From e7b97eac85d94d739cba9d9a324e9c7319271278 Mon Sep 17 00:00:00 2001
From: Alan Conway <aconway@apache.org>
Date: Thu, 25 Feb 2010 22:07:30 +0000
Subject: Last member of a cluster always has clean store.

When a cluster is reduced to a single broker, it marks its store as
clean regardless of how it is shut down. If we're down to a single
member we know we want to use its store to recover as there are no
others.


git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk/qpid@916475 13f79535-47bb-0310-9956-ffa450edef68
---
 cpp/src/qpid/cluster/Cluster.cpp     | 6 ++++++
 cpp/src/qpid/cluster/StoreStatus.cpp | 6 ++++++
 cpp/src/qpid/cluster/StoreStatus.h   | 6 +++---
 3 files changed, 15 insertions(+), 3 deletions(-)

(limited to 'cpp/src/qpid')

diff --git a/cpp/src/qpid/cluster/Cluster.cpp b/cpp/src/qpid/cluster/Cluster.cpp
index e718819f48..08646e5a6b 100644
--- a/cpp/src/qpid/cluster/Cluster.cpp
+++ b/cpp/src/qpid/cluster/Cluster.cpp
@@ -914,6 +914,12 @@ void Cluster::memberUpdate(Lock& l) {
     size_t size = urls.size();
     failoverExchange->updateUrls(urls);
 
+    if (store.hasStore()) {
+        // Mark store clean if I am the only broker, dirty otherwise.
+        if (size == 1) store.clean(Uuid(true));
+        else store.dirty(clusterId);
+    }
+
     if (size == 1 && lastSize > 1 && state >= CATCHUP) {
         QPID_LOG(notice, *this << " last broker standing, update queue policies");
         lastBroker = true;
diff --git a/cpp/src/qpid/cluster/StoreStatus.cpp b/cpp/src/qpid/cluster/StoreStatus.cpp
index 947f81d596..648fcfbbd5 100644
--- a/cpp/src/qpid/cluster/StoreStatus.cpp
+++ b/cpp/src/qpid/cluster/StoreStatus.cpp
@@ -114,7 +114,12 @@ void StoreStatus::save() {
     }
 }
 
+bool StoreStatus::hasStore() const {
+    return state != framing::cluster::STORE_STATE_NO_STORE;
+}
+
 void StoreStatus::dirty(const Uuid& clusterId_) {
+    if (!hasStore()) return;
     assert(clusterId_);
     clusterId = clusterId_;
     shutdownId = Uuid();
@@ -123,6 +128,7 @@ void StoreStatus::dirty(const Uuid& clusterId_) {
 }
 
 void StoreStatus::clean(const Uuid& shutdownId_) {
+    if (!hasStore()) return;
     assert(shutdownId_);
     state = STORE_STATE_CLEAN_STORE;
     shutdownId = shutdownId_;
diff --git a/cpp/src/qpid/cluster/StoreStatus.h b/cpp/src/qpid/cluster/StoreStatus.h
index 911b3a2ba2..2371f0424e 100644
--- a/cpp/src/qpid/cluster/StoreStatus.h
+++ b/cpp/src/qpid/cluster/StoreStatus.h
@@ -46,14 +46,14 @@ class StoreStatus
     const Uuid& getShutdownId() const { return shutdownId; }
     framing::SequenceNumber getConfigSeq() const { return configSeq; }
 
-    void dirty(const Uuid& start); // Start using the store.
-    void clean(const Uuid& stop); // Stop using the store.
+    void dirty(const Uuid& clusterId);  // Mark the store in use by clusterId.
+    void clean(const Uuid& shutdownId); // Mark the store clean at shutdownId
     void setConfigSeq(framing::SequenceNumber seq); // Update the config seq number.
 
     void load();
     void save();
 
-    bool hasStore() { return state != framing::cluster::STORE_STATE_NO_STORE; }
+    bool hasStore() const;
 
   private:
     framing::cluster::StoreState state;
-- 
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