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From "Mike Drob (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-1454) Need good way to perform a rolling restart of all tablet servers
Date Wed, 22 May 2013 21:38:19 GMT
Mike Drob created ACCUMULO-1454:
-----------------------------------

             Summary: Need good way to perform a rolling restart of all tablet servers
                 Key: ACCUMULO-1454
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-1454
             Project: Accumulo
          Issue Type: Improvement
          Components: tserver
    Affects Versions: 1.4.3, 1.5.0
            Reporter: Mike Drob


When needing to change a tserver parameter (e.g. java heap space) across the entire cluster,
there is not a graceful way to perform a rolling restart.

The naive approach of just killing tservers one at a time causes a lot of churn on the cluster
as tablets move around and zookeeper tries to maintain current state.

Potential solutions might be via a fancy fate operation, with coordination by the master.
Ideally, the master would know which servers are 'safe' to restart and could minimize overall
impact during the operation.

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