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From "Duo Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17251) Add a timeout parameter when locating region
Date Thu, 08 Dec 2016 01:44:58 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15730765#comment-15730765
] 

Duo Zhang commented on HBASE-17251:
-----------------------------------

Fine. Let me commit the v1 patch.

> 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
>            Assignee: Duo Zhang
>             Fix For: 2.0.0
>
>         Attachments: HBASE-17251-v1.patch, HBASE-17251.patch
>
>
> 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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