Steve Loughran created HADOOP-15094:
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Summary: FileSystem
Key: HADOOP-15094
URL: https://issues.apache.org/jira/browse/HADOOP-15094
Project: Hadoop Common
Issue Type: Improvement
Reporter: Steve Loughran
Discussion around SPARK-22587 highlights how per-fs notions of a canonical URI
make it hard to determine if a file is on a specific filesystem, or, put
differently, if two filesystems are equivalent.
You can't reliably use this.getUri == that.getUri as it doesn't handle FQDN ==
unqualified DN, bit you can't do nslookup as HDFS HA doesn't use hosnames.
If {{FileSystem.getCanonicalUri()}} were public, then this could be used to
compare things consistently.
needs: filesystem.md coverage; contract test (two filesystem instances are
equal, different filesystems aren't). Or at least: this method never returns
null.
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