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From "Joshua McKenzie (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6283) Windows 7 data files kept open / can't be deleted after compaction.
Date Mon, 07 Apr 2014 21:44:16 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6283?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13962297#comment-13962297
] 

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

I originally got the idea from the SSTableDeletingTask implementation (as mentioned prior)
but that works too.

As of CASSANDRA-6907 we currently have snapshot-based repair disabled for Windows in 2.0.7+,
so do we even need to disable the mmap'ed I/O path on Windows prior to optimizing buffered
I/O and removing mmap as an option?

> Windows 7 data files kept 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: 2.0.7
>
>         Attachments: 6283_StreamWriter_patch.txt, leakdetect.patch, neighbor-log.zip,
root-log.zip, 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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