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https://issues.apache.org/jira/browse/HDFS-7055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14157730#comment-14157730
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Masatake Iwasaki commented on HDFS-7055:
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bq. I think we can reduce this by not creating trace spans for every read done
via a BlockReader-- only the reads which actually result in data being written
from the DN.
I agree but still see 280 spans on .005 patch.
> Add tracing to DFSInputStream
> -----------------------------
>
> Key: HDFS-7055
> URL: https://issues.apache.org/jira/browse/HDFS-7055
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: datanode, namenode
> Affects Versions: 2.6.0
> Reporter: Colin Patrick McCabe
> Assignee: Colin Patrick McCabe
> Attachments: HDFS-7055.002.patch, HDFS-7055.003.patch,
> HDFS-7055.004.patch, HDFS-7055.005.patch, screenshot-get-1mb.005.png,
> screenshot-get-1mb.png
>
>
> Add tracing to DFSInputStream.
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