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https://issues.apache.org/jira/browse/HADOOP-1707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12540311
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Raghu Angadi commented on HADOOP-1707:
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> 2. Each datanode sends a heartbeat message to the upstream datanode once
> every half-timeout-period.
It might be better to call this 'KeepAlive' since it is per connection and
avoids confusion with DataNode heartbeat.
> 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, clientDiskBuffer2.patch
>
>
> 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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