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https://issues.apache.org/jira/browse/HDFS-14914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16955301#comment-16955301
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Fengnan Li commented on HDFS-14914:
-----------------------------------
[~chaosun] [~xkrogen] [~inigoiri] Please take a look and let me know your
thoughts.
> Observer should throw StandbyException in Safemode
> --------------------------------------------------
>
> Key: HDFS-14914
> URL: https://issues.apache.org/jira/browse/HDFS-14914
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: Fengnan Li
> Assignee: Fengnan Li
> Priority: Minor
> Attachments: HDFS-14914-001.patch
>
>
> When observer is in safemode, calling getBlockLocations will make it throw
> RetriableException as in
> [HDFS-13898|https://issues.apache.org/jira/browse/HDFS-13898]. However,
> during startup the safemode is taking a really long time and retry would not
> help much here.
> What makes it worse is that when Routers talking to Observers, since Router
> distinguishes StandbyException and RetriableException, it will keep retry
> (default 3) times and then return to the client an RetriableException. The
> client will retry again on the same Router and to the same Observer for
> default 10 times, resulting in 3 * 10 = 30 retries per call.
> The change is to make it failover so that Router can immediately try another
> Observer or Active namenode (depends on the design). The current
> ObserverReadProxyProvider doesn't get affected since both RetriableException
> and StandbyException will make it failover.
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