[jira] [Assigned] (HBASE-19994) Create a new class for RPC throttling exception, make it retryable.

["huaxiang sun (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-19994?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

huaxiang sun reassigned HBASE-19994:
------------------------------------

    Assignee: huaxiang sun

> Create a new class for RPC throttling exception, make it retryable. 
> --------------------------------------------------------------------
>
>                 Key: HBASE-19994
>                 URL: https://issues.apache.org/jira/browse/HBASE-19994
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: huaxiang sun
>            Assignee: huaxiang sun
>            Priority: Minor
>
> Based on a discussion at dev mailing list.
>  
> {code:java}
> Thanks Andrew.
> +1 for the second option, I will create a jira for this change.
> Huaxiang
> On Feb 9, 2018, at 1:09 PM, Andrew Purtell <ap...@apache.org> wrote:
> We have
> public class ThrottlingException extends QuotaExceededException
> public class QuotaExceededException extends DoNotRetryIOException
> Let the storage quota limits throw QuotaExceededException directly (based
> on DNRIOE). That seems fine.
> However, ThrottlingException is thrown as a result of a temporal quota,
> so it is inappropriate for this to inherit from DNRIOE, it should inherit
> IOException instead so the client is allowed to retry until successful, or
> until the retry policy is exhausted.
> We are in a bit of a pickle because we've released with this inheritance
> hierarchy, so to change it we will need a new minor, or we will want to
> deprecate ThrottlingException and use a new exception class instead, one
> which does not inherit from DNRIOE.
> On Feb 7, 2018, at 9:25 AM, Huaxiang Sun <hs...@cloudera.com> wrote:
> Hi Mike,
>   You are right. For rpc throttling, definitely it is retryable. For storage quota, I think it will be fail faster (non-retryable).
>   We probably need to separate these two types of exceptions, I will do some more research and follow up.
>   Thanks,
>   Huaxiang
> On Feb 7, 2018, at 9:16 AM, Mike Drob <md...@apache.org> wrote:
> I think, philosophically, there can be two kinds of QEE -
> For throttling, we can retry. The quota is a temporal quota - you have done
> too many operations this minute, please try again next minute and
> everything will work.
> For storage, we shouldn't retry. The quota is a fixed quote - you have
> exceeded your allotted disk space, please do not try again until you have
> remedied the situation.
> Our current usage conflates the two, sometimes it is correct, sometimes not.
> On Wed, Feb 7, 2018 at 11:00 AM, Huaxiang Sun <hs...@cloudera.com> wrote:
> Hi Stack,
>  I run into a case that a mapreduce job in hive cannot finish because
> it runs into a QEE.
> I need to look into the hive mr task to see if QEE is not handled
> correctly in hbase code or in hive code.
> I am thinking that if  QEE is a retryable exception, then it should be
> taken care of by the hbase code.
> I will check more and report back.
> Thanks,
> Huaxiang
> On Feb 7, 2018, at 8:23 AM, Stack <st...@duboce.net> wrote:
> QEE being a DNRIOE seems right on the face of it.
> But if throttling, a DNRIOE is inappropriate. Where you seeing a QEE in a
> throttling scenario Huaxiang?
> Thanks,
> S
> {code}



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