利用<code>TaskContext.getPartitionId()</code>获取分区Id。
<pre><code class="lang-java">rdd.partitionBy(partitioner)
 .foreachPartition(iter-&gt;{
 int id=TaskContext.getPartitionId();
 StringBuilder sb = new StringBuilder();
 sb.append("Pid=").append(id);
 while(iter.hasNext()){
 sb.append(", ").append(iter.next().toString());
 }
 System.out.println(sb.toString());
 });
</code></pre>

利用`TaskContext.getPartitionId()`获取分区Id。

```java
rdd.partitionBy(partitioner)
   .foreachPartition(iter->{
      int id=TaskContext.getPartitionId();
      StringBuilder sb = new StringBuilder();
      sb.append("Pid=").append(id);
      while(iter.hasNext()){
        sb.append(", ").append(iter.next().toString());
      }
      System.out.println(sb.toString());
    });
```

Spark RDD如何获取TaskId