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https://issues.apache.org/jira/browse/HBASE-20159?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16415720#comment-16415720
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Yu Li commented on HBASE-20159:
-------------------------------
We use {{hbase.client.zookeeper.quorum}} to identify the ZK nodes client should
connect, and if it's not set we will fallback to use {{hbase.zookeeper.quorum}}
just like before. The setting of {{hbase.client.zookeeper.observer.mode}} only
takes effect when {{hbase.client.zookeeper.quorum}} is set.
Back to your question, the former setting is correct when client ZK nodes in
observer mode, while the latter one is a mis-configuration
FWIW, here is a
[link|http://zookeeper.apache.org/doc/r3.4.6/zookeeperObservers.html] for more
details about zookeeper observer mode.
> Support using separate ZK quorums for client
> --------------------------------------------
>
> Key: HBASE-20159
> URL: https://issues.apache.org/jira/browse/HBASE-20159
> Project: HBase
> Issue Type: New Feature
> Reporter: Yu Li
> Assignee: Yu Li
> Priority: Major
> Attachments: HBASE-20159.patch, HBASE-20159.v2.patch,
> HBASE-20159.v3.patch
>
>
> Currently we are using the same zookeeper quorums for client and server,
> which makes us under risk that if some client connection boost exhausted
> zookeeper, RegionServer might abort due to zookeeper session loss. Actually
> we have suffered from this many times in production.
> Here we propose to allow client to use different ZK quorums, through below
> settings:
> {noformat}
> hbase.client.zookeeper.quorum
> hbase.client.zookeeper.property.clientPort
> hbase.client.zookeeper.observer.mode
> {noformat}
> The first two are for specifying client zookeeper properties, and the third
> one indicating whether the client ZK nodes are in observer mode. If the
> client ZK are not observer nodes, HMaster will take responsibility to
> synchronize necessary meta information (such as meta location and master
> address, etc.) from server to client ZK
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