zhangjun0x01 commented on a change in pull request #3122:
URL: https://github.com/apache/hudi/pull/3122#discussion_r655204771



##########
File path: 
hudi-hadoop-mr/src/main/java/org/apache/hudi/hadoop/utils/HoodieRealtimeInputFormatUtils.java
##########
@@ -165,16 +165,20 @@
         Map<String, List<HoodieBaseFile>> groupedInputSplits = 
partitionsToParquetSplits.get(partitionPath).stream()
             .collect(Collectors.groupingBy(file -> 
FSUtils.getFileId(file.getFileStatus().getPath().getName())));
         latestFileSlices.forEach(fileSlice -> {
-          List<HoodieBaseFile> dataFileSplits = 
groupedInputSplits.get(fileSlice.getFileId());
-          dataFileSplits.forEach(split -> {
-            try {
-              List<String> logFilePaths = 
fileSlice.getLogFiles().sorted(HoodieLogFile.getLogFileComparator())
-                  .map(logFile -> 
logFile.getPath().toString()).collect(Collectors.toList());
-              resultMap.put(split, logFilePaths);
-            } catch (Exception e) {
-              throw new HoodieException("Error creating hoodie real time split 
", e);
-            }
-          });
+          final String fileId = fileSlice.getFileId();
+          // filter out the file group that has only logs (say the index is 
global).
+          if (groupedInputSplits.containsKey(fileId)) {
+            List<HoodieBaseFile> dataFileSplits = 
groupedInputSplits.get(fileId);
+            dataFileSplits.forEach(split -> {
+              try {
+                List<String> logFilePaths = 
fileSlice.getLogFiles().sorted(HoodieLogFile.getLogFileComparator())
+                    .map(logFile -> 
logFile.getPath().toString()).collect(Collectors.toList());
+                resultMap.put(split, logFilePaths);
+              } catch (Exception e) {
+                throw new HoodieException("Error creating hoodie real time 
split ", e);

Review comment:
       nit : Should we modify the exception message so that when throw an 
exception, we can distinguish it from the exception in the `getRealtimeSplits` 
method?




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