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From "Benedict (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-10109) Windows dtest 3.0: ttl_test.py failures
Date Tue, 18 Aug 2015 08:15:45 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14700906#comment-14700906
] 

Benedict commented on CASSANDRA-10109:
--------------------------------------

Reading the Windows documentation it does look like there really are no guarantees. At least,
it states absolutely no guarantees. The files are each returned by independent method calls,
leaving me with even less confidence if they don't state it outright.

So, yes, I'd say the best thing we can do is to read all of the files in the directory into
a buffer, then read all of the transaction files we encounter, and then classify the transaction
files based on presence of all old files. If some are missing, then we assume the transaction
has been committed; if all are present we assume it's in progress. We should make behaviour
in the case of missing files optional, as in many cases missing the new files would be fine,
I suspect. There's always the risk that a file is deleted after it's found and returned, so
the user has to be robust to that. All we care about is ensuring we return a consistent snapshot,
or a subset thereof.

> Windows dtest 3.0: ttl_test.py failures
> ---------------------------------------
>
>                 Key: CASSANDRA-10109
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10109
>             Project: Cassandra
>          Issue Type: Sub-task
>            Reporter: Joshua McKenzie
>            Assignee: Stefania
>              Labels: Windows
>             Fix For: 3.0.x
>
>
> ttl_test.py:TestTTL.update_column_ttl_with_default_ttl_test2
> ttl_test.py:TestTTL.update_multiple_columns_ttl_test
> ttl_test.py:TestTTL.update_single_column_ttl_test
> Errors locally are different than CI from yesterday. Yesterday on CI we have timeouts
and general node hangs. Today on all 3 tests when run locally I see:
> {noformat}
> Traceback (most recent call last):
>   File "c:\src\cassandra-dtest\dtest.py", line 532, in tearDown
>     raise AssertionError('Unexpected error in %s node log: %s' % (node.name, errors))
> AssertionError: Unexpected error in node1 node log: ['ERROR [main] 2015-08-17 16:53:43,120
NoSpamLogger.java:97 - This platform does not support atomic directory streams (SecureDirectoryStream);
race conditions when loading sstable files could occurr']
> {noformat}
> This traces back to the commit for CASSANDRA-7066 today by [~Stefania] and [~benedict].
 Stefania - care to take this ticket and also look further into whether or not we're going
to have issues with 7066 on Windows? That error message certainly *sounds* like it's not a
good thing.



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