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