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From "Kristian Waagan (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-5624) System can run out of stack space while processing DropOnCommit requests.
Date Tue, 28 Feb 2012 14:45:49 GMT

    [ https://issues.apache.org/jira/browse/DERBY-5624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13218233#comment-13218233
] 

Kristian Waagan commented on DERBY-5624:
----------------------------------------

A change introduced by DERBY-5614 may have cause the slowdown, but I don't see how it's related
to the extra disk usage. The bug in SpawnedProcess would cause the VM to stay alive idling
until the TimerTask got purged (even when cancelled), but the order of the tests matters.
So it would only be relevant if a test using SpawnedProcess ran less than 45 minutes before
the last test in the run finished.

When I ran suites.All in parallell just now (4 runners), it took 1 hour and 6 minutes (including
org.apache.derby.PackagePrivateTestSuite and org.apache.derbyTesting.functionTests.tests.memory._Suite).
This was on Solaris 11 with JDK 7. Assuming all 4 runners are busy at all times that's a worst
case time of around 4.5 hours - 11 hours definitely sounds like way too much (unless that
machine is running a lot of other stuff at the same time).
                
> System can run out of stack space while processing DropOnCommit requests.
> -------------------------------------------------------------------------
>
>                 Key: DERBY-5624
>                 URL: https://issues.apache.org/jira/browse/DERBY-5624
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>    Affects Versions: 10.8.2.2
>            Reporter: Mike Matrigali
>            Assignee: Mike Matrigali
>              Labels: derby_triage10_9
>             Fix For: 10.9.0.0
>
>         Attachments: DERBY-5624.patch, error-stacktrace_mod.out, largedatasuite_mod.out
>
>
> The system currently recursively calls xact.notifyObservers() from DropOnCommit.update().
 It does this because in some cases
> new observers can be added while processing the list of notifyObservers and those were
being missed before the change, causing
> Assertions in the tests and possibly files not properly dropped on commit.
> Multiple users on the Derby user list have had failures running SYSCS_UTIL.SYSCS_COMPRESS_TABLE(),
running out of stack track
> with a heavily recursive stack trace of the form (see more detail from these reports
in subsequent comments):
> Caused by: java.lang.StackOverflowError
> at java.lang.ThreadLocal.get(ThreadLocal.java:125)
> at java.lang.StringCoding.deref(StringCoding.java:46)
> at java.lang.StringCoding.encode(StringCoding.java:258)
> at java.lang.String.getBytes(String.java:946)
> at java.io.UnixFileSystem.getBooleanAttributes0(Native Method)
> at java.io.UnixFileSystem.getBooleanAttributes(UnixFileSystem.java:228)
> at java.io.File.exists(File.java:733)
> at org.apache.derby.impl.store.raw.data.StreamFileContainer.run(Unknown Source)
> at java.security.AccessController.doPrivileged(Native Method)
> at org.apache.derby.impl.store.raw.data.StreamFileContainer.privExists(Unknown Source)
> at org.apache.derby.impl.store.raw.data.StreamFileContainer.open(Unknown Source)
> at org.apache.derby.impl.store.raw.data.BaseDataFileFactory.openStreamContainer(Unknown
Source)
> at org.apache.derby.impl.store.raw.xact.Xact.openStreamContainer(Unknown Source)
> at org.apache.derby.impl.store.raw.data.BaseDataFileFactory.dropStreamContainer(Unknown
Source)
> at org.apache.derby.impl.store.raw.xact.Xact.dropStreamContainer(Unknown Source)
> at org.apache.derby.impl.store.raw.data.DropOnCommit.update(Unknown Source)
> at java.util.Observable.notifyObservers(Observable.java:142)
> at org.apache.derby.iapi.store.raw.xact.RawTransaction.notifyObservers(Unknown Source)
> at org.apache.derby.impl.store.raw.data.DropOnCommit.update(Unknown Source)
> at java.util.Observable.notifyObservers(Observable.java:142)
> at org.apache.derby.iapi.store.raw.xact.RawTransaction.notifyObservers(Unknown Source)
> at org.apache.derby.impl.store.raw.data.DropOnCommit.update(Unknown Source)
> at java.util.Observable.notifyObservers(Observable.java:142)
> at org.apache.derby.iapi.store.raw.xact.RawTransaction.notifyObservers(Unknown Source)
> at org.apache.derby.impl.store.raw.data.DropOnCommit.update(Unknown Source)
> at java.util.Observable.notifyObservers(Observable.java:142)

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