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https://issues.apache.org/jira/browse/HADOOP-1707?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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dhruba borthakur updated HADOOP-1707:
-------------------------------------
Attachment: clientDiskBuffer16.patch
This patch fixes another performance degradation shown by the earlier patch.
There was a race condition whereby an intermediate datanode in the pipeline was
ignoring the response sent from the downstream datanode, always forwarding an
"error" to the client.
> 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
>
> Attachments: clientDiskBuffer.patch, clientDiskBuffer10.patch,
> clientDiskBuffer11.patch, clientDiskBuffer12.patch, clientDiskBuffer14.patch,
> clientDiskBuffer15.patch, clientDiskBuffer16.patch, clientDiskBuffer2.patch,
> clientDiskBuffer6.patch, clientDiskBuffer7.patch, clientDiskBuffer8.patch,
> clientDiskBuffer9.patch, DataTransferProtocol.doc, DataTransferProtocol.html
>
>
> 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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