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https://issues.apache.org/jira/browse/IGNITE-9384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16608548#comment-16608548
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ASF GitHub Bot commented on IGNITE-9384:
----------------------------------------
GitHub user agura opened a pull request:
https://github.com/apache/ignite/pull/4707
IGNITE-9384 Transaction status can be set incorrectly due to a race on
prepare phase
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/agura/incubator-ignite ignite-9384
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/ignite/pull/4707.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 #4707
----
commit b14943f33dea9e998ea6d5a9c2570d60d16458d2
Author: agura <agura@...>
Date: 2018-09-09T19:21:36Z
IGNITE-9384 Transaction status can be set incorrectly due to a race on
prepare phase
----
> Transaction state PREPARED may be set too early or too late
> -----------------------------------------------------------
>
> Key: IGNITE-9384
> URL: https://issues.apache.org/jira/browse/IGNITE-9384
> Project: Ignite
> Issue Type: Bug
> Reporter: Alexey Goncharuk
> Assignee: Andrey Gura
> Priority: Major
> Fix For: 2.7
>
>
> I see the following issues in the {{GridDhtTxPrepareFutureAdapter}} class:
> 1) {{PREPARED}} state on near local transaction may be set during the future
> completion. I think the {{onComplete(res)}} method should be corrected as
> follows:
> {code}
> if (last || tx.isSystemInvalidate() && !(tx.near() && tx.local()))
> tx.state(PREPARED);
> ...
> {code}
> 2) In {{onDone}} we have the following code:
> {code}
> if (REPLIED_UPD.compareAndSet(this, 0, 1)) {
> GridNearTxPrepareResponse res =
> createPrepareResponse(this.err);
> try {
> sendPrepareResponse(res);
> }
> finally {
> // Will call super.onDone().
> onComplete(res);
> }
> return true;
> }
> ...
> {code}
> This code will send near prepare response to the near node before the local
> DHT transaction sets it's state to {{PREPARED}} which violates the invariant
> that all transactions are prepared before any of the transactions is
> committed. I think these two methods should be swapped, but we need to
> carefully check the error handling (note that {{onComplete}} is called in
> {{finally}} block).
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