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https://issues.apache.org/jira/browse/HBASE-25743?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17316530#comment-17316530
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Bharath Vissapragada commented on HBASE-25743:
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> The PR changes OPERATIONTIMEOUT to do retry? Is this a change in behavior? 

I just collapsed the case statements for CONNECTIONLOSS/OPERATIONTIMEOUT into a 
single one, no change in functionality? Did I miss something?

> Retry REQUESTTIMEOUT KeeperExceptions from ZK
> ---------------------------------------------
>
>                 Key: HBASE-25743
>                 URL: https://issues.apache.org/jira/browse/HBASE-25743
>             Project: HBase
>          Issue Type: Bug
>          Components: Zookeeper
>    Affects Versions: 3.0.0-alpha-1, 1.7.0, 2.5.0, 2.4.3, 2.3.6
>            Reporter: Bharath Vissapragada
>            Assignee: Bharath Vissapragada
>            Priority: Major
>
> Starting ZOOKEEPER-2251, client requests exceeding a timeout can throw a 
> KeeperException with REQUESTTIMEOUT opcode set. RecoverableZookeeper doesn't 
> transparently retry in such case. This was causing RS aborts when there is a 
> flaky ZK quorum member serving slow requests (especially in cases like 
> rolling upgrades and such).



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