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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12075) Preemptive Fast Fail
Date Fri, 26 Sep 2014 18:30:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14149770#comment-14149770
] 

Ted Yu commented on HBASE-12075:
--------------------------------

>From console:
{code}
file locks                      (-x) unlimited
/home/jenkins/jenkins-slave/workspace/PreCommit-HBASE-Build/dev-support/test-patch.sh: line
685: 32417 Killed                  $MVN clean test -P runAllTests -D${PROJECT_NAME}PatchProcess
We're ok: there is no zombie test
{code}
Looks like no tests were run.

> 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: 1.0.0
>            Reporter: Manukranth Kolloju
>            Assignee: Manukranth Kolloju
>             Fix For: 1.0.0
>
>         Attachments: 0001-Add-a-test-case-for-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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