[HUDI-1223] Remove unused UpdateHandler class in HoodieCopyOnWriteTable (#2032)

diff --git a/hudi-client/src/main/java/org/apache/hudi/table/HoodieCopyOnWriteTable.java b/hudi-client/src/main/java/org/apache/hudi/table/HoodieCopyOnWriteTable.java
index 21f8bef..6292e56 100644
--- a/hudi-client/src/main/java/org/apache/hudi/table/HoodieCopyOnWriteTable.java
+++ b/hudi-client/src/main/java/org/apache/hudi/table/HoodieCopyOnWriteTable.java
@@ -32,7 +32,6 @@
 import org.apache.hudi.common.table.timeline.HoodieInstant;
 import org.apache.hudi.common.table.timeline.HoodieTimeline;
 import org.apache.hudi.common.util.Option;
-import org.apache.hudi.common.util.queue.BoundedInMemoryQueueConsumer;
 import org.apache.hudi.config.HoodieWriteConfig;
 import org.apache.hudi.exception.HoodieNotSupportedException;
 import org.apache.hudi.exception.HoodieUpsertException;
@@ -54,7 +53,6 @@
 import org.apache.hudi.table.action.rollback.CopyOnWriteRollbackActionExecutor;
 import org.apache.hudi.table.action.savepoint.SavepointActionExecutor;
 
-import org.apache.avro.generic.GenericRecord;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.log4j.LogManager;
 import org.apache.log4j.Logger;
@@ -203,29 +201,4 @@
     return new CopyOnWriteRestoreActionExecutor(jsc, config, this, restoreInstantTime, instantToRestore).execute();
   }
 
-  /**
-   * Consumer that dequeues records from queue and sends to Merge Handle.
-   */
-  private static class UpdateHandler extends BoundedInMemoryQueueConsumer<GenericRecord, Void> {
-
-    private final HoodieMergeHandle upsertHandle;
-
-    private UpdateHandler(HoodieMergeHandle upsertHandle) {
-      this.upsertHandle = upsertHandle;
-    }
-
-    @Override
-    protected void consumeOneRecord(GenericRecord record) {
-      upsertHandle.write(record);
-    }
-
-    @Override
-    protected void finish() {}
-
-    @Override
-    protected Void getResult() {
-      return null;
-    }
-  }
-
 }