Workflow error logs disabled in Oozie 4.2

Question

I am using Oozie 4.2 that comes bundled with HDP 2.3.

while working with a few example workflow's that comes with the oozie package, I noticed that the "job error log is disabled" and this makes debugging really difficult in the event of a failure. I tried running the below commands,

# oozie job -config /home/santhosh/examples/apps/hive/job.properties -run
job: 0000063-150904123805993-oozie-oozi-W

# oozie job -errorlog 0000063-150904123805993-oozie-oozi-W

Error Log is disabled!!

Can someone please tell me how to enable the workflow error log for oozie?

Answer 1

As mentioned, the errorlog is new and may not be made available for good reasons. However it seems that you have the wrong expectation of the oozie error log.

The error log is meant to be a subset of the log file. Not an addition to it.

So yes, it could make things easier to debug, but if you checked the oozie log and did not find what you are looking for, the error log will not be the solution for you.

Probably you will want to look at the log of the underlying tasks, which can be found via the external ID.

Answer 2

In the Oozie UI, 'Job Error Log' is a tab which was introduced in HDP v2.3 on Oozie v4.2 .
This is the most simplest way of looking for error for the specified oozie job from the oozie log file.

To enable the oozie's Job Error Log, please make the following changes in the oozie log4j property file:

1. Add the below set of lines after log4j.appender.oozie and before log4j.appender.oozieops:

log4j.appender.oozieError=org.apache.log4j.rolling.RollingFileAppender
log4j.appender.oozieError.RollingPolicy=org.apache.oozie.util.OozieRollingPolicy
log4j.appender.oozieError.File=${oozie.log.dir}/oozie-error.log
log4j.appender.oozieError.Append=true
log4j.appender.oozieError.layout=org.apache.log4j.PatternLayout
log4j.appender.oozieError.layout.ConversionPattern=%d{ISO8601} %5p %c{1}:%L - SERVER[${oozie.instance.id}] %m%n
log4j.appender.oozieError.RollingPolicy.FileNamePattern=${log4j.appender.oozieError.File}-%d{yyyy-MM-dd-HH}
log4j.appender.oozieError.RollingPolicy.MaxHistory=720
log4j.appender.oozieError.filter.1 = org.apache.log4j.varia.LevelMatchFilter
log4j.appender.oozieError.filter.1.levelToMatch = WARN
log4j.appender.oozieError.filter.2 = org.apache.log4j.varia.LevelMatchFilter
log4j.appender.oozieError.filter.2.levelToMatch = ERROR
log4j.appender.oozieError.filter.3 =`enter code here` org.apache.log4j.varia.LevelMatchFilter
log4j.appender.oozieError.filter.3.levelToMatch = FATAL
log4j.appender.oozieError.filter.4 = org.apache.log4j.varia.DenyAllFilter 

2. Modify the following from log4j.logger.org.apache.oozie=WARN, oozie to log4j.logger.org.apache.oozie=ALL, oozie, oozieError

3. Restart the oozie service. This would help in getting the job error log for the new jobs launched after restart of oozie service.