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From "Russ Hatch (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-11195) paging may returns incomplete results on small page size
Date Fri, 18 Mar 2016 15:39:33 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-11195?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15201650#comment-15201650
] 

Russ Hatch commented on CASSANDRA-11195:
----------------------------------------

Local repro notes:
{noformat}
grab this dtest branch: https://github.com/riptano/cassandra-dtest/tree/debug_11195
pip install ipdb
run the test in a loop until it fails and you can interactively debug, this might take a while...
for i in $(seq 1 100); do echo $i; UPGRADE_TEST_RUN=true nosetests upgrade_tests/paging_test.py:TestPagingDataNodes2RF1_2_2_UpTo_3_3_HEAD.static_columns_paging_test;
done
{noformat}

> paging may returns incomplete results on small page size
> --------------------------------------------------------
>
>                 Key: CASSANDRA-11195
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11195
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Jim Witschey
>            Assignee: Russ Hatch
>              Labels: dtest
>         Attachments: node1.log, node1_debug.log, node2.log, node2_debug.log
>
>
> This was found through a flapping test, and running that test is still the easiest way
to repro the issue. On CI we're seeing a 40-50% failure rate, but locally this test fails
much less frequently.
> If I attach a python debugger and re-query the "bad" query, it continues to return incomplete
data indefinitely. If I go directly to cqlsh I can see all rows just fine.
> On some upgrade paths, {{static_columns_paging_test}} is flapping:
> http://cassci.datastax.com/job/upgrade_tests-all/9/testReport/upgrade_tests.paging_test/TestPagingDataNodes2RF1_2_2_HEAD_UpTo_Trunk/static_columns_paging_test/history/
> http://cassci.datastax.com/job/upgrade_tests-all/8/testReport/upgrade_tests.paging_test/TestPagingDataNodes2RF1_2_2_UpTo_Trunk/static_columns_paging_test/history/
> http://cassci.datastax.com/job/upgrade_tests-all/8/testReport/upgrade_tests.paging_test/TestPagingDataNodes2RF1_2_2_UpTo_3_3_HEAD/static_columns_paging_test/history
> The failures indicate there is missing data. I have not reproduced the failure locally.
I've only seen the failures on 2-node clusters with RF=1, not on the 3-node runs with RF=3.



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