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https://issues.apache.org/jira/browse/ZOOKEEPER-536?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12760092#action_12760092
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Erik Holstad commented on ZOOKEEPER-536:
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I think it would be possible to take the same approach as I did in
https://issues.apache.org/jira/browse/ZOOKEEPER-472,
to instantiate the hashmap, when the first watcher is set. For both issues I
guess it might make sense to create a smaller
map when actually instantiating too, maybe 8 or so.
Erik
> the initial size of the hashsets for the watcher is too large
> -------------------------------------------------------------
>
> Key: ZOOKEEPER-536
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-536
> Project: Zookeeper
> Issue Type: Improvement
> Reporter: Benjamin Reed
>
> setting a watches on a lot of different nodes can be expensive if there is
> only one watch set on each node. by default the hashset we use to track
> watches has 16 entries and takes up about 160 bytes. we should probably make
> the initial size much lower.
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