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Posted to common-issues@hadoop.apache.org by "Peng Zhang (JIRA)" <ji...@apache.org> on 2015/01/04 10:11:35 UTC
[jira] [Commented] (HADOOP-10584) ActiveStandbyElector goes down if
ZK quorum become unavailable
[ https://issues.apache.org/jira/browse/HADOOP-10584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14263809#comment-14263809 ]
Peng Zhang commented on HADOOP-10584:
-------------------------------------
I met the similar error for YARN RM that enabled HA automatic-failover.
{noformat}
2015-01-04,12:42:30,682 FATAL org.apache.hadoop.ha.ActiveStandbyElector: Received stat error from Zookeeper. code:CONNECTIONLOSS. Not retrying further znode monitoring connection errors.
2015-01-04,12:42:30,886 INFO org.apache.zookeeper.ZooKeeper: Session: 0x2498936f2a8c448 closed
2015-01-04,12:42:30,888 INFO org.apache.zookeeper.ClientCnxn: EventThread shut down
2015-01-04,12:42:30,888 FATAL org.apache.hadoop.yarn.server.resourcemanager.ResourceManager: Received a org.apache.hadoop.yarn.server.resourcemanager.RMFatalEvent of type EMBEDDED_ELECTOR_FAILED. Cause:
Received stat error from Zookeeper. code:CONNECTIONLOSS. Not retrying further znode monitoring connection errors.
2015-01-04,12:42:30,891 INFO org.apache.hadoop.util.ExitUtil: Exiting with status 1
{noformat}
> 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
>
>
> 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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