RANGER-4390: creating another row batch causes null pointer exception as vectorizedRowBatchMap has old batch references and gets garbage collected (#298)

diff --git a/agents-audit/src/main/java/org/apache/ranger/audit/utils/ORCFileUtil.java b/agents-audit/src/main/java/org/apache/ranger/audit/utils/ORCFileUtil.java
index 62f8794..f73df2c 100644
--- a/agents-audit/src/main/java/org/apache/ranger/audit/utils/ORCFileUtil.java
+++ b/agents-audit/src/main/java/org/apache/ranger/audit/utils/ORCFileUtil.java
@@ -125,11 +125,6 @@
             logger.debug("==> ORCFileUtil.log() : EventSize: " + eventBatchSize + "ORC bufferSize:" + orcBufferSize );
         }
 
-        //increase the batch size according to event size, so it can accomodate all the events.
-        if (eventBatchSize > orcBufferSize) {
-            batch  = schema.createRowBatch(orcBufferSize);
-        }
-
         try {
             for(AuthzAuditEvent event : events) {
                 int row = batch.size++;