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From "Arina Ielchiieva (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-4888) putIfAbsent for ZK stores is not atomic
Date Tue, 13 Sep 2016 17:30:20 GMT
Arina Ielchiieva created DRILL-4888:

             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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