Merge PR #23062 into master

* refs/pull/23062/head:
	mds: dump recent events on respawn

Reviewed-by: Sage Weil <sage@redhat.com>

diff --cc src/mds/MDSDaemon.cc
index 7bf62ca036685faf61589ebe07ef225187f0f289,8cbcf9fac3d8f7febcfeb132ff551cad4f5b26a1..49281a5ce90485e4805c364d71c5d9fc0f9a6b27
--- 1/src/mds/MDSDaemon.cc
--- 2/src/mds/MDSDaemon.cc
+++ b/src/mds/MDSDaemon.cc
@@@ -1081,8 -1080,12 +1081,12 @@@ void MDSDaemon::suicide(
  
  void MDSDaemon::respawn()
  {
 -  dout(1) << "respawn" << dendl;
 +  dout(1) << "respawn!" << dendl;
  
+   /* Dump recent in case the MDS was stuck doing something which caused it to
+    * be removed from the MDSMap leading to respawn. */
+   g_ceph_context->_log->dump_recent();
+ 
    char *new_argv[orig_argc+1];
    dout(1) << " e: '" << orig_argv[0] << "'" << dendl;
    for (int i=0; i<orig_argc; i++) {