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From "Ariel Weisberg (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13182) test failure in sstableutil_test.SSTableUtilTest.compaction_test
Date Fri, 19 May 2017 16:45:04 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13182?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16017635#comment-16017635
] 

Ariel Weisberg commented on CASSANDRA-13182:
--------------------------------------------

Thanks for the fix. I'll keep a look out for this test to see if it fails again.

One suggestion for this kind of flakey test bug where you are checking a condition asynchronously
and you don't know when it's going to happen. Spin on the condition checking it once a second
and then set a longish timeout (longer than 5 seconds, say 30) and only fail if the condition
doesn't occur within the time limit. It's not unheard of to have crazy pauses on the infrastructure
we run these tests on that last a few seconds. Trying to guess how long the magic number to
wait is a source of flakey tests and setting the magic number longer ends up increasing test
runtime when the condition has already become true.

You can factor out the spin until condition is true and error if it doesn't happen within
the time limit to a dedicated method in a dtest utility class so all you have to provide is
a boolean function object to check the condition.

> test failure in sstableutil_test.SSTableUtilTest.compaction_test
> ----------------------------------------------------------------
>
>                 Key: CASSANDRA-13182
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13182
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Michael Shuler
>            Assignee: Lerh Chuan Low
>              Labels: dtest, test-failure, test-failure-fresh
>         Attachments: node1_debug.log, node1_gc.log, node1.log
>
>
> example failure:
> http://cassci.datastax.com/job/trunk_novnode_dtest/506/testReport/sstableutil_test/SSTableUtilTest/compaction_test
> {noformat}
> Error Message
> Lists differ: ['/tmp/dtest-Rk_3Cs/test/node1... != ['/tmp/dtest-Rk_3Cs/test/node1...
> First differing element 8:
> '/tmp/dtest-Rk_3Cs/test/node1/data1/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-2-big-CRC.db'
> '/tmp/dtest-Rk_3Cs/test/node1/data1/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-6-big-CRC.db'
> First list contains 7 additional elements.
> First extra element 24:
> '/tmp/dtest-Rk_3Cs/test/node1/data2/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-5-big-Data.db'
>   ['/tmp/dtest-Rk_3Cs/test/node1/data0/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-4-big-CRC.db',
>    '/tmp/dtest-Rk_3Cs/test/node1/data0/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-4-big-Data.db',
>    '/tmp/dtest-Rk_3Cs/test/node1/data0/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-4-big-Digest.crc32',
>    '/tmp/dtest-Rk_3Cs/test/node1/data0/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-4-big-Filter.db',
>    '/tmp/dtest-Rk_3Cs/test/node1/data0/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-4-big-Index.db',
>    '/tmp/dtest-Rk_3Cs/test/node1/data0/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-4-big-Statistics.db',
>    '/tmp/dtest-Rk_3Cs/test/node1/data0/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-4-big-Summary.db',
>    '/tmp/dtest-Rk_3Cs/test/node1/data0/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-4-big-TOC.txt',
> -  '/tmp/dtest-Rk_3Cs/test/node1/data1/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-2-big-CRC.db',
> -  '/tmp/dtest-Rk_3Cs/test/node1/data1/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-2-big-Digest.crc32',
> -  '/tmp/dtest-Rk_3Cs/test/node1/data1/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-2-big-Filter.db',
> -  '/tmp/dtest-Rk_3Cs/test/node1/data1/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-2-big-Index.db',
> -  '/tmp/dtest-Rk_3Cs/test/node1/data1/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-2-big-Statistics.db',
> -  '/tmp/dtest-Rk_3Cs/test/node1/data1/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-2-big-Summary.db',
> -  '/tmp/dtest-Rk_3Cs/test/node1/data1/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-2-big-TOC.txt',
>    '/tmp/dtest-Rk_3Cs/test/node1/data1/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-6-big-CRC.db',
>    '/tmp/dtest-Rk_3Cs/test/node1/data1/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-6-big-Data.db',
>    '/tmp/dtest-Rk_3Cs/test/node1/data1/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-6-big-Digest.crc32',
>    '/tmp/dtest-Rk_3Cs/test/node1/data1/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-6-big-Filter.db',
>    '/tmp/dtest-Rk_3Cs/test/node1/data1/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-6-big-Index.db',
>    '/tmp/dtest-Rk_3Cs/test/node1/data1/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-6-big-Statistics.db',
>    '/tmp/dtest-Rk_3Cs/test/node1/data1/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-6-big-Summary.db',
>    '/tmp/dtest-Rk_3Cs/test/node1/data1/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-6-big-TOC.txt',
>    '/tmp/dtest-Rk_3Cs/test/node1/data2/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-5-big-CRC.db',
>    '/tmp/dtest-Rk_3Cs/test/node1/data2/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-5-big-Data.db',
>    '/tmp/dtest-Rk_3Cs/test/node1/data2/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-5-big-Digest.crc32',
>    '/tmp/dtest-Rk_3Cs/test/node1/data2/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-5-big-Filter.db',
>    '/tmp/dtest-Rk_3Cs/test/node1/data2/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-5-big-Index.db',
>    '/tmp/dtest-Rk_3Cs/test/node1/data2/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-5-big-Statistics.db',
>    '/tmp/dtest-Rk_3Cs/test/node1/data2/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-5-big-Summary.db',
>    '/tmp/dtest-Rk_3Cs/test/node1/data2/keyspace1/standard1-11ee2450e8ab11e6b5a68de39eb517c4/mc-5-big-TOC.txt']
> -------------------- >> begin captured logging << --------------------
> {noformat}



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