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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (HDFS-4184) Add the ability for Client to provide more hint information for DataNode to manage the OS buffer cache more accurate
Date Tue, 13 Nov 2012 03:55:13 GMT

     [ https://issues.apache.org/jira/browse/HDFS-4184?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack reopened HDFS-4184:
-------------------------


Here, I reopened it for you (in case you can't)
                
> Add the ability for Client to provide more hint information for DataNode to manage the
OS buffer cache more accurate
> --------------------------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-4184
>                 URL: https://issues.apache.org/jira/browse/HDFS-4184
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: binlijin
>
> HDFS now has the ability to use posix_fadvise and sync_data_range syscalls to manage
the OS buffer cache.
> {code}
> When hbase read hlog the data we can set dfs.datanode.drop.cache.behind.reads to true
to drop data out of the buffer cache when performing sequential reads.
> When hbase write hlog we can set dfs.datanode.drop.cache.behind.writes to true to drop
data out of the buffer cache after writing
> When hbase read hfile during compaction we can set dfs.datanode.readahead.bytes to a
non-zero value to trigger readahead for sequential reads.
> and so on... 
> {code}

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