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From "Ewan Higgs (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-9807) Add an optional StorageID to writes
Date Thu, 23 Mar 2017 12:33:41 GMT

     [ https://issues.apache.org/jira/browse/HDFS-9807?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ewan Higgs updated HDFS-9807:
-----------------------------
    Attachment: HDFS-9807.004.patch

Attaching an updated patch. This fixes the findbugs issue as well as some check style issues.

Some check style issues are left untouched since they are consistent with the surrounding
code or require considerable refactoring (parameter numbers, method length).

> Add an optional StorageID to writes
> -----------------------------------
>
>                 Key: HDFS-9807
>                 URL: https://issues.apache.org/jira/browse/HDFS-9807
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: 3.0.0-alpha2
>            Reporter: Chris Douglas
>            Assignee: Ewan Higgs
>         Attachments: HDFS-9807.001.patch, HDFS-9807.002.patch, HDFS-9807.003.patch, HDFS-9807.004.patch
>
>
> The {{BlockPlacementPolicy}} considers specific storages, but when the replica is written
the DN {{VolumeChoosingPolicy}} is unaware of any preference or constraints from other policies
affecting placement. This limits heterogeneity to the declared storage types, which are treated
as fungible within the target DN. It should be possible to influence or constrain the DN policy
to select a particular storage.



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