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https://issues.apache.org/jira/browse/HBASE-4965?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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nkeywal updated HBASE-4965:
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Attachment: 4965_all.patch
> Monitor the open file descriptors and the threads counters during the unit
> tests
> --------------------------------------------------------------------------------
>
> Key: HBASE-4965
> URL: https://issues.apache.org/jira/browse/HBASE-4965
> Project: HBase
> Issue Type: Improvement
> Components: test
> Affects Versions: 0.94.0
> Environment: all
> Reporter: nkeywal
> Assignee: nkeywal
> Priority: Minor
> Attachments: 4965_all.patch, 4965_all.patch, ResourceChecker.java,
> ResourceCheckerJUnitRule.java
>
>
> We're seeing a lot of issues with hadoop-qa related to threads or file
> descriptors.
> Monitoring these counters would ease the analysis.
> Note as well that
> - if we want to execute the tests in the same jvm (because the test is small
> or because we want to share the cluster) we can't afford to leak too many
> resources
> - if the tests leak, it's more difficult to detect a leak in the software
> itself.
> I attach piece of code that I used. It requires two lines in a unit test
> class to:
> - before every test, count the threads and the open file descriptor
> - after every test, compare with the previous value.
> I ran it on some tests; we have for example:
> - client.TestMultiParallel#testBatchWithManyColsInOneRowGetAndPut: 232
> threads (was 231), 390 file descriptors (was 390). => TestMultiParallel uses
> 232 threads!
> - client.TestMultipleTimestamps#testWithColumnDeletes: 152 threads (was 151),
> 283 file descriptors (was 282).
> - client.TestAdmin#testCheckHBaseAvailableClosesConnection: 477 threads (was
> 294), 815 file descriptors (was 461)
> - client.TestMetaMigrationRemovingHTD#testMetaMigration: 149 threads (was
> 148), 310 file descriptors (was 307).
> It's not always leaks, we can expect some pooling effects. But still...
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