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Posted to hdfs-issues@hadoop.apache.org by "Colin Patrick McCabe (JIRA)" <ji...@apache.org> on 2015/04/08 04:12:12 UTC

[jira] [Created] (HDFS-8088) Reduce the number of HTrace spans generated by HDFS reads

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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