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

    https://github.com/apache/nifi/pull/1115#discussion_r84713334
  
    --- Diff: 
nifi-commons/nifi-processor-utilities/src/main/java/org/apache/nifi/processor/util/bin/BinFiles.java
 ---
    @@ -273,25 +262,26 @@ private int binFlowFiles(final ProcessContext 
context, final ProcessSessionFacto
                 }
     
                 final ProcessSession session = sessionFactory.createSession();
    -            FlowFile flowFile = session.get();
    -            if (flowFile == null) {
    +            final List<FlowFile> flowFiles = session.get(1000);
    +            if (flowFiles.isEmpty()) {
                     break;
                 }
     
    -            flowFile = this.preprocessFlowFile(context, session, flowFile);
    -
    -            String groupId = this.getGroupId(context, flowFile);
    -
    -            final boolean binned = binManager.offer(groupId, flowFile, 
session);
    -
    -            // could not be added to a bin -- probably too large by 
itself, so create a separate bin for just this guy.
    -            if (!binned) {
    -                Bin bin = new Bin(0, Long.MAX_VALUE, 0, Integer.MAX_VALUE, 
null);
    -                bin.offer(flowFile, session);
    -                this.readyBins.add(bin);
    +            final Map<String, List<FlowFile>> flowFileGroups = new 
HashMap<>();
    +            for (FlowFile flowFile : flowFiles) {
    +                flowFile = this.preprocessFlowFile(context, session, 
flowFile);
    +                final String groupingIdentifier = getGroupId(context, 
flowFile);
    +                flowFileGroups.computeIfAbsent(groupingIdentifier, id -> 
new ArrayList<>()).add(flowFile);
    --- End diff --
    
    Given that you're not really computing anything in the provided function 
and simply returning an empty list wouldn't this be more appropriate
    ```
    flowFileGroups.putIfAbsent(groupingIdentifier, new 
ArrayList<>()).add(flowFile);
    ```


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