[GitHub] [hudi] aditiwari01 commented on a change in pull request #4468: [HUDI-3130] Fixing Hive getSchema for RT tables addressing different partitions having different schemas

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aditiwari01 commented on a change in pull request #4468:
URL: https://github.com/apache/hudi/pull/4468#discussion_r802299209



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File path: hudi-hadoop-mr/src/main/java/org/apache/hudi/hadoop/realtime/AbstractRealtimeRecordReader.java
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@@ -77,19 +74,17 @@ private boolean usesCustomPayload() {
   }
 
   /**
-   * Goes through the log files in reverse order and finds the schema from the last available data block. If not, falls
+   * Gets schema from HoodieTableMetaClient. If not, falls
    * back to the schema from the latest parquet file. Finally, sets the partition column and projection fields into the
    * job conf.
    */
-  private void init() throws IOException {
-    Schema schemaFromLogFile = LogReaderUtils.readLatestSchemaFromLogFiles(split.getBasePath(), split.getDeltaLogFiles(), jobConf);
-    if (schemaFromLogFile == null) {
-      writerSchema = InputSplitUtils.getBaseFileSchema((FileSplit)split, jobConf);
-      LOG.info("Writer Schema From Parquet => " + writerSchema.getFields());
-    } else {
-      writerSchema = schemaFromLogFile;
-      LOG.info("Writer Schema From Log => " + writerSchema.toString(true));
-    }
+  private void init() throws Exception {
+
+    HoodieTableMetaClient metaClient = HoodieTableMetaClient.builder().setConf(split.getPath().getFileSystem(jobConf).getConf()).setBasePath(split.getBasePath()).build();
+    TableSchemaResolver schemaUtil = new TableSchemaResolver(metaClient);

Review comment:
       Would it be fine if I get the schema from Metaclient in InputFormat (HoodieCombineHiveInputFormat) once and pass the schema to all the record readers from there?




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