Uma Maheswara Rao G created HDFS-8189:
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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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