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https://issues.apache.org/jira/browse/HDFS-8088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14486605#comment-14486605
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Yi Liu edited comment on HDFS-8088 at 4/9/15 2:53 AM:
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Colin, thanks for working on this, I have not gone through HDFS-8069, does it
really degrade the performance of DFSInputStream a lot? If so, I think this is
a block issue and let's make it in ASAP.
was (Author: hitliuyi):
Colin, seems today is the deadline of 2.7 release? I have not gone through
HDFS-8069, does it really degrade the performance of DFSInputStream a lot? If
so, I think this is a block issue and we should make this in today.
let me look at the patch now.
> 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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