[jira] [Assigned] (HDFS-4990) Block placement for storage types

["Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-4990?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz Wo (Nicholas), SZE reassigned HDFS-4990:
--------------------------------------------

    Assignee: Tsz Wo (Nicholas), SZE
    
> Block placement for storage types
> ---------------------------------
>
>                 Key: HDFS-4990
>                 URL: https://issues.apache.org/jira/browse/HDFS-4990
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: Suresh Srinivas
>            Assignee: Tsz Wo (Nicholas), SZE
>
> Currently block location for writes are made based on:
> # Datanode load (number of transceivers)
> # Space left on datanode
> # Topology
> With storage abstraction, namenode must choose a storage instead of a datanode for block placement. It also needs to consider storage type, load on the storage etc.
> As an additional benefit, currently HDFS support heterogeneous nodes (nodes with different number of spindles etc.) poorly. This work should help solve that issue as well.

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