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From "Joshua McKenzie (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6283) Windows 7 data files keept open / can't be deleted after compaction.
Date Wed, 19 Feb 2014 23:30:20 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13906272#comment-13906272
] 

Joshua McKenzie commented on CASSANDRA-6283:
--------------------------------------------

Looks like that's the case, though the documentation for DeleteFile (http://msdn.microsoft.com/en-us/library/windows/desktop/aa363915(v=vs.85).aspx)
doesn't indicate anything about hard links to open files being non-deletable.  Every use case
I'm digging up shows that that's the case however:

http://superuser.com/questions/678357/how-to-delete-windows-ntfs-hard-link-mklink-h-while-original-is-in-use

There's an ecosystem of tools surrounding working around this type of thing on Windows - PendMoves
and MoveFile from sysinternals, for instance

We could go a route similar to FileUtils.closeQuietly with a FileUtils.deleteQuietly or removeHardLink
to more clearly communicate intent, try to delete it, move it to a tmp location if failure,
and then either periodically retry delete on the links or remove them at shutdown.

> 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
>            Assignee: Joshua McKenzie
>              Labels: compaction
>             Fix For: 2.0.6
>
>         Attachments: leakdetect.patch, 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:
> {code:title=RandomAccessReader.java|borderStyle=solid}
> @Override
> protected void finalize() throws Throwable {
> 	deallocate();
> 	super.finalize();
> }
> {code}
> Can somebody test / develop / patch it? Thx.



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