Steve Loughran created SPARK-16736:
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Summary: remove redundant FileSystem.exists() calls from Spark
codebase
Key: SPARK-16736
URL: https://issues.apache.org/jira/browse/SPARK-16736
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 2.0.0
Reporter: Steve Loughran
Priority: Minor
The Hadoop {{FileSystem.exists()}} and {{FileSystem.isDirectory()}} calls are
wrappers around FileSystem.getStatus(), —the latter putting load on an HDFS NN,
and very, very slow against object stores.
# if these calls are followed by any getStatus() calls then they can be
eliminated by careful merging and pulling out the catching of
{FileNotFoundException}} from the exists() call to the spark code.
# Any sequence of exists + delete can be optimised by removing the exists
check, relying on {{FileSystem.delete()}} to be a no-op if the destination path
is not present. That's a tested requirement of all Hadoop compatible FS and
object stores.
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