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https://issues.apache.org/jira/browse/DERBY-1902?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12586652#action_12586652
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Mamta A. Satoor commented on DERBY-1902:
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Saw this on trunk (revision 645005) with ibm16
> Intermittent failures in predicatePushdown.sql
> ----------------------------------------------
>
> Key: DERBY-1902
> URL: https://issues.apache.org/jira/browse/DERBY-1902
> Project: Derby
> Issue Type: Bug
> Components: Regression Test Failure, SQL, Test
> Affects Versions: 10.3.1.4
> Environment: Seen on both Solaris 10 and Linux on 2-CPU Opteron
> boxes, disk cache off
> Reporter: Øystein Grøvlen
> Attachments: derbylang.zip
>
>
> For the last week, there have been intermittent failures in the night test in
> lang/predicatePushdown.sql. There is a plan diff which starts as follows:
> ********* Diff file derbyall/derbylang/predicatePushdown.diff
> *** Start: predicatePushdown jdk1.5.0_07 derbyall:derbylang 2006-09-29
> 00:39:36 ***
> 4593 del
> < Hash Join ResultSet:
> 4593a4593
> > Nested Loop Join ResultSet:
> I did not find any changes that seem relevant before the first failing night
> test.
> This test has not failed in the tinderbox test which runs on a computer with
> the disk cache on. For both computers where the failure is seen, the disk
> cache has been turned off. Hence, it may be that another plan is picked
> because of slower I/O.
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