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From "Thomas Scott (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11721) When Standby NameNode is paused using kill -SIGSTOP clients hang rather than moving to the active.
Date Tue, 02 May 2017 11:38:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15992751#comment-15992751
] 

Thomas Scott commented on HDFS-11721:
-------------------------------------

[~andrew.wang] Hadoop version is 2.6.0 from CDH5.8.5. We have also been able to reproduce
this on a CDH5.10 environment. In our reproduction the ipc.client.rpc-timeout.ms was default
0 but no exception or timeout message was seen. I observed this hanging for 15mins+ and, as
soon as the SBNN is resumed the client continued and switched to the Active NN (as observed
by: "Operation category READ is not supported in state standby. Visit https://s.apache.org/sbnn-error
").

> When Standby NameNode is paused using kill -SIGSTOP clients hang rather than moving to
the active.
> --------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-11721
>                 URL: https://issues.apache.org/jira/browse/HDFS-11721
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs-client
>            Reporter: Thomas Scott
>            Priority: Minor
>
> Using kill -SIGSTOP on the standby namenode causes clients to hang rather than moving
to the active. To reproduce:
> 1. Run kill -SIGSTOP <SBNN pid>
> 2. Run hdfs dfs -ls / (this may not show the issue as it may try the active namenode
first. If this happens, failover the NameNodes and the issue will occur)
> 3. To force the issue run hdfs dfs -ls hdfs://<sbnn ip>:8020/ 
> This causes the client to hang with no timeout until the SBNN is resumed.



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