[#1721] fix(coordinator): classCastExpection of boolean->String with …

…yaml style remote client conf (#1722)

### What changes were proposed in this pull request?

fix classCastExpection of boolean->String with yaml style remote client conf

### Why are the changes needed?

Fix: #1721 

### Does this PR introduce _any_ user-facing change?


No.

### How was this patch tested?

Unit tests

coordinator/src/main/java/org/apache/uniffle/coordinator/conf/YamlClientConfParser.java

@@ -22,6 +22,7 @@
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.stream.Collectors;
 
 import org.apache.commons.io.IOUtils;
 import org.apache.hadoop.conf.Configuration;
@@ -58,7 +59,11 @@ public ClientConf tryParse(InputStream fileInputStream) throws Exception {
 
   private Map<String, String> parseKVItems(Object confRaw) throws Exception {
     if (confRaw instanceof Map) {
-      return (Map<String, String>) confRaw;
+      return ((Map<?, ?>) confRaw)
+          .entrySet().stream()
+              .collect(
+                  Collectors.toMap(
+                      x -> String.valueOf(x.getKey()), x -> String.valueOf(x.getValue())));
     }
 
     // todo: currently only xml format is supported

coordinator/src/test/java/org/apache/uniffle/coordinator/conf/YamlClientConfParserTest.java

@@ -32,6 +32,11 @@ public void testFromFile() throws Exception {
             getClass().getClassLoader().getResource("dynamicClientConf.yaml").openStream());
     assertEquals("v1", conf.getRssClientConf().get("k1"));
     assertEquals("v2", conf.getRssClientConf().get("k2"));
+    assertEquals("true", conf.getRssClientConf().get("k3"));
+    assertEquals("false", conf.getRssClientConf().get("k4"));
+    assertEquals("1", conf.getRssClientConf().get("k5"));
+    assertEquals("2", conf.getRssClientConf().get("k6"));
+
     assertEquals(
         "v1,v2,v3", conf.getRemoteStorageInfos().get("hdfs://a-ns01").getConfItems().get("k1"));
     assertEquals("v1", conf.getRemoteStorageInfos().get("hdfs://x-ns01").getConfItems().get("k1"));

coordinator/src/test/resources/dynamicClientConf.yaml

@@ -18,6 +18,10 @@
 rssClientConf:
   k1: v1
   k2: v2
+  k3: true
+  k4: false
+  k5: 1
+  k6: 2
 
 remoteStorageInfos:
   hdfs://a-ns01: |+