Fix ShuffleHandler tests

Error Message
Server returned HTTP response code: 500 for URL: http://127.0.0.1:13562/mapOutput?job=job_1111111111111_0001&reduce=0&map=attempt_1111111111111_0001_m_000001_0
Stacktrace
java.io.IOException: Server returned HTTP response code: 500 for URL: http://127.0.0.1:13562/mapOutput?job=job_1111111111111_0001&reduce=0&map=attempt_1111111111111_0001_m_000001_0
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1902)
	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1500)
	at org.apache.hadoop.mapred.TestShuffleHandler.testMapFileAccess(TestShuffleHandler.java:292)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:299)
	at org.junit.internal.runners.statements.FailOnTimeout$CallableStatement.call(FailOnTimeout.java:293)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.lang.Thread.run(Thread.java:750)
Standard Output
12:04:17.466 [Time-limited test] DEBUG o.a.h.m.lib.MutableMetricsFactory - field org.apache.hadoop.metrics2.lib.MutableGaugeInt org.apache.hadoop.mapred.ShuffleHandler$ShuffleMetrics.shuffleConnections with annotation @org.apache.hadoop.metrics2.annotation.Metric(always=false, sampleName=Ops, valueName=Time, about=, interval=10, type=DEFAULT, value=[# of current shuffle connections])
12:04:17.466 [Time-limited test] DEBUG o.a.h.m.lib.MutableMetricsFactory - field org.apache.hadoop.metrics2.lib.MutableCounterLong org.apache.hadoop.mapred.ShuffleHandler$ShuffleMetrics.shuffleOutputBytes with annotation @org.apache.hadoop.metrics2.annotation.Metric(always=false, sampleName=Ops, valueName=Time, about=, interval=10, type=DEFAULT, value=[Shuffle output in bytes])
12:04:17.466 [Time-limited test] DEBUG o.a.h.m.lib.MutableMetricsFactory - field org.apache.hadoop.metrics2.lib.MutableCounterInt org.apache.hadoop.mapred.ShuffleHandler$ShuffleMetrics.shuffleOutputsFailed with annotation @org.apache.hadoop.metrics2.annotation.Metric(always=false, sampleName=Ops, valueName=Time, about=, interval=10, type=DEFAULT, value=[# of failed shuffle outputs])
12:04:17.466 [Time-limited test] DEBUG o.a.h.m.lib.MutableMetricsFactory - field org.apache.hadoop.metrics2.lib.MutableCounterInt org.apache.hadoop.mapred.ShuffleHandler$ShuffleMetrics.shuffleOutputsOK with annotation @org.apache.hadoop.metrics2.annotation.Metric(always=false, sampleName=Ops, valueName=Time, about=, interval=10, type=DEFAULT, value=[# of succeeeded shuffle outputs])
12:04:17.466 [Time-limited test] DEBUG o.a.h.m.impl.MetricsSystemImpl - ShuffleMetrics, Shuffle output metrics
12:04:17.467 [Time-limited test] DEBUG o.a.hadoop.service.AbstractService - Service: mapreduce_shuffle entered state INITED
12:04:17.477 [Time-limited test] DEBUG o.a.hadoop.service.AbstractService - Config has been overridden during init
12:04:17.478 [Time-limited test] INFO  org.apache.hadoop.mapred.IndexCache - IndexCache created with max memory = 10485760
12:04:17.479 [Time-limited test] DEBUG o.a.h.m.lib.MutableMetricsFactory - field org.apache.hadoop.metrics2.lib.MutableGaugeInt org.apache.hadoop.mapred.ShuffleHandler$ShuffleMetrics.shuffleConnections with annotation @org.apache.hadoop.metrics2.annotation.Metric(always=false, sampleName=Ops, valueName=Time, about=, interval=10, type=DEFAULT, value=[# of current shuffle connections])
12:04:17.479 [Time-limited test] DEBUG o.a.h.m.lib.MutableMetricsFactory - field org.apache.hadoop.metrics2.lib.MutableCounterLong org.apache.hadoop.mapred.ShuffleHandler$ShuffleMetrics.shuffleOutputBytes with annotation @org.apache.hadoop.metrics2.annotation.Metric(always=false, sampleName=Ops, valueName=Time, about=, interval=10, type=DEFAULT, value=[Shuffle output in bytes])
12:04:17.479 [Time-limited test] DEBUG o.a.h.m.lib.MutableMetricsFactory - field org.apache.hadoop.metrics2.lib.MutableCounterInt org.apache.hadoop.mapred.ShuffleHandler$ShuffleMetrics.shuffleOutputsFailed with annotation @org.apache.hadoop.metrics2.annotation.Metric(always=false, sampleName=Ops, valueName=Time, about=, interval=10, type=DEFAULT, value=[# of failed shuffle outputs])
12:04:17.479 [Time-limited test] DEBUG o.a.h.m.lib.MutableMetricsFactory - field org.apache.hadoop.metrics2.lib.MutableCounterInt org.apache.hadoop.mapred.ShuffleHandler$ShuffleMetrics.shuffleOutputsOK with annotation @org.apache.hadoop.metrics2.annotation.Metric(always=false, sampleName=Ops, valueName=Time, about=, interval=10, type=DEFAULT, value=[# of succeeeded shuffle outputs])
12:04:17.479 [Time-limited test] DEBUG o.a.h.m.impl.MetricsSystemImpl - ShuffleMetrics, Shuffle output metrics
12:04:17.482 [Time-limited test] INFO  o.a.hadoop.mapred.ShuffleHandler - mapreduce_shuffle listening on port 13562
12:04:17.482 [Time-limited test] DEBUG o.a.hadoop.service.AbstractService - Service mapreduce_shuffle is started
12:04:17.483 [Time-limited test] INFO  o.a.hadoop.mapred.ShuffleHandler - Added token for job_1111111111111_0001
12:04:17.486 [ShuffleHandler Netty Worker #0] DEBUG o.a.hadoop.mapred.ShuffleHandler - ShuffleChannelInitializer init; channel='a9df992f'
12:04:17.487 [ShuffleHandler Netty Worker #0] DEBUG o.a.hadoop.mapred.ShuffleHandler - Executing channelActive; channel='a9df992f'
12:04:17.487 [ShuffleHandler Netty Worker #0] DEBUG o.a.hadoop.mapred.ShuffleHandler - Added channel: [id: 0xa9df992f, L:/127.0.0.1:13562 - R:/127.0.0.1:53014], channel id: a9df992f. Accepted number of connections=1
12:04:17.489 [ShuffleHandler Netty Worker #0] DEBUG o.a.hadoop.mapred.ShuffleHandler - Received HTTP request: HttpObjectAggregator$AggregatedFullHttpRequest(decodeResult: success, version: HTTP/1.1, content: CompositeByteBuf(ridx: 0, widx: 0, cap: 0, components=0))
GET /mapOutput?job=job_1111111111111_0001&reduce=0&map=attempt_1111111111111_0001_m_000001_0 HTTP/1.1
name: mapreduce
version: 1.0.0
UrlHash: +OVYyZ3+ni316LsqZvZcFqgV/H8=
User-Agent: Java/1.8.0_352
Host: 127.0.0.1:13562
Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
Connection: keep-alive
content-length: 0, channel='a9df992f'
12:04:17.489 [ShuffleHandler Netty Worker #0] DEBUG o.a.hadoop.mapred.ShuffleHandler - Received from request header: ShuffleVersion=1.0.0 header name=mapreduce, channel id: a9df992f
12:04:17.489 [ShuffleHandler Netty Worker #0] DEBUG o.a.hadoop.mapred.ShuffleHandler - RECV: /mapOutput?job=job_1111111111111_0001&reduce=0&map=attempt_1111111111111_0001_m_000001_0
  mapId: [attempt_1111111111111_0001_m_000001_0]
  reduceId: [0]
  jobId: [job_1111111111111_0001]
  keepAlive: false
  channel id: a9df992f
12:04:17.489 [ShuffleHandler Netty Worker #0] DEBUG o.a.hadoop.mapred.ShuffleHandler - Verifying request. encryptedURL:13562/mapOutput?job=job_1111111111111_0001&reduce=0&map=attempt_1111111111111_0001_m_000001_0, hash:sqZvZcFqgV/H8, channel id: a9df992f
12:04:17.490 [ShuffleHandler Netty Worker #0] DEBUG o.a.hadoop.mapred.ShuffleHandler - Fetcher request verified. encryptedURL: 13562/mapOutput?job=job_1111111111111_0001&reduce=0&map=attempt_1111111111111_0001_m_000001_0, reply: ii/HLwQUsdwdA, channel id: a9df992f
12:04:17.491 [ShuffleHandler Netty Worker #0] DEBUG o.a.hadoop.mapred.ShuffleHandler - Retrieved pathInfo for AttemptPathIdentifier{attemptId='attempt_1111111111111_0001_m_000001_0', jobId='job_1111111111111_0001'} check for corresponding loaded messages to determine whether it was loaded or cached
12:04:17.491 [ShuffleHandler Netty Worker #0] DEBUG org.apache.hadoop.mapred.IndexCache - IndexCache MISS: MapId attempt_1111111111111_0001_m_000001_0 not found
12:04:17.492 [ShuffleHandler Netty Worker #0] DEBUG o.a.h.f.s.i.IOStatisticsContextIntegration - Created instance IOStatisticsContextImpl{id=5, threadId=136, ioStatistics=counters=();
gauges=();
minimums=();
maximums=();
means=();
}
12:04:17.493 [ShuffleHandler Netty Worker #0] DEBUG o.apache.hadoop.io.nativeio.NativeIO - Got UserName jenkins for ID 910 from the native implementation
12:04:17.494 [ShuffleHandler Netty Worker #0] DEBUG o.apache.hadoop.io.nativeio.NativeIO - Got GroupName jenkins for ID 910 from the native implementation
12:04:17.498 [ShuffleHandler Netty Worker #0] ERROR o.a.hadoop.mapred.ShuffleHandler - Shuffle error while populating headers. Channel id: a9df992f
java.io.IOException: Error Reading IndexFile
	at org.apache.hadoop.mapred.IndexCache.readIndexFileToCache(IndexCache.java:123) ~[hadoop-mapreduce-client-core-3.4.0-SNAPSHOT.jar:na]
	at org.apache.hadoop.mapred.IndexCache.getIndexInformation(IndexCache.java:68) ~[hadoop-mapreduce-client-core-3.4.0-SNAPSHOT.jar:na]
	at org.apache.hadoop.mapred.ShuffleChannelHandler.getMapOutputInfo(ShuffleChannelHandler.java:360) [classes/:na]
	at org.apache.hadoop.mapred.ShuffleChannelHandler.populateHeaders(ShuffleChannelHandler.java:381) [classes/:na]
	at org.apache.hadoop.mapred.ShuffleChannelHandler.channelRead0(ShuffleChannelHandler.java:275) [classes/:na]
	at org.apache.hadoop.mapred.ShuffleChannelHandler.channelRead0(ShuffleChannelHandler.java:130) [classes/:na]
	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:99) [netty-transport-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-transport-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-transport-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [netty-transport-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:103) [netty-codec-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-transport-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-transport-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [netty-transport-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:436) [netty-transport-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:327) [netty-codec-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:299) [netty-codec-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:251) [netty-transport-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-transport-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-transport-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [netty-transport-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) [netty-transport-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-transport-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-transport-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) [netty-transport-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166) [netty-transport-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:722) [netty-transport-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:658) [netty-transport-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:584) [netty-transport-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:496) [netty-transport-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:995) [netty-common-4.1.77.Final.jar:4.1.77.Final]
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-common-4.1.77.Final.jar:4.1.77.Final]
	at java.lang.Thread.run(Thread.java:750) [na:1.8.0_352]
Caused by: java.io.IOException: Owner 'jenkins' for path /tmp/test-shuffle-channel-handler1169959588626711767/job_1111111111111_0001/testUser/attempt_1111111111111_0001_m_000001_0/index did not match expected owner 'testUser'
	at org.apache.hadoop.io.SecureIOUtils.checkStat(SecureIOUtils.java:299) ~[hadoop-common-3.4.0-SNAPSHOT.jar:na]
	at org.apache.hadoop.io.SecureIOUtils.forceSecureOpenFSDataInputStream(SecureIOUtils.java:183) ~[hadoop-common-3.4.0-SNAPSHOT.jar:na]
	at org.apache.hadoop.io.SecureIOUtils.openFSDataInputStream(SecureIOUtils.java:161) ~[hadoop-common-3.4.0-SNAPSHOT.jar:na]
	at org.apache.hadoop.mapred.SpillRecord.<init>(SpillRecord.java:71) ~[hadoop-mapreduce-client-core-3.4.0-SNAPSHOT.jar:na]
	at org.apache.hadoop.mapred.SpillRecord.<init>(SpillRecord.java:62) ~[hadoop-mapreduce-client-core-3.4.0-SNAPSHOT.jar:na]
	at org.apache.hadoop.mapred.IndexCache.readIndexFileToCache(IndexCache.java:119) ~[hadoop-mapreduce-client-core-3.4.0-SNAPSHOT.jar:na]
	... 32 common frames omitted
12:04:17.502 [Time-limited test] DEBUG o.a.hadoop.service.AbstractService - Service: mapreduce_shuffle entered state STOPPED
12:04:17.503 [ShuffleHandler Netty Worker #0] DEBUG o.a.hadoop.mapred.ShuffleHandler - Executing channelInactive; channel='a9df992f'
12:04:17.503 [ShuffleHandler Netty Worker #0] DEBUG o.a.hadoop.mapred.ShuffleHandler - New value of Accepted number of connections=0