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Posted to issues@drill.apache.org by "Arina Ielchiieva (JIRA)" <ji...@apache.org> on 2016/09/13 17:30:20 UTC

[jira] [Created] (DRILL-4888) putIfAbsent for ZK stores is not atomic

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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