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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12075) Preemptive Fast Fail
Date Sat, 04 Oct 2014 03:53:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14158930#comment-14158930
] 

stack commented on HBASE-12075:
-------------------------------

I don't think is going to fly in ClusterConnection [~manukranthk]

+  public RetryingCallerInterceptor getRetryingCallerInterceptor();

Fellas have been working on cleaning up the API making it regular, understandable.  Inserting
the above is going to stick out like a sore thumb IMO.

It doesn't even have javadoc.

Reading more I get it.

The factories and the notion are sound.  Makes sense.  How to reveal it w/o disturbing ClusterConnection?
Can you insert an implementation of ClusterConnection that has getRetryingCallerInterceptor?
 Or you want us to add a DevelopersClusterConnection marker Interface to CC or add a 'features'
or dev tools method that you could get your RetryingCallerInterceptor from?

Adding [~sduskis] and [~enis] and [~ndimiduk]... These fellas weill have better ideas than
I.





> Preemptive Fast Fail
> --------------------
>
>                 Key: HBASE-12075
>                 URL: https://issues.apache.org/jira/browse/HBASE-12075
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Client
>    Affects Versions: 0.99.0, 2.0.0, 0.98.6.1
>            Reporter: Manukranth Kolloju
>            Assignee: Manukranth Kolloju
>         Attachments: 0001-Add-a-test-case-for-Preemptive-Fast-Fail.patch, 0001-HBASE-12075-Implement-Preemptive-Fast-Fail.patch,
0001-HBASE-12075-Implement-Preemptive-Fast-Fail.patch, 0001-Implement-Preemptive-Fast-Fail.patch,
0001-Implement-Preemptive-Fast-Fail.patch, 0001-Implement-Preemptive-Fast-Fail.patch, 0001-Implement-Preemptive-Fast-Fail.patch,
0001-Implement-Preemptive-Fast-Fail.patch
>
>
> In multi threaded clients, we use a feature developed on 0.89-fb branch called Preemptive
Fast Fail. This allows the client threads which would potentially fail, fail fast. The idea
behind this feature is that we allow, among the hundreds of client threads, one thread to
try and establish connection with the regionserver and if that succeeds, we mark it as a live
node again. Meanwhile, other threads which are trying to establish connection to the same
server would ideally go into the timeouts which is effectively unfruitful. We can in those
cases return appropriate exceptions to those clients instead of letting them retry.



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