Yonik Seeley created SOLR-3715:
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             Summary: improve tlog concurrency
                 Key: SOLR-3715
                 URL: https://issues.apache.org/jira/browse/SOLR-3715
             Project: Solr
          Issue Type: Improvement
            Reporter: Yonik Seeley


Right now log record serialization is synchronized.  We can improve concurrency 
by serializing to a ram buffer outside synchronization.  The cost will be RAM 
usage for buffering, and more complex concurrency in the tlog itself (i.e. we 
must ensure that a close does not happen without flushing all in-RAM buffers)

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