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From "Eric Newton (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-2757) zookeeper watches
Date Tue, 29 Apr 2014 18:32:17 GMT
Eric Newton created ACCUMULO-2757:
-------------------------------------

             Summary: zookeeper watches
                 Key: ACCUMULO-2757
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-2757
             Project: Accumulo
          Issue Type: Improvement
          Components: client, master, tserver
         Environment: very large clusters
            Reporter: Eric Newton


I recently learned how to get the number of watches in a zookeeper node.

{noformat}
$ echo wchp | nc localhost 2181
{noformat}

There are a surprising number of watches supporting table configuration.  A single tserver
accumulo instance with one data table is using 872 watches.  Large clusters, even with many
zookeepers, can have millions of watches.

We may need to watch a single notification node, or serialize the table configs into a single
node per table.  That would accomplish ACCUMULO-1568, too.



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