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https://issues.apache.org/jira/browse/HDFS-3689?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jing Zhao updated HDFS-3689:
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Attachment: HDFS-3689.000.patch
Upload a preliminary patch that addresses the above #3 and #4. Specifically a
new append RPC is added which always appends new data to a new block, and thus
the previous last block becomes a block with variable length. Some unit tests
are added to make sure the appended file can still be read/pread by the current
DFSInputStream.
If this is a correct direction towards variable block length support, the
remaining work can be:
# bug fix and code cleanup
# loose the restriction of concat
# add support in DFSOutputStream to let clients specify when to allocate a new
block
> Add support for variable length block
> -------------------------------------
>
> Key: HDFS-3689
> URL: https://issues.apache.org/jira/browse/HDFS-3689
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: datanode, hdfs-client, namenode
> Affects Versions: 3.0.0
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
> Attachments: HDFS-3689.000.patch
>
>
> Currently HDFS supports fixed length blocks. Supporting variable length block
> will allow new use cases and features to be built on top of HDFS.
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