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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-17251) Add a timeout parameter when locating region
Date Sun, 04 Dec 2016 13:28:58 GMT
Duo Zhang created HBASE-17251:
---------------------------------

             Summary: Add a timeout parameter when locating region
                 Key: HBASE-17251
                 URL: https://issues.apache.org/jira/browse/HBASE-17251
             Project: HBase
          Issue Type: Sub-task
          Components: asyncclient, Client
    Affects Versions: 2.0.0
            Reporter: Duo Zhang
             Fix For: 2.0.0


Now we always use the default timeout configured for zk and meta.

I think it is reasonable to always use the same timeout when accessing zk and meta as the
result will be shared by lots of threads. If we could do a successful fetching then the result
will be in cache so it does not make sense to set the timeout to a very small value when fetching.

But I think it is also important to let the user request finish in time even if the user can
only get a timeout exception. We should not block a user request longer than operation timeout.

So I think we could add a timeout parameter to the region locate method, and if the location
can not be fetched in time, we will just finished the returned CompletableFuture with a timeout
exception, but the actual fetching operation can still go on and use its own timeout config.



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