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https://issues.apache.org/jira/browse/HADOOP-8422?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13281632#comment-13281632
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Daryn Sharp commented on HADOOP-8422:
-------------------------------------
Just FYI, I made the original patch for these apis, John George added tests and
took it over the finish line. Either of us can address the issues posed in
this jira.
bq. I do not quite know what ViewFileSystem does at the moment, but for
non-Path queries is there no View-Root-Path it can fall back on?
Last I knew, {{ViewFileSystem}} does not support mounting a filesystem on the
root (ie. /). Therefore, it's not really possible to "guess" a default since
the underlying mounts may have different defaults. Even if a filesystem can be
mounted on the root, returning the defaults of that fs is wrong since a
union/merge/whatever-it-is-called mount of another fs may mean the intended
path's resolved fs has different values. Basically a {{Path}} really needs to
be supplied so the mount can be fully resolved.
Multi-mount filesystems break the semantics of these apis designed around the
assumption of a single filesystem. Unfortunately this means there's going to
be a hopefully not too painful bump in the road for users depending on these
apis.
Unfortunately it also appears that {{getDefaultReplication()}} and
{{getDefaultBlockSize()}} weren't marked as internally limited/private, yet
externally deprecated. Otherwise users may have a better idea of why their
code is breaking. We may want to consider adding those annotations.
> FileSystem#getDefaultBlockSize and Replication don't use the given path
> -----------------------------------------------------------------------
>
> Key: HADOOP-8422
> URL: https://issues.apache.org/jira/browse/HADOOP-8422
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs
> Affects Versions: 1.0.3
> Reporter: Eli Collins
> Priority: Minor
>
> The javadocs for FileSystem#getDefaultBlockSize and
> FileSystem#getDefaultReplication claim that "The given path will be used to
> locate the actual filesystem" however they both ignore the path.
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