commit b5e07be0598d5836ddff05996a4b1274cd8184ec
author Andrew Wong <awong@apache.org> Thu Dec 05 00:28:14 2019 -0800
committer Andrew Wong <awong@cloudera.com> Fri Dec 06 21:52:09 2019 +0000
tree b2730fe839b75eb5a900e6d175987eafcd531e1f
parent e5ab399e0f2545214d9fdc6f6c04a67540a9aadc

fs: rename PathInstance-related things

I'm expecting the directory management code to be reused for WAL
directories, and I've sometimes found it mildly annoying that we have
different nomenclature for path instances, directories, and block
managers in the same area (mostly in the PathInstances). So thought I'd
rename some things now to make some things more straight-forward:

* PathInstanceMetadataFile -> DirInstanceMetadataFile
* PathInstanceMetadataPB -> DirInstanceMetadataPB
* PathSetPB -> DirSetPB
* block_manager_type -> dir_type (in the context of instance files only)
* block_manager_util -> dir_util

Along the way, I modernized our usage of the DataDir threadpool when
calling DataDirManager::Open().

Change-Id: I89049fafe149d535d584e7d4cd2497c298c16043
Reviewed-on: http://gerrit.cloudera.org:8080/14862
Tested-by: Kudu Jenkins
Reviewed-by: Adar Dembo <adar@cloudera.com>