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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-8088) Reduce the number of HTrace spans generated by HDFS reads
Date Wed, 08 Apr 2015 02:12:12 GMT
Colin Patrick McCabe created HDFS-8088:
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             Summary: Reduce the number of HTrace spans generated by HDFS reads
                 Key: HDFS-8088
                 URL: https://issues.apache.org/jira/browse/HDFS-8088
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Colin Patrick McCabe
            Assignee: Colin Patrick McCabe


HDFS generates too many trace spans on read right now.  Every call to read() we make generates
its own span, which is not very practical for things like HBase or Accumulo that do many such
reads as part of a single operation.  Instead of tracing every call to read(), we should only
trace the cases where we refill the buffer inside a BlockReader.



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