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From "luhuichun (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-11975) Provide a system-default EC policy
Date Thu, 06 Jul 2017 05:09:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-11975?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

luhuichun updated HDFS-11975:
    Attachment: HDFS-11975-006.patch

we find we can set optional ecPolicyName in erasurecoding.proto and  remove "Null check" in
ClientNamenodeProtocolTranslatorPB and ClientNamenodeProtocolServerSideTranslatorPB, this
can be avoid of passing the const string which is a not better solution.

> Provide a system-default EC policy
> ----------------------------------
>                 Key: HDFS-11975
>                 URL: https://issues.apache.org/jira/browse/HDFS-11975
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: erasure-coding
>    Affects Versions: 3.0.0-alpha3
>            Reporter: Lei (Eddy) Xu
>            Assignee: luhuichun
>         Attachments: HDFS-11975-001.patch, HDFS-11975-002.patch, HDFS-11975-003.patch,
HDFS-11975-004.patch, HDFS-11975-005.patch, HDFS-11975-006.patch
> From the usability point of view, it'd be nice to be able to specify a system-wide EC
policy, i.e., in {{hdfs-site.xml}}. For most of users / admin / downstream projects, it is
not necessary to know the tradeoffs of the EC policy, considering that it requires the knowledge
of EC, the actual physical topology of the clusters, and many other factors (i.e., network,
cluster size and etc).

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