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Date: Fri, 12 Oct 2007 14:42:50 -0700 (PDT)
From: "dhruba borthakur (JIRA)" <jira@apache.org>
To: hadoop-dev@lucene.apache.org
Subject: [jira] Updated: (HADOOP-1707) Remove the DFS Client disk-based
 cache
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     [ https://issues.apache.org/jira/browse/HADOOP-1707?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

dhruba borthakur updated HADOOP-1707:
-------------------------------------

    Fix Version/s: 0.16.0
          Summary: Remove the DFS Client disk-based cache  (was: DFS client can allow user to write data to the next block while uploading previous block to HDFS)

> Remove the DFS Client disk-based cache
> --------------------------------------
>
>                 Key: HADOOP-1707
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1707
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>             Fix For: 0.16.0
>
>
> The DFS client currently uses a staging file on local disk to cache all user-writes to a file. When the staging file accumulates 1 block worth of data, its contents are flushed to a HDFS datanode. These operations occur sequentially.
> A simple optimization of allowing the user to write to another staging file while simultaneously uploading the contents of the first staging file to HDFS will improve file-upload performance.

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