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https://issues.apache.org/jira/browse/HADOOP-1158?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Doug Cutting updated HADOOP-1158:
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Status: Open (was: Patch Available)
This generates a new compiler warning for me:
{noformat}
[javac]
/home/cutting/src/hadoop/trunk/src/java/org/apache/hadoop/mapred/ReduceTaskStatus.java:48:
warning: [unchecked] unchecked cast
[javac] found : java.lang.Object
[javac] required: java.util.List<java.lang.String>
[javac] (List<String>)(((ArrayList<String>)failedFetchTasks).clone());
[javac] ^
{noformat}
> JobTracker should collect statistics of failed map output fetches, and take
> decisions to reexecute map tasks and/or restart the (possibly faulty) Jetty
> server on the TaskTracker
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-1158
> URL: https://issues.apache.org/jira/browse/HADOOP-1158
> Project: Hadoop
> Issue Type: Improvement
> Components: mapred
> Affects Versions: 0.12.2
> Reporter: Devaraj Das
> Assignee: Arun C Murthy
> Fix For: 0.15.0
>
> Attachments: HADOOP-1158_20070702_1.patch,
> HADOOP-1158_2_20070808.patch, HADOOP-1158_3_20070809.patch
>
>
> The JobTracker should keep a track (with feedback from Reducers) of how many
> times a fetch for a particular map output failed. If this exceeds a certain
> threshold, then that map should be declared as lost, and should be reexecuted
> elsewhere. Based on the number of such complaints from Reducers, the
> JobTracker can blacklist the TaskTracker. This will make the framework
> reliable - it will take care of (faulty) TaskTrackers that sometimes always
> fail to serve up map outputs (for which exceptions are not properly
> raised/handled, for e.g., if the exception/problem happens in the Jetty
> server).
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