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From "Uma Maheswara Rao G (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-8189) ClientProtocol#createErasureCodingZone API was wrongly annotated as Idempotent
Date Mon, 20 Apr 2015 19:09:59 GMT
Uma Maheswara Rao G created HDFS-8189:
-----------------------------------------

             Summary: 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: Uma Maheswara Rao G


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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