[jira] [Created] (HIVE-13014) RetryingMetaStoreClient is retrying too aggresievley

["Eugene Koifman (JIRA)" <ji...@apache.org>]

Eugene Koifman created HIVE-13014:
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             Summary: RetryingMetaStoreClient is retrying too aggresievley
                 Key: HIVE-13014
                 URL: https://issues.apache.org/jira/browse/HIVE-13014
             Project: Hive
          Issue Type: Bug
          Components: Metastore, Transactions
    Affects Versions: 1.0.0
            Reporter: Eugene Koifman
            Assignee: Eugene Koifman
            Priority: Critical


Not all metastore operations are idempotent.  For example, commit_txn() consists of 
1. request from client to server
2. server action
3. ack to client

If network connection is broken after (or during) 2 but before 3 happens, RetryingMetastoreClient will retry the operation thus causing an attempt to commit the same txn twice (sometimes in concurrently)

The 2nd attempt is guaranteed to fail and thus return an error to the caller (which doesn't know the operation is being retried), while the first attempt has actually succeeded.  Thus the caller thinks commit failed and will likely attempt to redo the transactions - not what we want in most cases.




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