Marcelo Vanzin created SPARK-3788:
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Summary: Yarn dist cache code is not friendly to HDFS HA,
Federation
Key: SPARK-3788
URL: https://issues.apache.org/jira/browse/SPARK-3788
Project: Spark
Issue Type: Bug
Components: YARN
Reporter: Marcelo Vanzin
There are two bugs here.
1. The {{compareFs()}} method in ClientBase considers the 'host' part of the
URI to be an actual host. In the case of HA and Federation, that's a namespace
name, which doesn't resolve to anything. So in those cases, {{compareFs()}}
always says the file systems are different.
2. In {{prepareLocalResources()}}, when adding a file to the distributed cache,
that is done with the common FileSystem object instantiated at the start of the
method. In the case of Federation that doesn't work: the qualified URL's scheme
may differ from the non-qualified one, so the FileSystem instance will not work.
Fixes are pretty trivial.
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