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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-2925) Timestamp is not propagated to peer
Date Fri, 20 Jun 2014 01:26:26 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-2925?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14038230#comment-14038230
] 

ASF subversion and git services commented on ACCUMULO-2925:
-----------------------------------------------------------

Commit 4d7e90aeef3a6de6a36a30a188d5c1bc564ade3a in accumulo's branch refs/heads/master from
[~elserj]
[ https://git-wip-us.apache.org/repos/asf?p=accumulo.git;h=4d7e90a ]

ACCUMULO-2925 Add warning about server-assigned timestamps with replication

Leave a note about updates to equal keys that have different updates that are
assigned the same timestamp by the server.


> Timestamp is not propagated to peer
> -----------------------------------
>
>                 Key: ACCUMULO-2925
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-2925
>             Project: Accumulo
>          Issue Type: Bug
>          Components: replication
>            Reporter: Josh Elser
>            Assignee: Josh Elser
>            Priority: Blocker
>             Fix For: 1.7.0
>
>
> Wrote a test that was doing some more intense verification of equality of two tables
and I was surprised to find that the tables were in fact not equal.
> Digging into it some more, I eventually found that the keys and values were identical,
save for the timestamp. Despite the Mutations coming from the local WAL having timestamps
set by the server, these got lost.
> Specifically, the "real" timestamp is stored on the ServerMutation, not each ColumnUpdate.
On the peer, when the BatchWriter makes a shallow copy of the (Server)Mutation to apply on
the target table for replication, we lose that ServerMutation and get a "regular" Mutation
which has updates that don't have any timestamp set. If the BatchWriter didn't make the shallow
copy, this should work.



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