versions: 1.4.0
> Environment: CentOS-5.7, Oracle Java 1.6.0_30
> Reporter: Josh Elser
> Assignee: Eric Newton
> Priority: Minor
> Fix For: 1.5.0, 1.4.3
>
>
> I've had the below log snippet happen to me a couple of times while running
> continuous ingest. It doesn't appear to cause any issues, but it pops up
> annoyingly on the monitor. The context around the stacktrace in the log seems
> to be a new native map being allocated, a statement about a minor compaction
> starting, the NPE, and then the deallocation of the previous native map. I
> don't know enough about what actually is happening (or if my previous
> understanding is even an accurate cause), but I'd be happy to investigate
> deeper if someone can provide some guidance/understanding.
> {noformat}
> 2012-12-16 21:02:02,822 [tabletserver.NativeMap] DEBUG: Allocated native map
> 0x00002aaaee88a8e0
> 2012-12-16 21:02:02,822 [tabletserver.MinorCompactor] DEBUG: Begin minor
> compaction /accumulo/tables/n/t-0001idd/F0001ivx.rf_tmp n;3;25
> 2012-12-16 21:02:02,895 [util.NamingThreadFactory] ERROR: Thread "tablet read
> ahead 15" died null
> java.lang.NullPointerException
> at
> org.apache.accumulo.server.tabletserver.TabletServer$ThriftClientHandler$NextBatchTask.run(TabletServer.java:959)
> at
> org.apache.accumulo.cloudtrace.instrument.TraceRunnable.run(TraceRunnable.java:47)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at
> org.apache.accumulo.cloudtrace.instrument.TraceRunnable.run(TraceRunnable.java:47)
> at
> org.apache.accumulo.core.util.LoggingRunnable.run(LoggingRunnable.java:34)
> at java.lang.Thread.run(Thread.java:662)
> 2012-12-16 21:02:02,913 [tabletserver.TabletServer] DEBUG: UpSess null 12,565
> in 0.547s, at=[0 0 0.00 2] ft=0.464s(pt=0.123s lt=0.184s ct=0.157s)
> 2012-12-16 21:02:02,907 [tabletserver.TabletServer] DEBUG: UpSess null 12,373
> in 0.544s, at=[0 0 0.00 2] ft=0.447s(pt=0.120s lt=0.186s ct=0.141s)
> 2012-12-16 21:02:02,943 [tabletserver.TabletServer] DEBUG: Failures: 1, first
> extent n;3;25 successful commits: 0
> 2012-12-16 21:02:02,955 [tabletserver.TabletServer] DEBUG: Failures: 1, first
> extent n;3;25 successful commits: 0
> 2012-12-16 21:02:03,050 [tabletserver.LargestFirstMemoryManager] DEBUG:
> BEFORE compactionThreshold = 0.627 maxObserved = 644,460,454
> 2012-12-16 21:02:03,050 [tabletserver.LargestFirstMemoryManager] DEBUG: AFTER
> compactionThreshold = 0.689
> 2012-12-16 21:21:55,587 [tabletserver.Compactor] DEBUG: Compaction
> n;4a81;47c09 45,951 read | 45,951 written | 178,797 entries/sec | 0.257 secs
> 2012-12-16 21:21:55,590 [tabletserver.Tablet] DEBUG: Logs for memory
> compacted: n;4a81;47c09 10.10.32.123+9997/ef83a2e7-f6e6-481c-8351-ae8b623c96e6
> 2012-12-16 21:21:55,595 [log.TabletServerLogger] DEBUG: wrote MinC finish
> 36231: writeTime:0ms
> 2012-12-16 21:21:55,596 [tabletserver.Tablet] TABLET_HIST: n;4a81;47c09 MinC
> [memory] -> /t-0001iw3/F0001ixf.rf
> 2012-12-16 21:21:55,596 [tabletserver.Tablet] DEBUG: MinC finish lock 0.00
> secs n;4a81;47c09
> 2012-12-16 21:21:55,596 [tabletserver.NativeMap] DEBUG: Deallocating native
> map 0x00002aaab82f71b0
> 2012-12-16 21:21:55,633 [tabletserver.NativeMap] DEBUG: Deallocating native
> map 0x00002aab13fe7f10
> {noformat}
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