accumulo-notifications mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Keith Turner (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-671) Create utility to re-initialize just ZooKeeper from existing Accumulo install
Date Thu, 12 Sep 2013 23:15:52 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13765996#comment-13765996
] 

Keith Turner commented on ACCUMULO-671:
---------------------------------------

I thought this would be fairly straight forward, then I realized there is one hitch.  All
of the users data is in HDFS, but there is one important thing in zookeeper that ties it all
together and thats the pointer to the root tables walogs.  I was talking to [~ctubbsii] about
this issue and he suggested analyzing the walogs to determine which are needed.  I think this
would be a feasible approach.  Create a map reduce job that reads all the walogs and determines
which walogs are currently needed by a tablet.  Re-initialization would look like the following.

 # run job to analyze walog and determine which ones are currently needed by root table
 # accumulo init --reinitZookeeper <root table walogs>

                
> Create utility to re-initialize just ZooKeeper from existing Accumulo install
> -----------------------------------------------------------------------------
>
>                 Key: ACCUMULO-671
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-671
>             Project: Accumulo
>          Issue Type: New Feature
>          Components: master
>            Reporter: Krishmin Rai
>            Priority: Minor
>
> In a case where ZooKeeper data is lost but the Accumulo footprint in HDFS still exists,
it would be nice to be able to properly re-initialize just ZooKeeper (to the extent possible).
> See [mailing list|http://mail-archives.apache.org/mod_mbox/accumulo-user/201207.mbox/%3CCAGUtCHrfNCApFb5iAVJX9R%3DuzwP5zT7FHw7zBrytMQwH1voJcw%40mail.gmail.com%3E]
for discussion

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira

Mime
View raw message