mck created CASSANDRA-12143:
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Summary: NPE when trying to remove purgable tombstones from result
Key: CASSANDRA-12143
URL: https://issues.apache.org/jira/browse/CASSANDRA-12143
Project: Cassandra
Issue Type: Bug
Reporter: mck
Assignee: mck
A cluster running 2.2.6 started throwing NPEs.
(500K exceptions on a node was seen.)
{noformat}WARN [SharedPool-Worker-5] 2016-06-29 00:46:15,708
AbstractLocalAwareExecutorService.java:169 - Uncaught exception on thread
Thread[SharedPool-Worker-5,5,main]: {}
java.lang.NullPointerException: null{noformat}
Bisecting this highlighted commit d3db33c008542c7044f3ed8c19f3a45679fcf52e as
the culprit, which was a fix for CASSANDRA-11427.
This commit added a line to "remove purgable tombstones from result" but failed
to null check the {{data}} variable first. This variable comes from {{Row.cf}}
which is permitted to be null where the CFS has no data.
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