HBASE-27491: do not clear cache on RejectedExecutionException

hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncRequestFutureImpl.java

@@ -218,13 +218,13 @@ public void run() {
         } catch (IOException e) {
           // The service itself failed . It may be an error coming from the communication
           // layer, but, as well, a functional error raised by the server.
-          receiveGlobalFailure(multiAction, server, numAttempt, e);
+          receiveGlobalFailure(multiAction, server, numAttempt, e, true);
           return;
         } catch (Throwable t) {
           // This should not happen. Let's log & retry anyway.
           LOG.error("id=" + asyncProcess.id + ", caught throwable. Unexpected."
             + " Retrying. Server=" + server + ", tableName=" + tableName, t);
-          receiveGlobalFailure(multiAction, server, numAttempt, t);
+          receiveGlobalFailure(multiAction, server, numAttempt, t, true);
           return;
         }
         if (res.type() == AbstractResponse.ResponseType.MULTI) {
@@ -520,6 +520,7 @@ private RegionLocations findAllLocationsOrFail(Action action, boolean useCache)
    */
   void sendMultiAction(Map<ServerName, MultiAction> actionsByServer, int numAttempt,
     List<Action> actionsForReplicaThread, boolean reuseThread) {
+    boolean clearServerCache = true;
     // Run the last item on the same thread if we are already on a send thread.
     // We hope most of the time it will be the only item, so we can cut down on threads.
     int actionsRemaining = actionsByServer.size();
@@ -554,14 +555,16 @@ void sendMultiAction(Map<ServerName, MultiAction> actionsByServer, int numAttemp
               // let's secure this a little.
               LOG.warn("id=" + asyncProcess.id + ", task rejected by pool. Unexpected." + " Server="
                 + server.getServerName(), t);
+              // Do not update cache if exception is from failing to submit action to thread pool
+              clearServerCache = false;
             } else {
               // see #HBASE-14359 for more details
               LOG.warn("Caught unexpected exception/error: ", t);
             }
             asyncProcess.decTaskCounters(multiAction.getRegions(), server);
             // We're likely to fail again, but this will increment the attempt counter,
             // so it will finish.
-            receiveGlobalFailure(multiAction, server, numAttempt, t);
+            receiveGlobalFailure(multiAction, server, numAttempt, t, clearServerCache);
           }
         }
       }
@@ -711,21 +714,28 @@ private void failAll(MultiAction actions, ServerName server, int numAttempt,
    * @param t          the throwable (if any) that caused the resubmit
    */
   private void receiveGlobalFailure(MultiAction rsActions, ServerName server, int numAttempt,
-    Throwable t) {
+    Throwable t, boolean clearServerCache) {
     errorsByServer.reportServerError(server);
     Retry canRetry = errorsByServer.canTryMore(numAttempt) ? Retry.YES : Retry.NO_RETRIES_EXHAUSTED;
 
-    cleanServerCache(server, t);
+    // Do not update cache if exception is from failing to submit action to thread pool
+    if (clearServerCache) {
+      cleanServerCache(server, t);
+    }
+
     int failed = 0;
     int stopped = 0;
     List<Action> toReplay = new ArrayList<>();
     for (Map.Entry<byte[], List<Action>> e : rsActions.actions.entrySet()) {
       byte[] regionName = e.getKey();
       byte[] row = e.getValue().get(0).getAction().getRow();
       // Do not use the exception for updating cache because it might be coming from
-      // any of the regions in the MultiAction.
-      updateCachedLocations(server, regionName, row,
-        ClientExceptionsUtil.isMetaClearingException(t) ? null : t);
+      // any of the regions in the MultiAction and do not update cache if exception is
+      // from failing to submit action to thread pool
+      if (clearServerCache) {
+        updateCachedLocations(server, regionName, row,
+          ClientExceptionsUtil.isMetaClearingException(t) ? null : t);
+      }
       for (Action action : e.getValue()) {
         Retry retry =
           manageError(action.getOriginalIndex(), action.getAction(), canRetry, t, server);