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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-5651) remove dfs.namenode.caching.enabled
Date Mon, 16 Dec 2013 01:51:07 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5651?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Colin Patrick McCabe updated HDFS-5651:
---------------------------------------

    Attachment: HDFS-5651.003.patch

remove test of dfs.namenode.caching.enabled (it's not needed, since this config doesn't exist
any more)

> remove dfs.namenode.caching.enabled
> -----------------------------------
>
>                 Key: HDFS-5651
>                 URL: https://issues.apache.org/jira/browse/HDFS-5651
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>    Affects Versions: 3.0.0
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>         Attachments: HDFS-5651.001.patch, HDFS-5651.002.patch, HDFS-5651.003.patch
>
>
> We can remove dfs.namenode.caching.enabled and simply always enable caching, similar
to how we do with snapshots and other features.  The main overhead is the size of the cachedBlocks
GSet.  However, we can simply make the size of this GSet configurable, and people who don't
want caching can set it to a very small value.



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