[#1086] [Doc] Simplify the Gluten code and add the doc (#1322)

* gluten integrate for branch-0.8

* spotless check

* add WriteBufferManagerTest test

* todo

* remove  addPartition method, add some docs

Author: summaryzb

README.md

@@ -258,6 +258,16 @@ After apply the patch and rebuild spark, add following configuration in spark co
   spark.dynamicAllocation.enabled true
   ```
 
+### Support Spark Columnar Shuffle with Gluten
+To support spark columnar shuffle with Uniffle, use Gluten client
+refer to [Gluten Project](https://github.com/oap-project/gluten)
+
+Update Spark conf to enable integration of Uniffle with Gluten:
+  ```
+  spark.plugins io.glutenproject.GlutenPlugin
+  spark.shuffle.manager org.apache.spark.shuffle.gluten.uniffle.GlutenRssShuffleManager
+  ```
+
 ### Deploy MapReduce Client
 
 1. Add client jar to the classpath of each NodeManager, e.g., <HADOOP>/share/hadoop/mapreduce/

client-spark/spark3/src/main/java/org/apache/spark/shuffle/writer/RssShuffleWriter.java

@@ -86,14 +86,14 @@ public class RssShuffleWriter<K, V, C> extends ShuffleWriter<K, V> {
   private final Map<Integer, List<ShuffleServerInfo>> partitionToServers;
   private final Set<ShuffleServerInfo> shuffleServersForData;
   private final long[] partitionLengths;
-  private final boolean isMemoryShuffleEnabled;
   private final Function<String, Boolean> taskFailureCallback;
   private final Set<Long> blockIds = Sets.newConcurrentHashSet();
 
   /** used by columnar rss shuffle writer implementation */
   protected final long taskAttemptId;
 
   protected final ShuffleWriteMetrics shuffleWriteMetrics;
+  protected final boolean isMemoryShuffleEnabled;
 
   private final BlockingQueue<Object> finishEventQueue = new LinkedBlockingQueue<>();
 
@@ -213,7 +213,7 @@ public void write(Iterator<Product2<K, V>> records) throws IOException {
     }
   }
 
-  private void writeImpl(Iterator<Product2<K, V>> records) {
+  protected void writeImpl(Iterator<Product2<K, V>> records) throws IOException {
     List<ShuffleBlockInfo> shuffleBlockInfos;
     boolean isCombine = shuffleDependency.mapSideCombine();
     Function1<V, C> createCombiner = null;
@@ -243,7 +243,7 @@ private void writeImpl(Iterator<Product2<K, V>> records) {
       processShuffleBlockInfos(shuffleBlockInfos);
     }
     long checkStartTs = System.currentTimeMillis();
-    checkBlockSendResult(blockIds);
+    internalCheckBlockSendResult();
     long commitStartTs = System.currentTimeMillis();
     long checkDuration = commitStartTs - checkStartTs;
     if (!isMemoryShuffleEnabled) {
@@ -309,6 +309,10 @@ protected List<CompletableFuture<Long>> postBlockEvent(
     return futures;
   }
 
+  protected void internalCheckBlockSendResult() {
+    checkBlockSendResult(blockIds);
+  }
+
   @VisibleForTesting
   protected void checkBlockSendResult(Set<Long> blockIds) {
     boolean interrupted = false;