Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/5849#issuecomment-99628189
stack trace is
```
java.lang.UnsupportedOperationException
at
org.apache.spark.util.collection.ChainedBufferOutputStream.write(ChainedBuffer.scala:137)
at java.io.DataOutputStream.writeByte(DataOutputStream.java:153)
at
org.apache.spark.sql.execution.SparkSqlSerializer2$$anonfun$createSerializationFunction$1.apply(SparkSqlSerializer2.scala:293)
at
org.apache.spark.sql.execution.SparkSqlSerializer2$$anonfun$createSerializationFunction$1.apply(SparkSqlSerializer2.scala:187)
at
org.apache.spark.sql.execution.Serializer2SerializationStream.writeKey(SparkSqlSerializer2.scala:65)
at
org.apache.spark.util.collection.PartitionedSerializedPairBuffer.insert(PartitionedSerializedPairBuffer.scala:74)
at
org.apache.spark.util.collection.ExternalSorter.insertAll(ExternalSorter.scala:219)
at
org.apache.spark.shuffle.sort.SortShuffleWriter.write(SortShuffleWriter.scala:62)
at
org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:70)
at
org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:41)
at org.apache.spark.scheduler.Task.run(Task.scala:70)
at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:213)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
```
@sryza Is there any particular reason that `write(b: Int)` is not supported
in `ChainedBufferOutputStream`? Or, we just have not implemented it?
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