Yuxuan Wang created HDFS-14761:
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Summary: RBF: MountTableResolver cannot invalidate cache correctly
Key: HDFS-14761
URL: https://issues.apache.org/jira/browse/HDFS-14761
Project: Hadoop HDFS
Issue Type: Bug
Components: rbf
Reporter: Yuxuan Wang
STEPS TO REPRODUCE:
add mount table entry 1->/
mountTable.getDestinationForPath("/foo/a") will return "1->/foo/a", that's
correct
add mount table entry 2->/foo
mountTable.getDestinationForPath("/foo/a") should return "2->/foo/a", but it
still return "1->/foo/a"
WHY:
{code:title=MountTableResolver.java|borderStyle=solid}
private void invalidateLocationCache(...)
{
...
String src = loc.getSourcePath();
if (src != null) {
if (isParentEntry(src, path)) {
LOG.debug("Removing {}", src);
it.remove();
}
}
...
}
{code}
*path* is the new entry, in our case is "/foo"
But src is the mount point path, in our case is "/", which isn't child of "/foo"
So, it can't invalidate the cache entry.
HOW TO FIX:
Just reverse the parameters of *isParentEntry* .
PS:
*PathLocation#getSourcePath()* will return *PathLocation#sourcePath*, which
attached a comment about "Source path in global namespace.". But I think the
field indeed denotes the mount point path after I review the code. I think it's
confused.
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