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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12075) Preemptive Fast Fail
Date Fri, 03 Oct 2014 22:02:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14158584#comment-14158584
] 

Hadoop QA commented on HBASE-12075:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest attachment 
  http://issues.apache.org/jira/secure/attachment/12671882/0001-HBASE-12075-Implement-Preemptive-Fast-Fail.patch
  against trunk revision .
  ATTACHMENT ID: 12671882

    {color:green}+1 @author{color}.  The patch does not contain any @author tags.

    {color:green}+1 tests included{color}.  The patch appears to include 8 new or modified
tests.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javac{color}.  The applied patch does not increase the total number of
javac compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any warning messages.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new Findbugs (version
2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase the total number
of release audit warnings.

    {color:green}+1 lineLengths{color}.  The patch does not introduce lines longer than 100

  {color:green}+1 site{color}.  The mvn site goal succeeds with this patch.

     {color:red}-1 core tests{color}.  The patch failed these unit tests:
                       org.apache.hadoop.hbase.replication.regionserver.TestRegionReplicaReplicationEndpointNoMaster
                  org.apache.hadoop.hbase.master.TestDistributedLogSplitting

     {color:red}-1 core zombie tests{color}.  There are 1 zombie test(s): 	at org.apache.hadoop.hbase.master.TestMasterNoCluster.testNotPullingDeadRegionServerFromZK(TestMasterNoCluster.java:306)

Test results: https://builds.apache.org/job/PreCommit-HBASE-Build/11209//testReport/
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11209//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11209//artifact/patchprocess/newPatchFindbugsWarningshbase-prefix-tree.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11209//artifact/patchprocess/newPatchFindbugsWarningshbase-examples.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11209//artifact/patchprocess/newPatchFindbugsWarningshbase-server.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11209//artifact/patchprocess/newPatchFindbugsWarningshbase-common.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11209//artifact/patchprocess/newPatchFindbugsWarningshbase-protocol.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11209//artifact/patchprocess/newPatchFindbugsWarningshbase-client.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11209//artifact/patchprocess/newPatchFindbugsWarningshbase-thrift.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11209//artifact/patchprocess/newPatchFindbugsWarningshbase-hadoop2-compat.html
Findbugs warnings: https://builds.apache.org/job/PreCommit-HBASE-Build/11209//artifact/patchprocess/newPatchFindbugsWarningshbase-annotations.html
Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/11209//console

This message is automatically generated.

> 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-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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