[jira] [Created] (GEODE-2240) unexpected NullPointerException from Tombstone service

["Darrel Schneider (JIRA)" <ji...@apache.org>]

Darrel Schneider created GEODE-2240:
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             Summary: unexpected NullPointerException from Tombstone service
                 Key: GEODE-2240
                 URL: https://issues.apache.org/jira/browse/GEODE-2240
             Project: Geode
          Issue Type: Bug
          Components: regions
            Reporter: Darrel Schneider


A test failed and the logs were found to be full of NPEs from the tombstone service:[severe 2016/12/20 02:04:35.605 UTC dataStoregemfire7_rs-StorageBTTest-2016-12-19-23-35-42-client-14_19508 <Replicate/Partition Region Garbage Collector> tid=0x44] GemFire garbage collection service encountered an unexpected exception
java.lang.NullPointerException
        at org.apache.geode.internal.cache.TombstoneService$TombstoneSweeper.lambda$purgeObsoleteTombstones$1(TombstoneService.java:938)
        at org.apache.geode.internal.cache.TombstoneService$ReplicateTombstoneSweeper.removeExpiredIf(TombstoneService.java:479)
        at org.apache.geode.internal.cache.TombstoneService$TombstoneSweeper.removeIf(TombstoneService.java:823)
        at org.apache.geode.internal.cache.TombstoneService$TombstoneSweeper.purgeObsoleteTombstones(TombstoneService.java:937)
        at org.apache.geode.internal.cache.TombstoneService$TombstoneSweeper.run(TombstoneService.java:880)
        at java.lang.Thread.run(Thread.java:745)

[severe 2016/12/20 02:05:45.987 UTC dataStoregemfire7_rs-StorageBTTest-2016-12-19-23-35-42-client-14_19508 <Replicate/Partition Region Garbage Collector> tid=0x44] GemFire garbage collection service encountered an unexpected exception
java.lang.NullPointerException
        at org.apache.geode.internal.cache.TombstoneService$ReplicateTombstoneSweeper.expireBatch(TombstoneService.java:524)
        at org.apache.geode.internal.cache.TombstoneService$ReplicateTombstoneSweeper.checkExpiredTombstoneGC(TombstoneService.java:594)
        at org.apache.geode.internal.cache.TombstoneService$TombstoneSweeper.run(TombstoneService.java:878)
        at java.lang.Thread.run(Thread.java:745)

Both of these stacks indicate that the "expiredTombstones" ArrayList somehow has nulls in it. It is an ArrayList of Tombstone instances and the only code that adds to it first tests that the item it is adding is not null. The only other modify operation done on it is to remove an item.
Perhaps unsafe concurrent access is happening causing this code to see nulls.



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