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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-3588) Proposal to optimize ReadWriteConsistencyControl
Date Wed, 02 Mar 2011 07:47:38 GMT
Proposal to optimize ReadWriteConsistencyControl

                 Key: HBASE-3588
                 URL: https://issues.apache.org/jira/browse/HBASE-3588
             Project: HBase
          Issue Type: Improvement
          Components: regionserver
            Reporter: dhruba borthakur
            Assignee: dhruba borthakur

The ReadWriteConsistencyControl (RWCC) mechanism facilitates making a set of memstore updates
atomically visible to readers. Also, the rwcc.completeMemstoreInsert() blocks till the memstore
read point advances to the current writeNumber. This is done to ensure that if an application
that does a put immediately issues a new get call for the same key, then the get should see
the values inserted by the previous call to put. The current implementation assumes this worst-case
and penalizes the put rpc to not return to the client until the read point advances to this
transaction's write number.

In many use-cases, the application never actually issues a get for the most recent put that
it inserted. In this case, it would be nice if we can transfer the penalty (of blocking) to
the get call that follows the initial put.

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