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From "Chris Li (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-9640) RPC Congestion Control
Date Tue, 03 Dec 2013 22:35:36 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-9640?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Li updated HADOOP-9640:
-----------------------------

    Attachment:     (was: Screen Shot 2013-11-18 at 2.54.19 PM.png)

> RPC Congestion Control
> ----------------------
>
>                 Key: HADOOP-9640
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9640
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 3.0.0, 2.2.0
>            Reporter: Xiaobo Peng
>              Labels: hdfs, qos, rpc
>         Attachments: faircallqueue.patch, rpc-congestion-control-draft-plan.pdf
>
>
> Several production Hadoop cluster incidents occurred where the Namenode was overloaded
and failed to be responsive.  This task is to improve the system to detect RPC congestion
early, and to provide good diagnostic information for alerts that identify suspicious jobs/users
so as to restore services quickly.
> Excerpted from the communication of one incident, “The map task of a user was creating
huge number of small files in the user directory. Due to the heavy load on NN, the JT also
was unable to communicate with NN...The cluster became responsive only once the job was killed.”
> Excerpted from the communication of another incident, “Namenode was overloaded by GetBlockLocation
requests (Correction: should be getFileInfo requests. the job had a bug that called getFileInfo
for a nonexistent file in an endless loop). All other requests to namenode were also affected
by this and hence all jobs slowed down. Cluster almost came to a grinding halt…Eventually
killed jobtracker to kill all jobs that are running.”
> Excerpted from HDFS-945, “We've seen defective applications cause havoc on the NameNode,
for e.g. by doing 100k+ 'listStatus' on very large directories (60k files) etc.”



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