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https://issues.apache.org/jira/browse/HDFS-8189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14516517#comment-14516517
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Uma Maheswara Rao G commented on HDFS-8189:
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+1
> ClientProtocol#createErasureCodingZone API was wrongly annotated as Idempotent
> ------------------------------------------------------------------------------
>
> Key: HDFS-8189
> URL: https://issues.apache.org/jira/browse/HDFS-8189
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Reporter: Uma Maheswara Rao G
> Assignee: Vinayakumar B
> Attachments: HDFS-8189-01.patch
>
>
> Currently createErasureCodingZone was annotated as Idempotent
> But it should be annotated as @AtMostOnce as we handle retries via retryCache.
> {code}
> @Idempotent
> public void createErasureCodingZone(String src, ECSchema schema)
> throws IOException;
> {code}
> It will fail to create Zone if its already a zone. So, simply we can not
> retry by ignoring previous call success. So, we were using retryCache already
> for handling this situation.
> {code}
> if (getECSchema(srcIIP) != null) {
> throw new IOException("Directory " + src + " is already in an " +
> "erasure coding zone.");
> }
> {code}
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