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From "Andreas Schnitzerling (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6283) Windows 7 data files keept open / can't be deleted after compaction.
Date Wed, 20 Nov 2013 10:43:35 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13827519#comment-13827519
] 

Andreas Schnitzerling commented on CASSANDRA-6283:
--------------------------------------------------

I see "can't delete" in regular compaction as well. It happens, when I make a lot of changes
to a CF and Cassandra crashes. See my first comment. Without programming that finalizer, which
calls "deallocate()", I couldn't use cassandra. I think in general, the file handling has
to be programmed more accurately like my finalizer shows. Means closing all files direct after
access. What about resource objects in java, which are responsible for closing files latest
on GC?

> Windows 7 data files keept open / can't be deleted after compaction.
> --------------------------------------------------------------------
>
>                 Key: CASSANDRA-6283
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6283
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>         Environment: Windows 7 (32) / Java 1.7.0.45
>            Reporter: Andreas Schnitzerling
>            Priority: Critical
>              Labels: newbie, patch, test
>             Fix For: 2.0.3, 2.1
>
>         Attachments: screenshot-1.jpg, system.log
>
>
> Files cannot be deleted, patch CASSANDRA-5383 (Win7 deleting problem) doesn't help on
Win-7 on Cassandra 2.0.2. Even 2.1 Snapshot is not running. The cause is: Opened file handles
seem to be lost and not closed properly. Win 7 blames, that another process is still using
the file (but its obviously cassandra). Only restart of the server makes the files deleted.
But after heavy using (changes) of tables, there are about 24K files in the data folder (instead
of 35 after every restart) and Cassandra crashes. I experiminted and I found out, that a finalizer
fixes the problem. So after GC the files will be deleted (not optimal, but working fine).
It runs now 2 days continously without problem. Possible fix/test:
> I wrote the following finalizer at the end of class org.apache.cassandra.io.util.RandomAccessReader:
> 	@Override
> 	protected void finalize() throws Throwable {
> 		deallocate();
> 		super.finalize();
> 	}
> Can somebody test / develop / patch it? Thx.



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