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https://issues.apache.org/jira/browse/CASSANDRA-4050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13939831#comment-13939831
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Jonathan Ellis commented on CASSANDRA-4050:
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bq. I'd like to drop the mapped i/o separately
WFM.
bq. do we have perf #'s from when we added the memory mapped i/o into the
code-path
It was a long time ago (CASSANDRA-408, CASSANDRA-669). It was a pretty big win
at the time (10%? 20%?) because we were basically doing zero-copy reads from
the mapped buffers. The problem is that we had to give that up when we started
manually unmapping obsolete sstables (CASSANDRA-2521) -- too hard to push
refcounting all the way up the read path, so we gave up and just copy to a new
buffer after all.
> 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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