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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13366) Throw DoNotRetryIOException instead of read only IOException
Date Tue, 31 Mar 2015 15:48:55 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14388732#comment-14388732
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Elliott Clark commented on HBASE-13366:
---------------------------------------

When are you seeing requests coming to a read only replica?
* If the requests are coming while a region is getting opened then we'll want the exceptions
to signal wait some time. In fact here it's really really important not to send a to no retry
exception as the read replicas are the best place to open a failed region. They already have
lots of the blocks in cache.
* If the requests are going to a read only replica just normally then there's a bug and we
should fix that.

> Throw DoNotRetryIOException instead of read only IOException
> ------------------------------------------------------------
>
>                 Key: HBASE-13366
>                 URL: https://issues.apache.org/jira/browse/HBASE-13366
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Liu Shaohui
>            Assignee: Liu Shaohui
>            Priority: Minor
>             Fix For: 2.0.0
>
>         Attachments: HBASE-13366-v1.diff
>
>
> Currently, the read only region just throws an IOException to the clients who send write
requests to it. This will cause the clients retry for configured times or until operation
timeout.
> Changing this exception to DoNotRetryIOException will make the client failed fast.
> Suggestions are welcomed~ Thanks



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