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From "SammiChen (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-12414) Ensure to use CLI command to enable/disable erasure coding policy
Date Tue, 12 Sep 2017 11:24:02 GMT

     [ https://issues.apache.org/jira/browse/HDFS-12414?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

SammiChen updated HDFS-12414:
-----------------------------
    Attachment: HDFS-12414.003.patch

Refine the HDFSErasureCoding.md to try to fix the mvnsite issue

> Ensure to use CLI command to enable/disable erasure coding policy
> -----------------------------------------------------------------
>
>                 Key: HDFS-12414
>                 URL: https://issues.apache.org/jira/browse/HDFS-12414
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: SammiChen
>            Assignee: SammiChen
>              Labels: hdfs-ec-3.0-nice-to-have
>         Attachments: HDFS-12414.001.patch, HDFS-12414.002.patch, HDFS-12414.003.patch
>
>
> Currently, there are two methods for user to enable/disable a erasure coding policy.
One is through "dfs.namenode.ec.policies.enabled" property which is a static way to configure
the enabled erasure coding policies. Another is through "enableErasureCodingPolicy" or "disabledErasureCodingPolicy"
API which can enabled or disable erasure coding policy at runtime. 
> When Namenode restart, there is potential state conflicts between the policy defined
in "dfs.namenode.ec.policies.enabled" and policy saved in fsImage. To resolve the conflict
and simplify the operation, it's better to use just one way and remove the old method configuring
the property.



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