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Date: Fri, 6 Jan 2017 21:49:58 +0000 (UTC)
From: "Junping Du (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12819158.1428459096000.670869.1483739398935@Atlassian.JIRA>
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References: <JIRA.12819158.1428459096000@Atlassian.JIRA> <JIRA.12819158.1428459096595@arcas>
Subject: [jira] [Updated] (HDFS-8088) Reduce the number of HTrace spans
 generated by HDFS reads
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archived-at: Fri, 06 Jan 2017 21:50:01 -0000


     [ https://issues.apache.org/jira/browse/HDFS-8088?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Junping Du updated HDFS-8088:
-----------------------------
    Target Version/s:   (was: 2.8.0)

> 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 P. McCabe
>            Assignee: Colin P. 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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