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From "Joe Littlejohn (JIRA)" <>
Subject [jira] [Updated] (CURATOR-286) Memory leak in service discovery
Date Mon, 11 Jan 2016 12:40:40 GMT


Joe Littlejohn updated CURATOR-286:

Modified LeakTester that I used to reproduce the problem on a small scale.

> Memory leak in service discovery
> --------------------------------
>                 Key: CURATOR-286
>                 URL:
>             Project: Apache Curator
>          Issue Type: Bug
>          Components: Recipes
>    Affects Versions: 2.9.1
>            Reporter: Joe Littlejohn
>            Priority: Critical
>         Attachments:, curator-286.hprof.tar.gz
> Hi
> I'm seeing a memory leak in my application which makes use of service discovery.
> I've taken heap dumps and I see:
> * Hundreds of thousands of NamespaceWatcher instances. The client, actualWatcher and
curatorWatcher fields are all null, so these are closed NamespaceWatchers.
> * Thousands of PathChildrenCache instances. Each one has a 'path' value that refers to
one of the services I'm lookup up (using a service provider). The state fields shows that
all these PathChildrenCache instances are CLOSED.
> In my application I'm using a service provider to get an instance, then closing that
service provider. It seems that even after doing this, there's still a reference to the NamespaceWatcher
held in ZKWatchManager field childWatches (and this refers to the the PathChildrenCache.

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