GitHub user phrocker opened a pull request:
https://github.com/apache/accumulo/pull/60
ACCUMULO-3509: Allow cleanup state to be kept to avoid blocking tservâ¦
â¦er session sweep
By enabling state ( true/false) from the cleanup method, the change will
avoid blocking
on a scan session being swept. if the session cleanup blocks because a
ScanSession is
still being read, we may block until the ScanBatch returns for that
ScanSession.
The change uses a simple semaphore ( purely because I like the word ) to
attempt acquisition.
If that fails, we return false from the cleanup and reintroduce that
Session back into
the queue to clean up.
Added unit test that in the error condition will show the missing scan
sessions ( which are missing due to the cleanup being blocked)
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/phrocker/accumulo-1 master
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/accumulo/pull/60.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #60
----
commit bbd2257a001d654a87b433bb387ad9fce402dbb8
Author: phrocker <[email protected]>
Date: 2015-12-31T15:16:49Z
ACCUMULO-3509: Allow cleanup state to be kept to avoid blocking tserver
session sweep
By enabling state ( true/false) from the cleanup method, the change will
avoid blocking
on a scan session being swept. if the session cleanup blocks because a
ScanSession is
still being read, we may block until the ScanBatch returns for that
ScanSession.
The change uses a simple semaphore ( purely because I like the word ) to
attempt acquisition.
If that fails, we return false from the cleanup and reintroduce that
Session back into
the queue to clean up.
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