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https://issues.apache.org/jira/browse/ZOOKEEPER-3556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16937925#comment-16937925
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Alexander Shraer commented on ZOOKEEPER-3556:
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The described behavior is not a bug – currently reconfiguration requires
explicit action by an operator. One could implement automation on top. We
should consider this as a feature, since it sounds like several adopters have
implemented such automation. Perhaps one of them could contribute this upstream.
> Dynamic configuration file can not be updated automatically after some
> zookeeper servers of zk cluster are down
> ---------------------------------------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-3556
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3556
> Project: ZooKeeper
> Issue Type: Wish
> Components: java client
> Affects Versions: 3.5.5
> Reporter: Steven Chan
> Priority: Major
> Original Estimate: 12h
> Remaining Estimate: 12h
>
> *I encountered a problem which blocks my development of load balance using
> ZooKeeper 3.5.5.*
> *Actually, I have a ZooKeeper cluster which comprises of five zk servers.
> And the dynamic configuration file is as follows:*
> **
> {color:#FF0000} *server.1=zk1:2888:3888:participant;0.0.0.0:2181*{color}
> {color:#FF0000} *server.2=zk2:2888:3888:participant;0.0.0.0:2181*{color}
> {color:#FF0000} *server.3=zk3:2888:3888:participant;0.0.0.0:2181*{color}
> {color:#FF0000} *server.4=zk4:2888:3888:participant;0.0.0.0:2181*{color}
> {color:#FF0000} *server.5=zk5:2888:3888:participant;0.0.0.0:2181*{color}
> **
> *The zk cluster can work fine if every member works normally. However, if
> say two of them are suddenly down without previously being notified,*
> *the dynamic configuration file shown above will not be synchronized
> dynamically, which leads to the zk cluster fail to work normally.*
> *As far as I am concerned, the dynamic configuration file should be
> modified to this if server 1 and server 5 are down suddenly as follows:*
> {color:#FF0000} *server.2=zk2:2888:3888:participant;0.0.0.0:2181*{color}
> {color:#FF0000} *server.3=zk3:2888:3888:participant;0.0.0.0:2181*{color}
> {color:#FF0000} *server.4=zk4:2888:3888:participant;0.0.0.0:2181*{color}
> *But in this case, the dynamic configuration file will never change
> automatically unless you manually revise it.*
> *I think this is a very common case which may happen at any time. If so,
> how can we handle with it?*
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