HBASE-25839 Bulk Import fails with java.io.IOException: Type mismatch in value from map

Author: srinireddy2020

hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/Import.java

@@ -202,8 +202,11 @@ public CellWritableComparable(Cell kv) {
 
     @Override
     public void write(DataOutput out) throws IOException {
-      out.writeInt(PrivateCellUtil.estimatedSerializedSizeOfKey(kv));
-      out.writeInt(0);
+      int keyLen = PrivateCellUtil.estimatedSerializedSizeOfKey(kv);
+      int valueLen = 0; // We avoid writing value here. So just serialize as if an empty value.
+      out.writeInt(keyLen + valueLen + KeyValue.KEYVALUE_INFRASTRUCTURE_SIZE);
+      out.writeInt(keyLen);
+      out.writeInt(valueLen);
       PrivateCellUtil.writeFlatKey(kv, out);
     }
 
@@ -413,7 +416,7 @@ public void map(ImmutableBytesWritable row, Result value, Context context) throw
             // skip if we filtered it out
             if (kv == null) continue;
             Cell ret = convertKv(kv, cfRenameMap);
-            context.write(new CellWritableComparable(ret), ret);
+            context.write(new CellWritableComparable(ret), new MapReduceExtendedCell(ret));
           }
         }
       } catch (InterruptedException e) {

hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/mapreduce/TestImportExport.java

@@ -508,6 +508,47 @@ public void testWithFilter() throws Throwable {
     importTable.close();
   }
 
+  /**
+   * Create a simple table, run an Export Job on it, Import with bulk output and enable largeResult
+   */
+  @Test
+  public void testBulkImportAndLargeResult() throws Throwable {
+    // Create simple table to export
+    TableDescriptor desc = TableDescriptorBuilder
+      .newBuilder(TableName.valueOf(name.getMethodName()))
+      .setColumnFamily(ColumnFamilyDescriptorBuilder.newBuilder(FAMILYA).setMaxVersions(5).build())
+      .build();
+    UTIL.getAdmin().createTable(desc);
+    Table exportTable = UTIL.getConnection().getTable(desc.getTableName());
+
+    Put p1 = new Put(ROW1);
+    p1.addColumn(FAMILYA, QUAL, now, QUAL);
+
+    // Having another row would actually test the filter.
+    Put p2 = new Put(ROW2);
+    p2.addColumn(FAMILYA, QUAL, now, QUAL);
+
+    exportTable.put(Arrays.asList(p1, p2));
+
+    // Export the simple table
+    String[] args = new String[] { name.getMethodName(), FQ_OUTPUT_DIR, "1000" };
+    assertTrue(runExport(args));
+
+    // Import to a new table
+    final String IMPORT_TABLE = name.getMethodName() + "import";
+    desc = TableDescriptorBuilder.newBuilder(TableName.valueOf(IMPORT_TABLE))
+      .setColumnFamily(ColumnFamilyDescriptorBuilder.newBuilder(FAMILYA).setMaxVersions(5).build())
+      .build();
+    UTIL.getAdmin().createTable(desc);
+
+    String O_OUTPUT_DIR =
+      new Path(OUTPUT_DIR + 1).makeQualified(FileSystem.get(UTIL.getConfiguration())).toString();
+
+    args = new String[] { "-D" + Import.BULK_OUTPUT_CONF_KEY + "=" + O_OUTPUT_DIR,
+      "-D" + Import.HAS_LARGE_RESULT + "=" + true, IMPORT_TABLE, FQ_OUTPUT_DIR, "1000" };
+    assertTrue(runImport(args));
+  }
+
   /**
    * Count the number of keyvalues in the specified table with the given filter
    * @param table the table to scan