diff --git a/server/src/main/java/io/druid/timeline/partition/LinearShardSpec.java b/server/src/main/java/io/druid/timeline/partition/LinearShardSpec.java
index 5b716b20a73..ea7d3256229 100644
--- a/server/src/main/java/io/druid/timeline/partition/LinearShardSpec.java
+++ b/server/src/main/java/io/druid/timeline/partition/LinearShardSpec.java
@@ -24,8 +24,6 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import com.google.common.base.Preconditions;
 import io.druid.data.input.InputRow;
 
-import java.util.Map;
-
 public class LinearShardSpec implements ShardSpec
 {
   private int partitionNum;
@@ -53,4 +51,12 @@ public class LinearShardSpec implements ShardSpec
   public boolean isInChunk(InputRow inputRow) {
     return true;
   }
+
+  @Override
+  public String toString()
+  {
+    return "LinearShardSpec{" +
+           "partitionNum=" + partitionNum +
+           '}';
+  }
 }
diff --git a/server/src/main/java/io/druid/timeline/partition/NumberedShardSpec.java b/server/src/main/java/io/druid/timeline/partition/NumberedShardSpec.java
index 7c09787b5cc..73a3437a80a 100644
--- a/server/src/main/java/io/druid/timeline/partition/NumberedShardSpec.java
+++ b/server/src/main/java/io/druid/timeline/partition/NumberedShardSpec.java
@@ -25,8 +25,6 @@ import com.fasterxml.jackson.annotation.JsonProperty;
 import com.google.common.base.Preconditions;
 import io.druid.data.input.InputRow;
 
-import java.util.Map;
-
 public class NumberedShardSpec implements ShardSpec
 {
   @JsonIgnore
@@ -71,4 +69,13 @@ public class NumberedShardSpec implements ShardSpec
   {
     return true;
   }
+
+  @Override
+  public String toString()
+  {
+    return "NumberedShardSpec{" +
+           "partitionNum=" + partitionNum +
+           ", partitions=" + partitions +
+           '}';
+  }
 }