osd/PG: move down peers out from peer_purged

In purge_strays(), we'll aggressively clear stray_set and
add all related peers into peer_purged.

However, if the corrsponding peer is down and becomes
up again, (unconditionally) adding it to peer_purged
will prevent primary from re-purging it.
(See Active::react(const MNotifyRec& notevt))

On consuming a new osdmap, let's move any down peers out from
peer_purged simutaneously. This way we can lower the risk
of leaving any leftover PGs behind.

Related-to: http://tracker.ceph.com/issues/38931
Signed-off-by: xie xingguo <xie.xingguo@zte.com.cn>

diff --git a/src/osd/PG.cc b/src/osd/PG.cc
index bec5666ab9e4e36dd8a6df38ce26d5201039229f..0a01bb88599db536c48b50cd7552dec1b05cc32b 100644 (file)
--- a/src/osd/PG.cc
+++ b/src/osd/PG.cc
@@ -980,6 +980,7 @@ void PG::remove_down_peer_info(const OSDMapRef osdmap)
       peer_missing.erase(p->first);
       peer_log_requested.erase(p->first);
       peer_missing_requested.erase(p->first);
+      peer_purged.erase(p->first); // so we can re-purge if necessary
       peer_info.erase(p++);
       removed = true;
     } else