Adam Antal created YARN-9808:
--------------------------------
Summary: 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
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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