youngxinler commented on code in PR #6571:
URL: https://github.com/apache/iceberg/pull/6571#discussion_r1083463759


##########
docs/java-api.md:
##########
@@ -147,6 +147,53 @@ t.newAppend().appendFile(data).commit();
 t.commitTransaction();
 ```
 
+### WriteData
+
+The java api can write data into iceberg table.
+
+First write data to the data file, then submit the data file, the data you 
write will take effect in the table.
+
+For example, add 1000 pieces of data to the table.
+
+```java
+GenericAppenderFactory appenderFactory = new 
GenericAppenderFactory(table.schema(), table.spec());
+
+int partitionId = 1, taskId = 1;
+OutputFileFactory outputFileFactory = OutputFileFactory.builderFor(table, 
partitionId, taskId).format(FileFormat.PARQUET).build();
+final PartitionKey partitionKey = new PartitionKey(table.spec(), 
table.spec().schema());
+final InternalRecordWrapper recordWrapper = new 
InternalRecordWrapper(table.schema().asStruct());
+
+// partitionedFanoutWriter will auto partitioned record and create the 
partitioned writer
+PartitionedFanoutWriter<Record> partitionedFanoutWriter = new 
PartitionedFanoutWriter<Record>(table.spec(), FileFormat.PARQUET, 
appenderFactory, outputFileFactory, table.io(), TARGET_FILE_SIZE_IN_BYTES) {

Review Comment:
   done with GenericTaskWriter.



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