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Hudson commented on HBASE-5397: ------------------------------- Integrated in HBase-TRUNK #2665 (See [https://builds.apache.org/job/HBase-TRUNK/2665/]) 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira