[jira] [Created] (SAMZA-2044) EOSMessage causes out of memory Exceptions related to WindowOperatorImpl

["Peter Georgantas (JIRA)" <ji...@apache.org>]

Peter Georgantas created SAMZA-2044:
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             Summary: EOSMessage causes out of memory Exceptions related to WindowOperatorImpl
                 Key: SAMZA-2044
                 URL: https://issues.apache.org/jira/browse/SAMZA-2044
             Project: Samza
          Issue Type: Bug
          Components: container
    Affects Versions: 0.14.0, 1.0
            Reporter: Peter Georgantas


The contract of the handleEndOfStream method dictates that a collection of results be returned. In the case of WindowOperatorImpl which has a backing RocksDB store, this effectively causes the entirety of the store to be pulled into memory. In many cases, this will cause out of memory exceptions (otherwise why not keep the store in memory in the first place).

 

Since this is a protected api, I have a relatively simple change to propose which could allow data to be consumed downstream as it is brought out of the store:



{{protected void handleEndOfStream(Consumer<WindowPane<K, Object>> consumer, MessageCollector collector, TaskCoordinator coordinator) { ... }}}



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