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https://issues.apache.org/jira/browse/HDFS-6584?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14150629#comment-14150629
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Hudson commented on HDFS-6584:
------------------------------
FAILURE: Integrated in Hadoop-Mapreduce-trunk #1909 (See
[https://builds.apache.org/job/Hadoop-Mapreduce-trunk/1909/])
CHANGES.txt: move HDFS-6584 and its subtasks to Release 2.6.0. (szetszwo: rev
a6049aa994dbddc3f640d2121e3aabb3a363943d)
* hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
> Support Archival Storage
> ------------------------
>
> Key: HDFS-6584
> URL: https://issues.apache.org/jira/browse/HDFS-6584
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: balancer, namenode
> Reporter: Tsz Wo Nicholas Sze
> Assignee: Tsz Wo Nicholas Sze
> Fix For: 2.6.0
>
> Attachments: HDFS-6584.000.patch,
> HDFSArchivalStorageDesign20140623.pdf, HDFSArchivalStorageDesign20140715.pdf,
> archival-storage-testplan.pdf, h6584_20140907.patch, h6584_20140908.patch,
> h6584_20140908b.patch, h6584_20140911.patch, h6584_20140911b.patch,
> h6584_20140915.patch, h6584_20140916.patch, h6584_20140916.patch,
> h6584_20140917.patch, h6584_20140917b.patch, h6584_20140918.patch,
> h6584_20140918b.patch
>
>
> In most of the Hadoop clusters, as more and more data is stored for longer
> time, the demand for storage is outstripping the compute. Hadoop needs a cost
> effective and easy to manage solution to meet this demand for storage.
> Current solution is:
> - Delete the old unused data. This comes at operational cost of identifying
> unnecessary data and deleting them manually.
> - Add more nodes to the clusters. This adds along with storage capacity
> unnecessary compute capacity to the cluster.
> Hadoop needs a solution to decouple growing storage capacity from compute
> capacity. Nodes with higher density and less expensive storage with low
> compute power are becoming available and can be used as cold storage in the
> clusters. Based on policy the data from hot storage can be moved to cold
> storage. Adding more nodes to the cold storage can grow the storage
> independent of the compute capacity in the cluster.
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