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https://issues.apache.org/jira/browse/TEZ-3972?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16617826#comment-16617826
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TezQA commented on TEZ-3972:
----------------------------
{color:red}-1 overall{color}. Here are the results of testing the latest
attachment
http://issues.apache.org/jira/secure/attachment/12940007/TEZ-3972.003.patch
against master revision 68f4cf9.
{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:red}-1 javac{color}. The applied patch generated 178 javac
compiler warnings (more than the master's current 177 warnings).
{color:green}+1 javadoc{color}. There were no new javadoc warning messages.
{color:green}+1 findbugs{color}. The patch does not introduce any new
Findbugs (version 3.0.1) warnings.
{color:green}+1 release audit{color}. The applied patch does not increase
the total number of release audit warnings.
{color:green}+1 core tests{color}. The patch passed unit tests in .
Test results:
https://builds.apache.org/job/PreCommit-TEZ-Build/2921//testReport/
Javac warnings:
https://builds.apache.org/job/PreCommit-TEZ-Build/2921//artifact/patchprocess/diffJavacWarnings.txt
Console output: https://builds.apache.org/job/PreCommit-TEZ-Build/2921//console
This message is automatically generated.
> Tez DAG can hang when a single task fails to fetch
> --------------------------------------------------
>
> Key: TEZ-3972
> URL: https://issues.apache.org/jira/browse/TEZ-3972
> Project: Apache Tez
> Issue Type: Bug
> Affects Versions: 0.9.1
> Reporter: Kuhu Shukla
> Assignee: Kuhu Shukla
> Priority: Major
> Attachments: TEZ-3972.001.patch, TEZ-3972.002.patch,
> TEZ-3972.003.patch
>
>
> Description of the hung DAG:
> A DAG with 2 vertices. {{Map}} Vertex has 22k maps, downstream vertex
> {{Reduce}} has 1009 tasks. All tasks succeed but one, which hangs. This one
> task (attempt) is doing a local fetch from a node that (now) has a bad disk.
> It fails to fetch and reports to the AM for the offending input attempt
> identifiers. However the AM does not schedule a re-run as
> {{uniquefailedOutputReports}} size is 1 (since only this task attempt failed
> to fetch) and failure fraction is not met. The denominator for this fraction
> is the total number of tasks. That causes the re-run to never occur. This
> JIRA tracks the AM side of the change to alleviate this problem.
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