Github user kumarvishal09 commented on a diff in the pull request:

    https://github.com/apache/incubator-carbondata/pull/460#discussion_r93839478
  
    --- Diff: 
core/src/main/java/org/apache/carbondata/scan/executor/impl/AbstractQueryExecutor.java
 ---
    @@ -470,7 +471,12 @@ private AggregatorInfo 
getAggregatorInfoForBlock(QueryModel queryModel,
        */
       @Override public void finish() throws QueryExecutionException {
         if (null != queryProperties.executorService) {
    -      queryProperties.executorService.shutdownNow();
    +      queryProperties.executorService.shutdown();
    +      try {
    +        queryProperties.executorService.awaitTermination(1, 
TimeUnit.HOURS);
    --- End diff --
    
    Its a max waiting time for completing the scanning if processing is done, 
then it will come out automatically, so i think it is ok


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