HBASE-23231 ReplicationSource do not update metrics after refresh (#778)

Signed-off-by: stack <stack@apache.org>
Signed-off-by: Duo Zhang <zhangduo@apache.org>

Author: binlijin

hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSource.java

@@ -555,7 +555,12 @@ public void terminate(String reason, Exception cause) {
     terminate(reason, cause, true);
   }
 
-  public void terminate(String reason, Exception cause, boolean join) {
+  @Override
+  public void terminate(String reason, Exception cause, boolean clearMetrics) {
+    terminate(reason, cause, clearMetrics, true);
+  }
+
+  public void terminate(String reason, Exception cause, boolean clearMetrics, boolean join) {
     if (cause == null) {
       LOG.info("{} Closing source {} because: {}", logPeerId(), this.queueId, reason);
     } else {
@@ -616,7 +621,9 @@ public void terminate(String reason, Exception cause, boolean join) {
         }
       }
     }
-    this.metrics.clear();
+    if (clearMetrics) {
+      this.metrics.clear();
+    }
   }
 
   @Override

hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSourceInterface.java

@@ -91,6 +91,14 @@ void addHFileRefs(TableName tableName, byte[] family, List<Pair<Path, Path>> pai
    */
   void terminate(String reason, Exception cause);
 
+  /**
+   * End the replication
+   * @param reason why it's terminating
+   * @param cause the error that's causing it
+   * @param clearMetrics removes all metrics about this Source
+   */
+  void terminate(String reason, Exception cause, boolean clearMetrics);
+
   /**
    * Get the current log that's replicated
    * @return the current log

hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSourceManager.java

@@ -380,7 +380,8 @@ public void refreshSources(String peerId) throws IOException {
       ReplicationSourceInterface toRemove = this.sources.put(peerId, src);
       if (toRemove != null) {
         LOG.info("Terminate replication source for " + toRemove.getPeerId());
-        toRemove.terminate(terminateMessage);
+        // Do not clear metrics
+        toRemove.terminate(terminateMessage, null, false);
       }
       for (SortedSet<String> walsByGroup : walsById.get(peerId).values()) {
         walsByGroup.forEach(wal -> {

hbase-server/src/test/java/org/apache/hadoop/hbase/replication/ReplicationSourceDummy.java

@@ -85,7 +85,14 @@ public void terminate(String reason) {
 
   @Override
   public void terminate(String reason, Exception e) {
-    this.metrics.clear();
+    terminate(reason, e, true);
+  }
+
+  @Override
+  public void terminate(String reason, Exception e, boolean clearMetrics) {
+    if (clearMetrics) {
+      this.metrics.clear();
+    }
   }
 
   @Override