[jira] Commented: (HADOOP-3596) Namenode cluster(multi namenode working in active-active mode) to keep high availability and expansivity

["Qi Ji (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-3596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12611916#action_12611916 ] 

Qi Ji commented on HADOOP-3596:
-------------------------------

Yeah, when the file number approximates 100 million the overall performance is greatly affected by name node performance. We are going  to work this out by a patch about cooperative multi namenodes soon.

> Namenode cluster(multi namenode working in active-active mode) to keep high availability and expansivity
> --------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-3596
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3596
>             Project: Hadoop Core
>          Issue Type: New Feature
>          Components: dfs
>         Environment: Hadoop cluster on more than thousands of nodes, most of all, the number of files is mass.
>            Reporter: Meng Xu
>   Original Estimate: 672h
>  Remaining Estimate: 672h
>
>  If we use the DFS to store a great quantity of files which is very small, i.e. the namenode is under high pressure of indexing files, should we consider to introduce other namenodes working concurrently for availability and scalability?

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