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Date: Thu, 23 Mar 2017 12:33:41 +0000 (UTC)
From: "Ewan Higgs (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12938986.1455327519000.100571.1490272421625@Atlassian.JIRA>
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Subject: [jira] [Updated] (HDFS-9807) Add an optional StorageID to writes
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archived-at: Thu, 23 Mar 2017 12:33:48 -0000


     [ 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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