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From "Vinod Kumar Vavilapalli (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-10584) ActiveStandbyElector goes down if ZK quorum become unavailable
Date Wed, 17 Jun 2015 22:02:01 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-10584?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Vinod Kumar Vavilapalli updated HADOOP-10584:
---------------------------------------------
    Target Version/s: 2.7.2  (was: 2.7.1)

Moving this to 2.7.2 after ack from Karthik.

bq. It does help. But in the patch, reJoinElection(0) is called, which will further call joinElectionInternal
..
bq. Since the ZK quorum is unavailable, we still have the same issue. The difference is that
with the patch we will retry 45s more(by using the default configuration).
Tx for pointing this out, [~xgong]. That still sounds bad though. IIRC, when we were originally
discussing the design of state-stores for RM, we were assuming that RM should give up on Zookeeper
only after trying for may be ~an hour. /cc [~jianhe]. Looking at the recent flow of tickets,
that doesn't seem to be the case?


> ActiveStandbyElector goes down if ZK quorum become unavailable
> --------------------------------------------------------------
>
>                 Key: HADOOP-10584
>                 URL: https://issues.apache.org/jira/browse/HADOOP-10584
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: ha
>    Affects Versions: 2.4.0
>            Reporter: Karthik Kambatla
>            Assignee: Karthik Kambatla
>            Priority: Critical
>         Attachments: hadoop-10584-prelim.patch, rm.log
>
>
> ActiveStandbyElector retries operations for a few times. If the ZK quorum itself is down,
it goes down and the daemons will have to be brought up again. 
> Instead, it should log the fact that it is unable to talk to ZK, call becomeStandby on
its client, and continue to attempt connecting to ZK.



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