Fengnan Li created HDFS-14914:
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Summary: 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
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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