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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-9807) Add an optional StorageID to writes
Date Thu, 04 May 2017 04:24:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-9807?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15996161#comment-15996161
] 

Chris Douglas commented on HDFS-9807:
-------------------------------------

bq. Makes sense. May be others can comment if this needs to be changed?
Either way; not worth spending time pondering. Generally history is easier to read (git blame)
when it's not overlaid with unrelated cosmetic changes, but that rule doesn't apply meaningfully,
here.

+1 overall. The changes to {{Host2NodesMap}} and {{BlockPlacementPolicyDefault}} are unrelated?

I'll commit this tomorrow if there are no further comments.

> 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,
HDFS-9807.005.patch, HDFS-9807.006.patch, HDFS-9807.007.patch, HDFS-9807.008.patch, HDFS-9807.009.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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