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https://issues.apache.org/jira/browse/DRILL-4888?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Arina Ielchiieva resolved DRILL-4888.
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Resolution: Fixed
Fixed in scope of DRILL-4726.
Merged in Apache master with commit 89f2633f612a645666de8f51dcb19c6f8044a95e
> 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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