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https://issues.apache.org/jira/browse/ZOOKEEPER-1781?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Hunt updated ZOOKEEPER-1781:
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Assignee: Takashi Ohnishi
> ZooKeeper Server fails if snapCount is set to 1
> ------------------------------------------------
>
> Key: ZOOKEEPER-1781
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1781
> Project: ZooKeeper
> Issue Type: Bug
> Components: quorum
> Affects Versions: 3.4.5
> Reporter: Takashi Ohnishi
> Assignee: Takashi Ohnishi
> Priority: Minor
> Fix For: 3.4.6, 3.5.0
>
> Attachments: ZOOKEEPER-1781.patch, ZOOKEEPER-1781.patch
>
>
> If snapCount is set to 1, ZooKeeper Server can start but it fails with the
> below error:
> 2013-10-02 18:09:07,600 [myid:1] - ERROR
> [SyncThread:1:SyncRequestProcessor@151] - Severe unrecoverable error, exiting
> java.lang.IllegalArgumentException: n must be positive
> at java.util.Random.nextInt(Random.java:300)
> at
> org.apache.zookeeper.server.SyncRequestProcessor.run(SyncRequestProcessor.java:93)
> In source code, it maybe be supposed that snapCount must be 2 or more:
> {code:title=org.apache.zookeeper.server.SyncRequestProcessor.java|borderStyle=solid}
> 91 // we do this in an attempt to ensure that not all ofthe
> servers
> 92 // in the ensemble take a snapshot at the same time
> 93 int randRoll = r.nextInt(snapCount/2);
> {code}
> I think this supposition is not bad because snapCount = 1 is not realistic
> setting...
> But, it may be better to mention this restriction in documentation or add a
> validation in the source code.
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