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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HDFS-9119) Discrepancy between edit log tailing interval and RPC timeout for transitionToActive
Date Mon, 21 Sep 2015 22:24:04 GMT

     [ https://issues.apache.org/jira/browse/HDFS-9119?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Zhe Zhang reassigned HDFS-9119:
-------------------------------

    Assignee: Zhe Zhang

> Discrepancy between edit log tailing interval and RPC timeout for transitionToActive
> ------------------------------------------------------------------------------------
>
>                 Key: HDFS-9119
>                 URL: https://issues.apache.org/jira/browse/HDFS-9119
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: ha
>    Affects Versions: 2.7.1
>            Reporter: Zhe Zhang
>            Assignee: Zhe Zhang
>
> {{EditLogTailer}} on standby NameNode tails edits from active NameNode every 2 minutes.
But the {{transitionToActive}} RPC call has a timeout of 1 minute.
> If active NameNode encounters very intensive metadata workload (in particular, a lot
of {{AddOp}} and {{MkDir}} operations to create new files and directories), the amount of
updates accumulated in the 2 mins edit log tailing interval is hard for the standby NameNode
to catch up in the 1 min timeout window. If that happens, the FailoverController will timeout
and give up trying to transition the standby to active. The old ANN will resume adding more
edits. When the SbNN finally finishes catching up the edits and tries to become active, it
will crash.



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