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Konstantin Shvachko commented on HDFS-4849: ------------------------------------------- That is right, Steve. You want something more from the operations than just being idempotent. Your definition is equivalent to: {color:green}_create(path, NS1) = create(path, NS2) for any NS1 and NS2_{color} I don't think this is what traditionally called _idempotent_. I am also not sure it is necessary to impose such requirement on file system operations. Some references would be good to have. > Idempotent create and append operations. > ---------------------------------------- > > Key: HDFS-4849 > URL: https://issues.apache.org/jira/browse/HDFS-4849 > Project: Hadoop HDFS > Issue Type: Improvement > Components: namenode > Affects Versions: 2.0.4-alpha > Reporter: Konstantin Shvachko > Assignee: Konstantin Shvachko > Priority: Blocker > Attachments: idempotentCreate.patch, idempotentCreate.patch, > idempotentCreate.patch > > > create, append and delete operations can be made idempotent. This will reduce > chances for a job or other app failures when NN fails over. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira