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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 Thu, 20 Feb 2014 23:17:27 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13907685#comment-13907685
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Joshua McKenzie commented on CASSANDRA-6283:
--------------------------------------------

As a final confirmation of this behavior I tested this locally.  I created and locked a file
named test.txt (opened it), and then hard linked and attempted to delete it.

C:\Users\jmckenzie\Desktop\FileLocker>mklink /H link.txt test.txt
Hardlink created for link.txt <<===>> test.txt

C:\Users\jmckenzie\Desktop\FileLocker>del link.txt
C:\Users\jmckenzie\Desktop\FileLocker\link.txt
The process cannot access the file because it is being used by another process.

On Windows, if the original file is locked the hard link cannot be deleted even if it's not
in use.

I'll start prototyping a sweep and delete model.  We have some unit tests that are failing
on Windows with similar stacks to what Andreas is getting on startup so I'll look into those
along with this.

> 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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