mds: limit run time of load balancer

Signed-off-by: "Yan, Zheng" <zyan@redhat.com>
(cherry picked from commit fc0d340876fbcd7d1d262c00b987849c052a296d)

diff --git a/src/mds/MDBalancer.cc b/src/mds/MDBalancer.cc
index 435d546d42f26766de20bfbeacad565854555e66..83de7910648aaabd8cfbd71b012279f9623b4f8c 100644 (file)
--- a/src/mds/MDBalancer.cc
+++ b/src/mds/MDBalancer.cc
@@ -969,6 +969,13 @@ void MDBalancer::find_exports(CDir *dir,
                               double& have,
                               set<CDir*>& already_exporting)
 {
+  utime_t now = ceph_clock_now();
+  if ((double)(now - rebalance_time) > 0.1) {
+    derr << " balancer runs too long"  << dendl_impl;
+    have = amount;
+    return;
+  }
+
   assert(dir->is_auth());
 
   double need = amount - have;