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From "dafu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HELIX-74) handling large number of watchers during session re-establishment
Date Wed, 27 Mar 2013 23:29:15 GMT
dafu created HELIX-74:

             Summary: handling large number of watchers during session re-establishment
                 Key: HELIX-74
                 URL: https://issues.apache.org/jira/browse/HELIX-74
             Project: Apache Helix
          Issue Type: Bug
            Reporter: dafu
            Assignee: dafu

due to this zk bug:

we can't handling session re-establishment when watcher set size on zk client side goes beyond
1M. we need at 2 things:
1) add watcher size monitoring mechanism, log warnings when watcher set size goes beyond 1M.
this could be done through reflection on zk-connection

2) reduce number of watchers helix needs. one possible solution is to register only one watcher
on parent node and every time we change a znode under the parent node, we touch the parent

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