[ 
https://issues.apache.org/jira/browse/HDFS-5776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13902288#comment-13902288
 ] 

Hadoop QA commented on HDFS-5776:
---------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest 
attachment 
  http://issues.apache.org/jira/secure/attachment/12629137/HDFS-5776v18.txt
  against trunk revision .

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

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

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

    {color:green}+1 javadoc{color}.  There were no new javadoc warning messages.

    {color:green}+1 eclipse:eclipse{color}.  The patch built with 
eclipse:eclipse.

    {color:green}+1 findbugs{color}.  The patch does not introduce any new 
Findbugs (version 1.3.9) warnings.

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

    {color:red}-1 core tests{color}.  The patch failed these unit tests in 
hadoop-hdfs-project/hadoop-hdfs:

                  org.apache.hadoop.hdfs.server.namenode.TestCacheDirectives

    {color:green}+1 contrib tests{color}.  The patch passed contrib unit tests.

Test results: 
https://builds.apache.org/job/PreCommit-HDFS-Build/6160//testReport/
Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/6160//console

This message is automatically generated.

> Support 'hedged' reads in DFSClient
> -----------------------------------
>
>                 Key: HDFS-5776
>                 URL: https://issues.apache.org/jira/browse/HDFS-5776
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs-client
>    Affects Versions: 3.0.0
>            Reporter: Liang Xie
>            Assignee: Liang Xie
>         Attachments: HDFS-5776-v10.txt, HDFS-5776-v11.txt, HDFS-5776-v12.txt, 
> HDFS-5776-v12.txt, HDFS-5776-v13.wip.txt, HDFS-5776-v14.txt, 
> HDFS-5776-v15.txt, HDFS-5776-v17.txt, HDFS-5776-v17.txt, HDFS-5776-v2.txt, 
> HDFS-5776-v3.txt, HDFS-5776-v4.txt, HDFS-5776-v5.txt, HDFS-5776-v6.txt, 
> HDFS-5776-v7.txt, HDFS-5776-v8.txt, HDFS-5776-v9.txt, HDFS-5776.txt, 
> HDFS-5776v18.txt
>
>
> This is a placeholder of hdfs related stuff backport from 
> https://issues.apache.org/jira/browse/HBASE-7509
> The quorum read ability should be helpful especially to optimize read outliers
> we can utilize "dfs.dfsclient.quorum.read.threshold.millis" & 
> "dfs.dfsclient.quorum.read.threadpool.size" to enable/disable the hedged read 
> ability from client side(e.g. HBase), and by using DFSQuorumReadMetrics, we 
> could export the interested metric valus into client system(e.g. HBase's 
> regionserver metric).
> The core logic is in pread code path, we decide to goto the original 
> fetchBlockByteRange or the new introduced fetchBlockByteRangeSpeculative per 
> the above config items.



--
This message was sent by Atlassian JIRA
(v6.1.5#6160)

Reply via email to