Major Description
tez 使用snappy压缩方式时，会报错缓冲区太小：
java.io.IOException: java.lang.InternalError: Could not decompress data. Buffer length is too small.java.io.IOException: java.lang.InternalError: Could not decompress data. Buffer length is too small. at org.apache.tez.runtime.library.common.shuffle.ShuffleUtils.shuffleToMemory(ShuffleUtils.java:137) at org.apache.tez.runtime.library.common.shuffle.orderedgrouped.FetcherOrderedGrouped.copyMapOutput(FetcherOrderedGrouped.java:550) at org.apache.tez.runtime.library.common.shuffle.orderedgrouped.FetcherOrderedGrouped.copyFromHost(FetcherOrderedGrouped.java:283) at org.apache.tez.runtime.library.common.shuffle.orderedgrouped.FetcherOrderedGrouped.fetchNext(FetcherOrderedGrouped.java:182) at org.apache.tez.runtime.library.common.shuffle.orderedgrouped.FetcherOrderedGrouped.callInternal(FetcherOrderedGrouped.java:194) at org.apache.tez.runtime.library.common.shuffle.orderedgrouped.FetcherOrderedGrouped.callInternal(FetcherOrderedGrouped.java:57) at org.apache.tez.common.CallableWithNdc.call(CallableWithNdc.java:36) at com.google.common.util.concurrent.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.runInterruptibly(TrustedListenableFutureTask.java:111) at com.google.common.util.concurrent.InterruptibleTask.run(InterruptibleTask.java:58) at com.google.common.util.concurrent.TrustedListenableFutureTask.run(TrustedListenableFutureTask.java:75) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748)Caused by: java.lang.InternalError: Could not decompress data. Buffer length is too small. at org.apache.hadoop.io.compress.snappy.SnappyDecompressor.decompressBytesDirect(Native Method) at org.apache.hadoop.io.compress.snappy.SnappyDecompressor.decompress(SnappyDecompressor.java:238) at org.apache.hadoop.io.compress.BlockDecompressorStream.decompress(BlockDecompressorStream.java:88) at org.apache.hadoop.io.compress.DecompressorStream.read(DecompressorStream.java:105) at org.apache.hadoop.io.IOUtils.readFully(IOUtils.java:210) at org.apache.tez.runtime.library.common.sort.impl.IFile$Reader.readToMemory(IFile.java:833) at org.apache.tez.runtime.library.common.shuffle.ShuffleUtils.shuffleToMemory(ShuffleUtils.java:121) ... 12 more
