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https://issues.apache.org/jira/browse/HBASE-4965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13163947#comment-13163947
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stack commented on HBASE-4965:
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So, you want to add it for running of all current tests? Sounds good to me
(Classes are missing license and class comments explaining what they are at).
We have to add the @Rule to every test method or just to each Test class?
> 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: 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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