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From Joe Littlejohn <>
Subject Memory leak when using service providers
Date Tue, 29 Apr 2014 10:55:55 GMT

I've observed a memory leak in our production system using Curator service
discovery. I can replicate the problem with 2.4.1 and 2.4.2, though I
haven't tested any older versions.

This test shows the problem:

(Hopefully this test is enough to demonstrate the problem. I haven't used
the TestingServer so you'll need a zk instance with a registered service.)

If you run it and watch the process with jvisualvm you'll see that the heap
grows and grows as the test is running. Taking a heap dump will reveal
thousands of ServiceInstance and ServiceCacheImpl instances that are
retained even though the provider is closed after each usage. The
references appear to be traced back to the PathChildrenCache. I realise
it's possible to retain ServiceProvider instances, but this appears to be a
leak that shouldn't occur if the provider is correctly closed each time.

Can anyone comment on whether this is indeed a problem? Am I missing


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