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https://issues.apache.org/jira/browse/TEZ-2442?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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László Bodor reassigned TEZ-2442:
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Assignee: László Bodor (was: shanyu zhao)
> Support DFS based shuffle in addition to HTTP shuffle
> -----------------------------------------------------
>
> Key: TEZ-2442
> URL: https://issues.apache.org/jira/browse/TEZ-2442
> Project: Apache Tez
> Issue Type: Improvement
> Affects Versions: 0.5.3
> Reporter: Kannan Rajah
> Assignee: László Bodor
> Priority: Major
> Attachments: FS_based_shuffle_v2.pdf, TEZ-2442.06.patch, Tez Shuffle
> using DFS.pdf, hdfs_broadcast_hack.txt, tez-2442-trunk.2.patch,
> tez-2442-trunk.3.patch, tez-2442-trunk.4.patch, tez-2442-trunk.5.patch,
> tez-2442-trunk.patch, tez_hdfs_shuffle.patch
>
>
> In Tez, Shuffle is a mechanism by which intermediate data can be shared
> between stages. Shuffle data is written to local disk and fetched from any
> remote node using HTTP. A DFS like MapR file system can support writing this
> shuffle data directly to its DFS using a notion of local volumes and retrieve
> it using HDFS API from remote node. The current Shuffle implementation
> assumes local data can only be managed by LocalFileSystem. So it uses
> RawLocalFileSystem and LocalDirAllocator. If we can remove this assumption
> and introduce an abstraction to manage local disks, then we can reuse most of
> the shuffle logic (store, sort) and inject a HDFS API based retrieval instead
> of HTTP.
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