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https://issues.apache.org/jira/browse/YARN-9808?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adam Antal updated YARN-9808:
-----------------------------
    Attachment: YARN-9808.003.patch

> Zero length files in container log output haven't got a header
> --------------------------------------------------------------
>
>                 Key: YARN-9808
>                 URL: https://issues.apache.org/jira/browse/YARN-9808
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: log-aggregation, yarn
>    Affects Versions: 3.2.0
>            Reporter: Adam Antal
>            Assignee: Adam Antal
>            Priority: Major
>         Attachments: YARN-9808.001.patch, YARN-9808.002.patch, 
> YARN-9808.003.patch
>
>
> Using the Yarn logs CLI for containers that have zero length files produces 
> output similar to this:
> {noformat}
> End of LogType:stderr
> ***********************************************************************
> End of LogType:prelaunch.err
> ******************************************************************************
> Container: container_e25_1567431105510_0001_01_000002 on host-1
> LogAggregationType: AGGREGATED
> =======================================================================================================
> LogType:container.log
> LogLastModifiedTime:Mon Sep 02 06:34:48 -0700 2019
> LogLength:5442
> LogContents:
> ...
> ...
> {noformat}
> Note that stderr and prelaunch.err are both zero length files. Though the 
> output is not misleading, the header is missing.
> I suggest to add the header for zero length files as well, primarily for the 
> following reasons:
> - for applications having multiple files with the same name you may want to 
> distinguish them by host - if many of those are of zero length, you can not 
> extract this information from here. Note that this is a common case for 
> stderr and prelaunch.err.
> - you may want to see the modification time (which corresponds to the 
> creation time of the zero length file)
> - would explicitly display the "LogLength:0" line, which would avoid any 
> confusion from end user side.



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