Xuzhou Yin created PIG-5360:
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Summary: Pig sets working directory of input file systems causes
exception thrown
Key: PIG-5360
URL: https://issues.apache.org/jira/browse/PIG-5360
Project: Pig
Issue Type: Bug
Components: impl
Affects Versions: 0.17.0
Reporter: Xuzhou Yin
Fix For: 0.18.0
{color:#000000}In getSplits() method in PigInputFormat, Pig is trying to set
the working directory of input File System to jobContext.getWorkingDirectory(),
which is always the default working directory of default file system (eg.
hdfs://host:port/user/userId in case of HDFS) unless
“mapreduce.job.working.dir” is explicitly set to non-default value. So if the
input path uses non-default file system (eg. EmrFS), then it will fail since it
is trying to set the working directory of EmrFS to a HDFS path.{color}
{color:#000000}The proposed change it to completely remove this logic of
setting working directory. There are several reasons for doing so. {color}
{color:#000000}Firstly, getSplits() is only supposed to return a list of input
splits. It should not have side effects (especially doing so can potentially
change the output path).{color}
{color:#000000}Secondly, there is inconsistency between the working directories
of input and output file systems. if "mapreduce.job.working.dir" is set to
non-default value, it will affect the output path only (if it is a relative
path) because input path will be made qualified even before this logic.{color}
{color:#000000}Thirdly, there is already a "CD" functionality that allows
customers to change the working directory. However, this logic will overwrite
the "CD" functionality if input and output paths both use default file
system.{color}
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