[jira] [Created] (SAMZA-45) NPE in linked list in samza-kv's CachedStore

["Chris Riccomini (JIRA)" <ji...@apache.org>]

Chris Riccomini created SAMZA-45:
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             Summary: NPE in linked list in samza-kv's CachedStore
                 Key: SAMZA-45
                 URL: https://issues.apache.org/jira/browse/SAMZA-45
             Project: Samza
          Issue Type: Bug
          Components: kv
    Affects Versions: 0.6.0
            Reporter: Chris Riccomini
            Assignee: Jay Kreps


Occasionally, I get an NPE from Samza when a job that uses samsa-kv. Here's a full stack trace.

{noformat}
java.lang.NullPointerException
	at scala.collection.mutable.DoubleLinkedListLike$class.remove(DoubleLinkedListLike.scala:55)
	at scala.collection.mutable.DoubleLinkedList.remove(DoubleLinkedList.scala:41)
	at org.apache.samza.storage.kv.CachedStore.put(CachedStore.scala:96)
	at org.apache.samza.storage.kv.KeyValueStorageEngine.put(KeyValueStorageEngine.scala:46)
	at org.apache.samza.test.integration.StatePerfTestTask.process(StatePerfTestTask.java:24)
	at org.apache.samza.container.TaskInstance.process(TaskInstance.scala:162)
	at org.apache.samza.container.SamzaContainer.process(SamzaContainer.scala:540)
	at org.apache.samza.container.SamzaContainer.run(SamzaContainer.scala:436)
	at org.apache.samza.job.local.ThreadJob$$anon$1.run(ThreadJob.scala:42)
{noformat}

I saved my Kafka logs (/tmp/kafka-logs) that trigger this (using StatePerfTask) running on a Kafka grid setup using hello-samza's bin/grid script. The logs are a bit too large (~75 megs) to attach to a JIRA.

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