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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-5376) Incremental rescanning of cached blocks and cache entries
Date Thu, 07 Nov 2013 21:15:17 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5376?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Colin Patrick McCabe updated HDFS-5376:
---------------------------------------

    Issue Type: Wish  (was: Sub-task)
        Parent:     (was: HDFS-4949)

> Incremental rescanning of cached blocks and cache entries
> ---------------------------------------------------------
>
>                 Key: HDFS-5376
>                 URL: https://issues.apache.org/jira/browse/HDFS-5376
>             Project: Hadoop HDFS
>          Issue Type: Wish
>          Components: namenode
>    Affects Versions: HDFS-4949
>            Reporter: Andrew Wang
>            Assignee: Andrew Wang
>
> {{CacheReplicationMonitor#rescan}} is invoked whenever a new cache entry is added or
removed. This involves a complete rescan of all cache entries and cached blocks, which is
potentially expensive. It'd be better to do an incremental scan instead. This would also let
us incrementally re-scan on namespace changes like rename and create for better caching latency.



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