Exception when closing output is ignored

sershe_20150522112029_d0863b33-8d2f-4b4c-b013-9ef70a2bc586:1_Map 1_8_0)] WARN org.apache.tez.runtime.LogicalIOProcessorRuntimeTask: Ignoring exception when closing output Reducer 2(cleanup). Exception class=java.lang.NullPointerException, message=null
java.lang.NullPointerException
        at org.apache.hadoop.fs.FileSystem.checkPath(FileSystem.java:618)
        at org.apache.hadoop.fs.RawLocalFileSystem.pathToFile(RawLocalFileSystem.java:81)
        at org.apache.hadoop.fs.RawLocalFileSystem.deprecatedGetFileStatus(RawLocalFileSystem.java:613)
        at org.apache.hadoop.fs.RawLocalFileSystem.getFileLinkStatusInternal(RawLocalFileSystem.java:831)
        at org.apache.hadoop.fs.RawLocalFileSystem.getFileStatus(RawLocalFileSystem.java:608)
        at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1425)
        at org.apache.hadoop.fs.RawLocalFileSystem.open(RawLocalFileSystem.java:198)
        at org.apache.hadoop.fs.FileSystem.open(FileSystem.java:768)
        at org.apache.tez.runtime.library.common.sort.impl.TezSpillRecord.<init>(TezSpillRecord.java:64)
        at org.apache.tez.runtime.library.common.sort.impl.TezSpillRecord.<init>(TezSpillRecord.java:56)
        at org.apache.tez.runtime.library.common.sort.impl.TezSpillRecord.<init>(TezSpillRecord.java:51)
        at org.apache.tez.runtime.library.output.OrderedPartitionedKVOutput.generateEvents(OrderedPartitionedKVOutput.java:209)
        at org.apache.tez.runtime.library.output.OrderedPartitionedKVOutput.close(OrderedPartitionedKVOutput.java:186)
        at org.apache.tez.runtime.LogicalIOProcessorRuntimeTask.cleanup(LogicalIOProcessorRuntimeTask.java:849)
        at org.apache.tez.runtime.task.TaskRunner2Callable.callInternal(TaskRunner2Callable.java:104)
        at org.apache.tez.runtime.task.TaskRunner2Callable.callInternal(TaskRunner2Callable.java:35)
        at org.apache.tez.common.CallableWithNdc.call(CallableWithNdc.java:36)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)