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From "Ajay Kumar (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-12545) Autotune NameNode RPC handler threads according to number of datanodes in cluster
Date Tue, 26 Sep 2017 18:36:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-12545?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ajay Kumar updated HDFS-12545:
------------------------------
    Description: 
Autotune NameNode RPC handler threads according to number of datanodes in cluster. 
Currently rpc handler are controlled by {{dfs.namenode.handler.count}} on cluster start. Jira
is to discuss best way to auto tune it according to no of datanodes and any other relevant
input. Updating this to {{max(dfs.namenode.handler.count, min(200,20 * log2(number of DataNodes)))}}
on NameNode start is one possible way. (This heuristic is from  [Hadoop Operations|http://shop.oreilly.com/product/0636920025085.do]
book.)

  was:Autotune NameNode RPC handler threads according to number of datanodes in cluster. Currently
rpc handler are controlled by {{dfs.namenode.handler.count}} on cluster start. Jira is to
discuss best way to auto tune it according to no of datanodes. Updating this to {{max(dfs.namenode.handler.count,
min(200,20 * log2(no of datanodes)))}} on NameNode start is one possible way. 


> Autotune NameNode RPC handler threads according to number of datanodes in cluster
> ---------------------------------------------------------------------------------
>
>                 Key: HDFS-12545
>                 URL: https://issues.apache.org/jira/browse/HDFS-12545
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Ajay Kumar
>            Assignee: Ajay Kumar
>
> Autotune NameNode RPC handler threads according to number of datanodes in cluster. 
> Currently rpc handler are controlled by {{dfs.namenode.handler.count}} on cluster start.
Jira is to discuss best way to auto tune it according to no of datanodes and any other relevant
input. Updating this to {{max(dfs.namenode.handler.count, min(200,20 * log2(number of DataNodes)))}}
on NameNode start is one possible way. (This heuristic is from  [Hadoop Operations|http://shop.oreilly.com/product/0636920025085.do]
book.)



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