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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TEPHRA-270) Avoid transaction state cache refresh on co-procesor startup
Date Thu, 26 Apr 2018 00:13:00 GMT

    [ https://issues.apache.org/jira/browse/TEPHRA-270?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16453268#comment-16453268
] 

ASF GitHub Bot commented on TEPHRA-270:
---------------------------------------

GitHub user poornachandra opened a pull request:

    https://github.com/apache/incubator-tephra/pull/72

     TEPHRA-270  TEPHRA-271 Transaction state cache bug fixes 

    JIRA: https://issues.apache.org/jira/browse/TEPHRA-270
    https://issues.apache.org/jira/browse/TEPHRA-271
    
    This PR contains a couple of bug fixes for the Transaction state cache to fix race conditions
and deadlocks.


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/poornachandra/incubator-tephra feature/tx-state-cache

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/incubator-tephra/pull/72.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 #72
    
----
commit 73feed9a6a93d032c2e19e4e7d77fa4eb2065fcf
Author: poorna <poorna@...>
Date:   2018-04-25T23:51:56Z

    TEPHRA-270 Do not refresh the transaction state during co-processor startup to prevent
deadlocks

commit d42b282ec03c8e0d07bbb2a714961f2dd9b7641d
Author: poorna <poorna@...>
Date:   2018-04-25T23:58:22Z

    TEPHRA-271 Wait for the refresh thread to stop during shutdown to prevent race conditions

----


> Avoid transaction state cache refresh on co-procesor startup
> ------------------------------------------------------------
>
>                 Key: TEPHRA-270
>                 URL: https://issues.apache.org/jira/browse/TEPHRA-270
>             Project: Tephra
>          Issue Type: Improvement
>          Components: core
>            Reporter: Poorna Chandra
>            Assignee: Poorna Chandra
>            Priority: Major
>             Fix For: 0.14.0-incubating
>
>
> Transaction state cache, on startup, refreshes the transaction snapshot from HDFS. The
transaction state cache startup is called during HBase co-processor startup. The refresh of
the transaction snapshot can block, thus blocking the co-processor startup. 
> The subsequent transaction snapshot refreshes happen in the background. Also - there
is no guarantee that a snapshot will be present during the refresh on startup. Hence it is
okay not to refresh the snapshot during snapshot, but do it in background.



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