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From "Eric Newton (JIRA)" <>
Subject [jira] [Resolved] (ACCUMULO-2757) millions of zookeeper watches
Date Wed, 02 Jul 2014 15:20:25 GMT


Eric Newton resolved ACCUMULO-2757.

    Resolution: Later

Shelving this ticket until it's likely to be a real problem in the near future.

> millions of zookeeper watches
> -----------------------------
>                 Key: ACCUMULO-2757
>                 URL:
>             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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