Paul Han created YARN-1130:
------------------------------
Summary: Improve the log flushing for tasks when
mapred.userlog.limit.kb is set
Key: YARN-1130
URL: https://issues.apache.org/jira/browse/YARN-1130
Project: Hadoop YARN
Issue Type: Bug
Components: nodemanager
Affects Versions: 2.0.5-alpha
Reporter: Paul Han
When userlog limit is set with something like this:
{code}
<property>
<name>mapred.userlog.limit.kb</name>
<value>2048</value>
<description>The maximum size of user-logs of each task in KB. 0 disables the
cap.
</description>
</property>
{code}
the log entry will be truncated randomly for the jobs.
The log size is left between 1.2MB to 1.6MB.
Since the log is already limited, avoid the log truncation is crucial for user.
The other issue with the current
impl(org.apache.hadoop.yarn.ContainerLogAppender) will not write to log until
the container shutdown and logmanager close all appenders. If user likes to see
the log during task execution, it doesn't support it.
Will propose a patch to add a flush mechanism and also flush the log when task
is done.
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