HDFS-14811. RBF: TestRouterRpc#testErasureCoding is flaky. Contributed by Chen Zhang.

hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/router/TestRouterRpc.java

@@ -17,6 +17,7 @@
  */
 package org.apache.hadoop.hdfs.server.federation.router;
 
+import static org.apache.hadoop.hdfs.DFSConfigKeys.DFS_NAMENODE_REDUNDANCY_CONSIDERLOAD_KEY;
 import static org.apache.hadoop.hdfs.server.federation.FederationTestUtils.addDirectory;
 import static org.apache.hadoop.hdfs.server.federation.FederationTestUtils.countContents;
 import static org.apache.hadoop.hdfs.server.federation.FederationTestUtils.createFile;
@@ -196,8 +197,14 @@ public class TestRouterRpc {
 
   @BeforeClass
   public static void globalSetUp() throws Exception {
+    Configuration namenodeConf = new Configuration();
+    // It's very easy to become overloaded for some specific dn in this small
+    // cluster, which will cause the EC file block allocation failure. To avoid
+    // this issue, we disable considerLoad option.
+    namenodeConf.setBoolean(DFS_NAMENODE_REDUNDANCY_CONSIDERLOAD_KEY, false);
     cluster = new MiniRouterDFSCluster(false, NUM_SUBCLUSTERS);
     cluster.setNumDatanodesPerNameservice(NUM_DNS);
+    cluster.addNamenodeOverrides(namenodeConf);
     cluster.setIndependentDNs();
 
     Configuration conf = new Configuration();