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Re: Reducers are launched after jobClient is exited. - MapReduce - [mail # dev]
...MapReduce AppMaster and YARN at large use asynchronous event handling inside the JVM and so you may run into race conditions like this.Even otherwise, doing this in a deterministic manner is...
   Author: Vinod Kumar Vavilapalli, 2014-01-29, 06:48
Re: DistributedCache is empty - MapReduce - [mail # user]
...What is the version of Hadoop that you are using?  +Vinod  On Jan 16, 2014, at 2:41 PM, Keith Wiley  wrote:    CONFIDENTIALITY NOTICE NOTICE: This message is intende...
   Author: Vinod Kumar Vavilapalli, 2014-01-17, 17:46
Re: How to make AM terminate if client crashes? - MapReduce - [mail # user]
...The architecture is built around detachable clients. So, no, it doesn't happen automatically. Even if we were to add that feature, it'd be fraught with edge cases - network issues causing ap...
   Author: Vinod Kumar Vavilapalli, 2014-01-13, 16:30
Re: Why none AppMaster node seeks IPCServer on itself. - MapReduce - [mail # user]
...Checked the firewall rules?  +Vinod  On Jan 8, 2014, at 3:22 AM, Saeed Adel Mehraban  wrote:    CONFIDENTIALITY NOTICE NOTICE: This message is intended for the use o...
   Author: Vinod Kumar Vavilapalli, 2014-01-08, 18:28
Re: Ways to manage user accounts on hadoop cluster when using kerberos security - MapReduce - [mail # user]
...On Jan 7, 2014, at 2:55 PM, Manoj Samel  wrote:    That's how I've seen this issue addressed.   +Vinod CONFIDENTIALITY NOTICE NOTICE: This message is intended for the use...
   Author: Vinod Kumar Vavilapalli, 2014-01-08, 18:22
Re: Understanding MapReduce source code : Flush operations - MapReduce - [mail # user]
...What OutputFormat are you using?  Once it reaches OutputFormat (specifically RecordWriter) it all depends on what the RecordWriter does. Are you using some OutputFormat with a RecordWri...
   Author: Vinod Kumar Vavilapalli, 2014-01-07, 05:21
Re: Map succeeds but reduce hangs - MapReduce - [mail # user]
...Check the TaskTracker configuration in mapred-site.xml: mapred.task.tracker.report.address. You may be setting it to or localhost:0. Change it to and restart the daemon...
   Author: Vinod Kumar Vavilapalli, 2014-01-02, 18:28
Re: What are the methods to share dynamic data among mappers/reducers? - MapReduce - [mail # user]
...There isn't anything natively supported for that in the framework, but you can do that yourselves by using a shared service (for e.g via HDFS files, ZooKeeper nodes) that mappers/reducers al...
   Author: Vinod Kumar Vavilapalli, 2014-01-02, 18:21
[expand - 1 more] - Re: Yarn -- one of the daemons getting killed - MapReduce - [mail # user]
...That's good info. It is more than likely that it is the OOM killer. See http://stackoverflow.com/questions/726690/who-killed-my-process-and-why for example.  Thanks, +Vinod  On Dec...
   Author: Vinod Kumar Vavilapalli, 2013-12-17, 19:01
Re: pipes on hadoop 2.2.0 crashes - MapReduce - [mail # user]
...You should navigate to the ResourceManager UI following the link and see what is happening on the ResourceManager as well as the application-master. Check if any nodes are active first. Then...
   Author: Vinod Kumar Vavilapalli, 2013-12-16, 18:32
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