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https://issues.apache.org/jira/browse/HDFS-11211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15724676#comment-15724676
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Akira Ajisaka commented on HDFS-11211:
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"duration(ns): %s" seems fine.
> Add a time unit to the DataNode client trace format
> ----------------------------------------------------
>
> Key: HDFS-11211
> URL: https://issues.apache.org/jira/browse/HDFS-11211
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: datanode
> Reporter: Akira Ajisaka
> Priority: Minor
> Labels: newbie, supportability
>
> {code:title=DataNode.java}
> public static final String DN_CLIENTTRACE_FORMAT =
> "src: %s" + // src IP
> ", dest: %s" + // dst IP
> ", bytes: %s" + // byte count
> ", op: %s" + // operation
> ", cliID: %s" + // DFSClient id
> ", offset: %s" + // offset
> ", srvID: %s" + // DatanodeRegistration
> ", blockid: %s" + // block id
> ", duration: %s"; // duration time
> {code}
> The time unit of the duration is nanosecond, but it is not documented.
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