HDDS-5531. For Link Buckets avoid showing metadata.

hadoop-hdds/framework/src/main/java/org/apache/hadoop/hdds/server/JsonUtils.java

@@ -21,6 +21,7 @@
 import java.io.IOException;
 import java.util.List;
 
+import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.ObjectWriter;
 import com.fasterxml.jackson.databind.SerializationFeature;
@@ -39,6 +40,7 @@ public final class JsonUtils {
   private static final ObjectWriter WRITTER;
   static {
     MAPPER = new ObjectMapper()
+        .setSerializationInclusion(JsonInclude.Include.NON_NULL)
         .registerModule(new JavaTimeModule())
         .configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
     WRITTER = MAPPER.writerWithDefaultPrettyPrinter();

hadoop-ozone/dist/src/main/smoketest/basic/links.robot

@@ -103,8 +103,14 @@ Bucket list contains links
                         Should Contain              ${result}         dangling-link
 
 Bucket info shows source
-    ${result} =         Execute                     ozone sh bucket info ${target}/link1 | jq -r '.sourceVolume, .sourceBucket' | xargs
-                        Should Be Equal             ${result}    ${source} bucket1
+    ${result} =         Execute                     ozone sh bucket info ${target}/link1
+                        Should Contain              ${result}            ${source}
+                        Should Contain              ${result}            bucket1
+                        Should Contain              ${result}            ${target}
+                        Should Contain              ${result}            link1
+                        Should Contain              ${result}            modificationTime
+                        Should Contain              ${result}            creationTime
+                        Should Not contain          ${result}            metadata
 
 Source and target have separate ACLs
     Execute       ozone sh bucket addacl --acl user:user1:rwxy ${target}/link1

hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/shell/bucket/InfoBucketHandler.java

@@ -24,6 +24,7 @@
 import picocli.CommandLine.Command;
 
 import java.io.IOException;
+import java.time.Instant;
 
 /**
  * Executes Info bucket.
@@ -40,7 +41,56 @@ public void execute(OzoneClient client, OzoneAddress address)
         .getVolume(address.getVolumeName())
         .getBucket(address.getBucketName());
 
-    printObjectAsJson(bucket);
+    if (bucket.getSourceBucket() != null && bucket.getSourceVolume() != null) {
+      printObjectAsJson(new LinkBucket(bucket));
+    } else {
+      printObjectAsJson(bucket);
+    }
+  }
+
+  /**
+   * Class used for link buckets.
+   */
+  private static class LinkBucket {
+    private String volumeName;
+    private String bucketName;
+    private String sourceVolume;
+    private String sourceBucket;
+    private Instant creationTime;
+    private Instant modificationTime;
+
+    LinkBucket(OzoneBucket ozoneBucket) {
+      this.volumeName = ozoneBucket.getVolumeName();
+      this.bucketName = ozoneBucket.getName();
+      this.sourceVolume = ozoneBucket.getSourceVolume();
+      this.sourceBucket = ozoneBucket.getSourceBucket();
+      this.creationTime = ozoneBucket.getCreationTime();
+      this.modificationTime = ozoneBucket.getModificationTime();
+    }
+
+    public String getVolumeName() {
+      return volumeName;
+    }
+
+    public String getBucketName() {
+      return bucketName;
+    }
+
+    public String getSourceVolume() {
+      return sourceVolume;
+    }
+
+    public String getSourceBucket() {
+      return sourceBucket;
+    }
+
+    public Instant getCreationTime() {
+      return creationTime;
+    }
+
+    public Instant getModificationTime() {
+      return modificationTime;
+    }
   }
 
 }