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https://issues.apache.org/jira/browse/CURATOR-14?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13706715#comment-13706715
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Ioannis Canellos commented on CURATOR-14:
-----------------------------------------
A specific path can have more than one Watchers, so the path doesn't make a
good key.
Ideally, the maps could be combined in one MultiMap<String, Watcher> with soft
values, but I couldn't find such implementation, So I used a
Multimap<String,String> and a Cache<String, Watcher> with soft values and used
a UUID for correlation. I preferred Cache instead of a second Map so that I can
use a RemovalListener that would remove entries from the Multimap when they are
garbage collected from the Cache.
> Memory leak in Curator watches
> ------------------------------
>
> Key: CURATOR-14
> URL: https://issues.apache.org/jira/browse/CURATOR-14
> Project: Apache Curator
> Issue Type: New Feature
> Components: Recipes
> Affects Versions: 2.0.0-incubating
> Reporter: Brandon Beck
> Priority: Minor
> Attachments: CURATOR-14-dispatchingwatcher.patch,
> CURATOR-14-draft-2.patch, CURATOR-14-draft-3.patch, CURATOR-14.patch,
> MemoryTest.java
>
>
> The JVM runs out of memory if you repetitively create a PathChildrenCache,
> start it then immediately stop it. It appears that the memory is taken up by
> a watch that isn't ever cleaned up. Curator attempts to do some pooling of
> watches, but doesn't seem to use the path in the pooling.
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