[3/6] mesos git commit: Cancelled the disk usage collection if no longer needed.

[ji...@apache.org]

Cancelled the disk usage collection if no longer needed.

We actively cancel the disk usage collection if its result is no
longer needed. This is a performance optimization.

Review: https://reviews.apache.org/r/58642


Project: http://git-wip-us.apache.org/repos/asf/mesos/repo
Commit: http://git-wip-us.apache.org/repos/asf/mesos/commit/c0cfacfb
Tree: http://git-wip-us.apache.org/repos/asf/mesos/tree/c0cfacfb
Diff: http://git-wip-us.apache.org/repos/asf/mesos/diff/c0cfacfb

Branch: refs/heads/master
Commit: c0cfacfb134f74ff35f48e36af2f914e5530057d
Parents: d680ff6
Author: Jie Yu <yu...@gmail.com>
Authored: Fri Apr 21 15:24:10 2017 -0700
Committer: Jie Yu <yu...@gmail.com>
Committed: Wed Apr 26 13:41:53 2017 -0700

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 src/slave/containerizer/mesos/isolators/posix/disk.cpp | 2 ++
 1 file changed, 2 insertions(+)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/mesos/blob/c0cfacfb/src/slave/containerizer/mesos/isolators/posix/disk.cpp
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diff --git a/src/slave/containerizer/mesos/isolators/posix/disk.cpp b/src/slave/containerizer/mesos/isolators/posix/disk.cpp
index 127f490..126344e 100644
--- a/src/slave/containerizer/mesos/isolators/posix/disk.cpp
+++ b/src/slave/containerizer/mesos/isolators/posix/disk.cpp
@@ -261,6 +261,8 @@ Future<Nothing> PosixDiskIsolatorProcess::update(
   // Remove paths that we no longer interested in.
   foreach (const string& path, info->paths.keys()) {
     if (!quotas.contains(path)) {
+      // Cancel the usage collection as we are no longer interested.
+      info->paths[path].usage.discard();
       info->paths.erase(path);
     }
   }