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From "sam rash (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (HDFS-1214) hdfs client metadata cache
Date Tue, 22 Jun 2010 22:09:52 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1214?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

sam rash reassigned HDFS-1214:
------------------------------

    Assignee: sam rash

> hdfs client metadata cache
> --------------------------
>
>                 Key: HDFS-1214
>                 URL: https://issues.apache.org/jira/browse/HDFS-1214
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: hdfs client
>            Reporter: Joydeep Sen Sarma
>            Assignee: sam rash
>
> In some applications, latency is affected by the cost of making rpc calls to namenode
to fetch metadata. the most obvious case are calls to fetch file/directory status. applications
like hive like to make optimizations based on file size/number etc. - and for such optimizations
- 'recent' status data (as opposed to most up-to-date) is acceptable. in such cases, a cache
on the DFS client that transparently caches metadata would be greatly benefit applications.

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