arp7 commented on a change in pull request #714: HDDS-1406. Avoid usage of 
commonPool in RatisPipelineUtils.
URL: https://github.com/apache/hadoop/pull/714#discussion_r278759739
 
 

 ##########
 File path: 
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/pipeline/RatisPipelineUtils.java
 ##########
 @@ -146,19 +165,37 @@ private static void callRatisRpc(List<DatanodeDetails> 
datanodes,
         SecurityConfig(ozoneConf));
     final TimeDuration requestTimeout =
         RatisHelper.getClientRequestTimeout(ozoneConf);
-    datanodes.parallelStream().forEach(d -> {
-      final RaftPeer p = RatisHelper.toRaftPeer(d);
-      try (RaftClient client = RatisHelper
-          .newRaftClient(SupportedRpcType.valueOfIgnoreCase(rpcType), p,
-              retryPolicy, maxOutstandingRequests, tlsConfig, requestTimeout)) 
{
-        rpc.accept(client, p);
-      } catch (IOException ioe) {
-        String errMsg =
-            "Failed invoke Ratis rpc " + rpc + " for " + d.getUuid();
-        LOG.error(errMsg, ioe);
-        exceptions.add(new IOException(errMsg, ioe));
-      }
-    });
+    try {
+      POOL.submit(() -> {
+        datanodes.parallelStream().forEach(d -> {
+          final RaftPeer p = RatisHelper.toRaftPeer(d);
+          try (RaftClient client = RatisHelper
+              .newRaftClient(SupportedRpcType.valueOfIgnoreCase(rpcType), p,
+                  retryPolicy, maxOutstandingRequests, tlsConfig,
+                  requestTimeout)) {
+            rpc.accept(client, p);
+          } catch (IOException ioe) {
+            String errMsg =
+                "Failed invoke Ratis rpc " + rpc + " for " + d.getUuid();
+            LOG.error(errMsg, ioe);
+            exceptions.add(new IOException(errMsg, ioe));
+          }
+        });
+      }).get();
+    } catch (ExecutionException ex) {
+      LOG.error("Execution exception occurred during createPipeline", ex);
+      throw new IOException("Execution exception occurred during " +
+          "createPipeline", ex);
+    } catch (RejectedExecutionException ex) {
+      LOG.error("RejectedExecutionException, occurred during " +
 
 Review comment:
   Same here, don't log.

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