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From "Joshua McKenzie (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4050) Unable to remove snapshot files on Windows while original sstables are live
Date Mon, 17 Mar 2014 21:58:49 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13938446#comment-13938446
] 

Joshua McKenzie commented on CASSANDRA-4050:
--------------------------------------------

After changing RAF over to nio.2-based I'm still seeing snapshot deletion errors.  A little
digging turned up:
http://bugs.java.com/view_bug.do?bug_id=4715154

As this applies to deleting memory mapped files but not necessarily hard-links with memory
mapped segments in the original I figured I'd test it.  I've confirmed that if the original
file has any data that's in a MappedByteBuffer even if the original RAF it was associated
with is closed, Windows refuses to delete the hard-link.

Some local logging indicates that we have MmappedSegmentedFile Segments open on the original
keyspaces in question when deletion is attempted which isn't surprising.  The following implies
that there *might* be a way around this but it involves turning off all page caching for these
files which isn't what we want for SSTableReaders on Windows: http://www.osronline.com/showThread.cfm?link=64732

> Unable to remove snapshot files on Windows while original sstables are live
> ---------------------------------------------------------------------------
>
>                 Key: CASSANDRA-4050
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4050
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: Windows 7
>            Reporter: Jim Newsham
>            Assignee: Joshua McKenzie
>            Priority: Minor
>
> I'm using Cassandra 1.0.8, on Windows 7.  When I take a snapshot of the database, I find
that I am unable to delete the snapshot directory (i.e., dir named "{datadir}\{keyspacename}\snapshots\{snapshottag}")
while Cassandra is running:  "The action can't be completed because the folder or a file in
it is open in another program.  Close the folder or file and try again" [in Windows Explorer].
 If I terminate Cassandra, then I can delete the directory with no problem.
> I expect to be able to move or delete the snapshotted files while Cassandra is running,
as this should not affect the runtime operation of Cassandra.



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