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From "Jim Newsham (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4050) cassandra unnecessarily holds file locks on snapshot files
Date Thu, 15 Mar 2012 04:31:58 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13229883#comment-13229883
] 

Jim Newsham commented on CASSANDRA-4050:
----------------------------------------

Yeah I'm starting to think that might be true -- unfortunately.  I haven't found anything
definitive, but the following postings imply a hardlink cannot be deleted while another hardlink
to the same file is locked:

http://superuser.com/questions/387136/is-it-possible-to-delete-a-hardlink-to-a-locked-file
http://superuser.com/questions/301303/one-hardlink-is-locked-how-do-i-remove-the-other

Perhaps the data structure that records the lock is in the file object and not the hardlink
object.
                
> cassandra unnecessarily holds file locks on snapshot files
> ----------------------------------------------------------
>
>                 Key: CASSANDRA-4050
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4050
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 1.0.8
>         Environment: Windows 7
>            Reporter: Jim Newsham
>            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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