Arina Ielchiieva created DRILL-4888:
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Summary: putIfAbsent for ZK stores is not atomic
Key: DRILL-4888
URL: https://issues.apache.org/jira/browse/DRILL-4888
Project: Apache Drill
Issue Type: Bug
Affects Versions: 1.8.0
Reporter: Arina Ielchiieva
Assignee: Arina Ielchiieva
Fix For: 1.9.0
putIfAbsent method in ZookeeperPersistentStore [1] and ZkEphemeralStore [2] is
not atomic. First is checks if znode is absent and then puts data into it, but
by that time someone might have created znode.
[1]
https://github.com/apache/drill/blob/master/exec/java-exec/src/main/java/org/apache/drill/exec/store/sys/store/ZookeeperPersistentStore.java#L89
[2]
https://github.com/apache/drill/blob/master/exec/java-exec/src/main/java/org/apache/drill/exec/coord/zk/ZkEphemeralStore.java#L90
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