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https://issues.apache.org/jira/browse/HBASE-5397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13210075#comment-13210075
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Hudson commented on HBASE-5397:
-------------------------------
Integrated in HBase-TRUNK-security #113 (See
[https://builds.apache.org/job/HBase-TRUNK-security/113/])
hbase-5397. performance.xml, configuration.xml - correction to ZK config.
(Revision 1245199)
Result = FAILURE
> [book] zookeeper quorum mistake
> -------------------------------
>
> Key: HBASE-5397
> URL: https://issues.apache.org/jira/browse/HBASE-5397
> Project: HBase
> Issue Type: Bug
> Reporter: Andre Medeiros
> Assignee: Doug Meil
> Priority: Minor
> Attachments: docbkx_hbase_5397.patch
>
>
> In Chapter 2, section 2.5 "ZooKeeper" under "How many ZooKeepers should I
> run?" there is the sentence
> *There can be no quorum if the number of members is an even number.*
> This is not true. In ZooKeeper, an even number of peers is supported, but it
> is normally not used because an even sized ensemble requires, proportionally,
> more peers to form a quorum than an odd sized ensemble requires. For example,
> an ensemble with 4 peers requires 3 to form a quorum, while an ensemble with
> 5 also requires 3 to form a quorum. Thus, an ensemble of 5 allows 2 peers to
> fail, and thus is more fault tolerant than the ensemble of 4, which allows
> only 1 down peer.
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