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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8088) Reduce the number of HTrace spans generated by HDFS reads
Date Tue, 14 Apr 2015 19:55:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14494761#comment-14494761
] 

Colin Patrick McCabe commented on HDFS-8088:
--------------------------------------------

also I am at a conference now, so I apologize if my replies are slow!

> 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
>         Attachments: HDFS-8088.001.patch
>
>
> 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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