[infinispan-issues] [JBoss JIRA] (ISPN-1796) Out-of-memory adding a lot of elements in cache with AsyncStore

[Andrew Pushkin (JIRA)]

Andrew Pushkin created ISPN-1796:
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             Summary: Out-of-memory adding a lot of elements in cache with AsyncStore
                 Key: ISPN-1796
                 URL: https://issues.jboss.org/browse/ISPN-1796
             Project: Infinispan
          Issue Type: Bug
          Components: Loaders and Stores, Locking and Concurrency
    Affects Versions: 5.1.0.CR3
         Environment: We plan to use Infinispan as a large distributed write-behind cache of terabytes of data, with a little fraction cached in RAM, so OOM is real threat for us.
            Reporter: Andrew Pushkin
            Assignee: Manik Surtani


OOM occure on peaks of putting objects in cache configured to use AsyncStore.

See Steps to Reproduce.
 
Profiling shows that the gc path is through AsyncStore.state field. 

The AsyncStore.executor initialized to ThreadPoolExecutor with DiscardPolicy to silently discard tasks if the queue is full, which delays async processing of entries in *state* map, which continues to grow.

Suggested solution.
Instead of DiscardPolicy use customized behavior, which is to estimate accumulated state size and (probably comparing it with modificationQueueSize) decide to discard or to block until it is processed.

The downside of suggested solution is the necessity to lock to estimate state size every time the task is rejected. Possibly it can be alleviated by increasing workingQueue size, so that it survive peaks without rejection.

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