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https://issues.apache.org/jira/browse/HBASE-7086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13489581#comment-13489581
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Ted Yu commented on HBASE-7086:
-------------------------------
Here is sample output from TestHFileCleaner-output in 0.94 branch:
{code}
2012-11-02 10:18:59,231 INFO [main] hbase.ResourceChecker(157): before
master.cleaner.TestHFileCleaner#testTTLCleaner: 43 threads, 145 file
descriptors 0 connections,
2012-11-02 10:18:59,297 DEBUG [main] cleaner.TimeToLiveHFileCleaner(68):
Life:117, ttl:100, current:1351876739296, from: 1351876739179
2012-11-02 10:18:59,299 INFO [main] hbase.ResourceChecker(157): after
master.cleaner.TestHFileCleaner#testTTLCleaner: 44 threads (was 43), 145 file
descriptors (was 145). 0 connections, -thread leak?-
2012-11-02 10:18:59,299 INFO [main] hbase.ResourceChecker(180): after
master.cleaner.TestHFileCleaner#testTTLCleaner: potentially hanging thread
2012-11-02 10:18:59,300 INFO [main] hbase.ResourceChecker(186):
java.lang.Thread.sleep(Native Method)
2012-11-02 10:18:59,300 INFO [main] hbase.ResourceChecker(186):
org.apache.hadoop.hdfs.DFSClient$LeaseChecker.run(DFSClient.java:1379)
2012-11-02 10:18:59,301 INFO [main] hbase.ResourceChecker(186):
java.lang.Thread.run(Thread.java:680)
2012-11-02 10:18:59,305 INFO [main] hbase.ResourceChecker(157): before
master.cleaner.TestHFileCleaner#testHFileCleaning: 44 threads, 145 file
descriptors 0 connections,
{code}
Current goal is to figure out why TestHFileCleaner#testTTLCleaner hangs in 0.94
Trunk patch would be quite different from 0.94 patch.
> Enhance ResourceChecker to log stack trace for potentially hanging threads
> --------------------------------------------------------------------------
>
> Key: HBASE-7086
> URL: https://issues.apache.org/jira/browse/HBASE-7086
> Project: HBase
> Issue Type: Bug
> Reporter: Ted Yu
> Attachments: 7086.94
>
>
> Currently ResourceChecker logs a line similar to the following if it detects
> potential thread leak:
> {code}
> 2012-11-02 10:18:59,299 INFO [main] hbase.ResourceChecker(157): after
> master.cleaner.TestHFileCleaner#testTTLCleaner: 44 threads (was 43), 145 file
> descriptors (was 145). 0 connections, -thread leak?-
> {code}
> We should enhance the log to include stack trace of the potentially hanging
> thread(s)
> This work was motivated when I investigated test failure in HBASE-6796
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