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https://issues.apache.org/jira/browse/HDFS-14679?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16896666#comment-16896666
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Yuan Zhou commented on HDFS-14679:
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Hi [~ayushtkn] just updated the fix with a small change on the template(upper
case -> lower case).
Thanks, -yuan
> failed to add erasure code policies with example template
> ---------------------------------------------------------
>
> Key: HDFS-14679
> URL: https://issues.apache.org/jira/browse/HDFS-14679
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ec
> Affects Versions: 3.1.2
> Reporter: Yuan Zhou
> Assignee: Yuan Zhou
> Priority: Minor
> Attachments: HDFS-14679-01.patch, HDFS-14679-02.patch,
> fix_adding_EC_policy_example.diff
>
>
> Hi Hadoop developers,
>
> Trying to do some quick tests with erasure coding feature and ran into a
> issue on adding policies. The example on adding erasure code policies with
> provided template failed:
> {quote}./bin/hdfs ec -addPolicies -policyFile
> /tmp/user_ec_policies.xml.template
> 2019-07-30 10:35:16,447 INFO util.ECPolicyLoader: Loading EC policy file
> /tmp/user_ec_policies.xml.template
> Add ErasureCodingPolicy XOR-2-1-128k succeed.
> Add ErasureCodingPolicy RS-LEGACY-12-4-256k failed and error message is
> Codec name RS-legacy is not supported
> {quote}
> The issue seems due to be the mismatching codec(upper case vs lower case).
> The codec is in upper case in the example template[1] while all available
> codecs are lower case[2]. A way to fix maybe just converting the codec to
> lower case when parsing the policy schema. Also attached a simple patch here.
> [1]
> [https://github.com/apache/hadoop/blob/trunk/hadoop-hdfs-project/hadoop-hdfs/src/main/conf/user_ec_policies.xml.template#L51]
> [2][https://github.com/apache/hadoop/blob/trunk/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/ErasureCodeConstants.java#L28-L33]
> Thanks, -yuan
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