[jira] [Commented] (ZOOKEEPER-1794) Add hash check to transaction history in quorum servers

["Hadoop QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ZOOKEEPER-1794?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13820353#comment-13820353 ] 

Hadoop QA commented on ZOOKEEPER-1794:
--------------------------------------

-1 overall.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12613347/ZOOKEEPER-1794.patch
  against trunk revision 1540961.

    +1 @author.  The patch does not contain any @author tags.

    +1 tests included.  The patch appears to include 6 new or modified tests.

    +1 javadoc.  The javadoc tool did not generate any warning messages.

    +1 javac.  The applied patch does not increase the total number of javac compiler warnings.

    -1 findbugs.  The patch appears to introduce 1 new Findbugs (version 1.3.9) warnings.

    +1 release audit.  The applied patch does not increase the total number of release audit warnings.

    +1 core tests.  The patch passed core unit tests.

    +1 contrib tests.  The patch passed contrib unit tests.

Test results: https://builds.apache.org/job/PreCommit-ZOOKEEPER-Build/1761//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-ZOOKEEPER-Build/1761//artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Console output: https://builds.apache.org/job/PreCommit-ZOOKEEPER-Build/1761//console

This message is automatically generated.

> Add hash check to transaction history in quorum servers
> -------------------------------------------------------
>
>                 Key: ZOOKEEPER-1794
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1794
>             Project: ZooKeeper
>          Issue Type: Sub-task
>          Components: quorum
>            Reporter: Germán Blanco
>            Assignee: Germán Blanco
>             Fix For: 3.5.0
>
>         Attachments: ZOOKEEPER-1794.patch
>
>   Original Estimate: 336h
>  Remaining Estimate: 336h
>
> The goal of this task is to add a hash number to each transaction in the transaction history. This hash number will depend on the entire transaction history. This hash number will be the same in all members of the quorum, since it shall have the same result if the members have the same transaction history. That means that there will be no need to send any new information between members of the quorum, during the broadcast phase. The hash number will be checked by the leader when learners try to connect, and it shall also be sent together with the snapshot during synchronisation. If the hash number does not match, the synchronisation shall be done with a snapshot in order to overwrite the conflicts in the transaction history.



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