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Posted to hdfs-issues@hadoop.apache.org by "Wei-Chiu Chuang (JIRA)" <ji...@apache.org> on 2018/08/02 17:31:24 UTC
[jira] [Commented] (HDFS-13785) EC: "removePolicy" is not working
for built-in/system Erasure Code policies
[ https://issues.apache.org/jira/browse/HDFS-13785?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16567132#comment-16567132 ]
Wei-Chiu Chuang commented on HDFS-13785:
----------------------------------------
I don't quite recall the design here (although I believe I reviewed the patch) but IIRC we decided to not allow system built-in EC policies to be removed.
We should probably expand the EC doc and command line message to include this.
[~Sammi] [~xiaochen]
> EC: "removePolicy" is not working for built-in/system Erasure Code policies
> ---------------------------------------------------------------------------
>
> Key: HDFS-13785
> URL: https://issues.apache.org/jira/browse/HDFS-13785
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: erasure-coding
> Affects Versions: 3.0.0
> Environment: 3 Node SUSE Linux Cluster
> Reporter: Souryakanta Dwivedy
> Priority: Minor
>
> EC: "removePolicy" is not working for built-in/system Erasure Code policies
> - Check the existing built-in EC policies with command "hdfs ec -listPolicies"
> - try to remove any of the EC policies,it will throw error message as "RemoteException: System erasure coding policy RS-3-2-1024k cannot be removed"
> - add user-defined EC policies
> - Try to remove any user-defined policy,it will be removed successfully
> - But in help option it is specified as :
> vm1:/opt/client/install/hadoop/namenode/bin> ./hdfs ec -help removePolicy
> [-removePolicy -policy <policy>]
> Remove an erasure coding policy.
> <policy> The name of the erasure coding policy
> vm1:/opt/client/install/hadoop/namenode/bin>
> Actual result :-
> hdfs ec -removePolicy not working for built-in/system EC policies ,where as usage description
> provided as "Remove an erasure coding policy".throwing exception as : "RemoteException: System erasure coding policy RS-3-2-1024k cannot be removed"
> Expected output : Either EC "removePolicy" option should be applicable for all type of EC policies
> Or it has to be specified in usage that EC "removePolicy" will be applicable to remove
> only user-defined EC policies, not applicable for system EC coding policies.
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