[jira] [Updated] (CASSANDRA-4050) Rewrite RandomAccessReader to use FileChannel / nio to address Windows file access violations

["Joshua McKenzie (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-4050?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joshua McKenzie updated CASSANDRA-4050:
---------------------------------------
    Component/s: Local Write-Read Paths

> Rewrite RandomAccessReader to use FileChannel / nio to address Windows file access violations
> ---------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-4050
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4050
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Local Write-Read Paths
>         Environment: Windows 7
>            Reporter: Jim Newsham
>            Assignee: Joshua McKenzie
>            Priority: Minor
>              Labels: Windows
>             Fix For: 2.2.0 beta 1
>
>         Attachments: CASSANDRA-4050_v1.patch, CASSANDRA-4050_v2.patch, CASSANDRA-4050_v3.patch
>
>
> On Windows w/older java I/O libraries the files are not opened with FILE_SHARE_DELETE.  This causes problems as hard-links cannot be deleted while the original file is opened - our snapshots are a big problem in particular.  The nio library and FileChannels open with FILE_SHARE_DELETE which should help remedy this problem.
> Original text:
> 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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