我有一些问题与自定义类在图形。我做了一个顶点输入和输出格式，但我总是得到以下错误:
java.io.IOException: ensureRemaining: Only * bytes remaining, trying to read *
中"*"的位置不同。
在单节点集群上进行了测试。
当vertexIterator执行next()时，如果没有剩余的顶点，就会发生这个问题。这个迭代器是从flush方法调用的，但我不明白，基本上，为什么"next()"方法失败了。这里有一些日志和类…
我的日志如下:
15/09/08 00:52:21 INFO bsp.BspService: BspService: Connecting to ZooKeeper with job giraph_yarn_application_1441683854213_0001, 1 on localhost:22181
15/09/08 00:52:21 INFO zookeeper.ZooKeeper: Client environment:zookeeper.version=3.4.5-1392090, built on 09/30/2012 17:52 GMT
15/09/08 00:52:21 INFO zookeeper.ZooKeeper: Client environment:host.name=localhost
15/09/08 00:52:21 INFO zookeeper.ZooKeeper: Client environment:java.version=1.7.0_79
15/09/08 00:52:21 INFO zookeeper.ZooKeeper: Client environment:java.vendor=Oracle Corporation
15/09/08 00:52:21 INFO zookeeper.ZooKeeper: Client environment:java.home=/usr/lib/jvm/java-7-openjdk-amd64/jre
15/09/08 00:52:21 INFO zookeeper.ZooKeeper: Client environment:java.class.path=.:${CLASSPATH}:./**/
15/09/08 00:52:21 INFO zookeeper.ZooKeeper: Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni:/lib:/usr/l$
15/09/08 00:52:21 INFO zookeeper.ZooKeeper: Client environment:java.io.tmpdir=/tmp
15/09/08 00:52:21 INFO zookeeper.ZooKeeper: Client environment:java.compiler=<NA>
15/09/08 00:52:21 INFO zookeeper.ZooKeeper: Client environment:os.name=Linux
15/09/08 00:52:21 INFO zookeeper.ZooKeeper: Client environment:os.arch=amd64
15/09/08 00:52:21 INFO zookeeper.ZooKeeper: Client environment:os.version=3.13.0-62-generic
15/09/08 00:52:21 INFO zookeeper.ZooKeeper: Client environment:user.name=hduser
15/09/08 00:52:21 INFO zookeeper.ZooKeeper: Client environment:user.home=/home/hduser
15/09/08 00:52:21 INFO zookeeper.ZooKeeper: Client environment:user.dir=/app/hadoop/tmp/nm-local-dir/usercache/hduser/appcache/application_1441683854213_0001/container_1441683854213_0001_01_000003
15/09/08 00:52:21 INFO zookeeper.ZooKeeper: Initiating client connection, connectString=localhost:22181 sessionTimeout=60000 watcher=org.apache.giraph.worker.BspServiceWorker@4256d3a0
15/09/08 00:52:21 INFO zookeeper.ClientCnxn: Opening socket connection to server localhost/127.0.0.1:22181. Will not attempt to authenticate using SASL (unknown error)
15/09/08 00:52:21 INFO zookeeper.ClientCnxn: Socket connection established to localhost/127.0.0.1:22181, initiating session
15/09/08 00:52:21 INFO zookeeper.ClientCnxn: Session establishment complete on server localhost/127.0.0.1:22181, sessionid = 0x14fab0de0bb0002, negotiated timeout = 40000
15/09/08 00:52:21 INFO bsp.BspService: process: Asynchronous connection complete.
15/09/08 00:52:21 INFO netty.NettyServer: NettyServer: Using execution group with 8 threads for requestFrameDecoder.
15/09/08 00:52:21 INFO Configuration.deprecation: mapred.map.tasks is deprecated. Instead, use mapreduce.job.maps
15/09/08 00:52:21 INFO netty.NettyServer: start: Started server communication server: localhost/127.0.0.1:30001 with up to 16 threads on bind attempt 0 with sendBufferSize = 32768 receiveBufferSize = 524288
15/09/08 00:52:21 INFO netty.NettyClient: NettyClient: Using execution handler with 8 threads after request-encoder.
15/09/08 00:52:21 INFO graph.GraphTaskManager: setup: Registering health of this worker...
15/09/08 00:52:21 INFO yarn.GiraphYarnTask: [STATUS: task-1] WORKER_ONLY starting...
15/09/08 00:52:22 INFO bsp.BspService: getJobState: Job state already exists (/_hadoopBsp/giraph_yarn_application_1441683854213_0001/_masterJobState)
15/09/08 00:52:22 INFO bsp.BspService: getApplicationAttempt: Node /_hadoopBsp/giraph_yarn_application_1441683854213_0001/_applicationAttemptsDir already exists!
15/09/08 00:52:22 INFO bsp.BspService: getApplicationAttempt: Node /_hadoopBsp/giraph_yarn_application_1441683854213_0001/_applicationAttemptsDir already exists!
15/09/08 00:52:22 INFO worker.BspServiceWorker: registerHealth: Created my health node for attempt=0, superstep=-1 with /_hadoopBsp/giraph_yarn_application_1441683854213_0001/_applicationAttemptsDir/0/_superstepD$
15/09/08 00:52:22 INFO netty.NettyServer: start: Using Netty without authentication.
15/09/08 00:52:22 INFO bsp.BspService: process: partitionAssignmentsReadyChanged (partitions are assigned)
15/09/08 00:52:22 INFO worker.BspServiceWorker: startSuperstep: Master(hostname=localhost, MRtaskID=0, port=30000)
15/09/08 00:52:22 INFO worker.BspServiceWorker: startSuperstep: Ready for computation on superstep -1 since worker selection and vertex range assignments are done in /_hadoopBsp/giraph_yarn_application_1441683854$
15/09/08 00:52:22 INFO yarn.GiraphYarnTask: [STATUS: task-1] startSuperstep: WORKER_ONLY - Attempt=0, Superstep=-1
15/09/08 00:52:22 INFO netty.NettyClient: Using Netty without authentication.
15/09/08 00:52:22 INFO netty.NettyClient: Using Netty without authentication.
15/09/08 00:52:22 INFO netty.NettyClient: connectAllAddresses: Successfully added 2 connections, (2 total connected) 0 failed, 0 failures total.
15/09/08 00:52:22 INFO netty.NettyServer: start: Using Netty without authentication.
15/09/08 00:52:22 INFO handler.RequestDecoder: decode: Server window metrics MBytes/sec received = 0, MBytesReceived = 0.0001, ave received req MBytes = 0.0001, secs waited = 1.44168435E9
15/09/08 00:52:22 INFO worker.BspServiceWorker: loadInputSplits: Using 1 thread(s), originally 1 threads(s) for 1 total splits.
15/09/08 00:52:22 INFO worker.InputSplitsHandler: reserveInputSplit: Reserved input split path /_hadoopBsp/giraph_yarn_application_1441683854213_0001/_vertexInputSplitDir/0, overall roughly 0.0% input splits rese$
15/09/08 00:52:22 INFO worker.InputSplitsCallable: getInputSplit: Reserved /_hadoopBsp/giraph_yarn_application_1441683854213_0001/_vertexInputSplitDir/0 from ZooKeeper and got input split 'hdfs://hdnode01:54310/u$
15/09/08 00:52:22 INFO worker.InputSplitsCallable: loadFromInputSplit: Finished loading /_hadoopBsp/giraph_yarn_application_1441683854213_0001/_vertexInputSplitDir/0 (v=6, e=10)
15/09/08 00:52:22 INFO worker.InputSplitsCallable: call: Loaded 1 input splits in 0.16241108 secs, (v=6, e=10) 36.94329 vertices/sec, 61.572155 edges/sec
15/09/08 00:52:22 ERROR utils.LogStacktraceCallable: Execution of callable failed
java.lang.IllegalStateException: next: IOException
at org.apache.giraph.utils.VertexIterator.next(VertexIterator.java:101)
at org.apache.giraph.partition.BasicPartition.addPartitionVertices(BasicPartition.java:99)
at org.apache.giraph.comm.requests.SendWorkerVerticesRequest.doRequest(SendWorkerVerticesRequest.java:115)
at org.apache.giraph.comm.netty.NettyWorkerClientRequestProcessor.doRequest(NettyWorkerClientRequestProcessor.java:466)
at org.apache.giraph.comm.netty.NettyWorkerClientRequestProcessor.flush(NettyWorkerClientRequestProcessor.java:412)
at org.apache.giraph.worker.InputSplitsCallable.call(InputSplitsCallable.java:241)
at org.apache.giraph.worker.InputSplitsCallable.call(InputSplitsCallable.java:60)
at org.apache.giraph.utils.LogStacktraceCallable.call(LogStacktraceCallable.java:51)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.IOException: ensureRemaining: Only 0 bytes remaining, trying to read 1
at org.apache.giraph.utils.UnsafeReads.ensureRemaining(UnsafeReads.java:77)
at org.apache.giraph.utils.UnsafeArrayReads.readByte(UnsafeArrayReads.java:123)
at org.apache.giraph.utils.UnsafeReads.readLine(UnsafeReads.java:100)
at pruebas.TextAndDoubleComplexWritable.readFields(TextAndDoubleComplexWritable.java:37)
at org.apache.giraph.utils.WritableUtils.reinitializeVertexFromDataInput(WritableUtils.java:540)
at org.apache.giraph.utils.VertexIterator.next(VertexIterator.java:98)
... 11 more
15/09/08 00:52:22 ERROR worker.BspServiceWorker: unregisterHealth: Got failure, unregistering health on /_hadoopBsp/giraph_yarn_application_1441683854213_0001/_applicationAttemptsDir/0/_superstepDir/-1/_workerHea$
15/09/08 00:52:22 ERROR yarn.GiraphYarnTask: GiraphYarnTask threw a top-level exception, failing task
java.lang.RuntimeException: run: Caught an unrecoverable exception waitFor: ExecutionException occurred while waiting for org.apache.giraph.utils.ProgressableUtils$FutureWaitable@4bbf48f0
at org.apache.giraph.yarn.GiraphYarnTask.run(GiraphYarnTask.java:104)
at org.apache.giraph.yarn.GiraphYarnTask.main(GiraphYarnTask.java:183)
Caused by: java.lang.IllegalStateException: waitFor: ExecutionException occurred while waiting for org.apache.giraph.utils.ProgressableUtils$FutureWaitable@4bbf48f0
at org.apache.giraph.utils.ProgressableUtils.waitFor(ProgressableUtils.java:193)
at org.apache.giraph.utils.ProgressableUtils.waitForever(ProgressableUtils.java:151)
at org.apache.giraph.utils.ProgressableUtils.waitForever(ProgressableUtils.java:136)
at org.apache.giraph.utils.ProgressableUtils.getFutureResult(ProgressableUtils.java:99)
at org.apache.giraph.utils.ProgressableUtils.getResultsWithNCallables(ProgressableUtils.java:233)
at org.apache.giraph.worker.BspServiceWorker.loadInputSplits(BspServiceWorker.java:316)
at org.apache.giraph.worker.BspServiceWorker.loadVertices(BspServiceWorker.java:409)
at org.apache.giraph.worker.BspServiceWorker.setup(BspServiceWorker.java:629)
at org.apache.giraph.graph.GraphTaskManager.execute(GraphTaskManager.java:284)
at org.apache.giraph.yarn.GiraphYarnTask.run(GiraphYarnTask.java:92)
... 1 more
Caused by: java.util.concurrent.ExecutionException: java.lang.IllegalStateException: next: IOException
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:202)
at org.apache.giraph.utils.ProgressableUtils$FutureWaitable.waitFor(ProgressableUtils.java:312)
at org.apache.giraph.utils.ProgressableUtils.waitFor(ProgressableUtils.java:185)
... 10 more
Caused by: java.lang.IllegalStateException: next: IOException
at org.apache.giraph.utils.VertexIterator.next(VertexIterator.java:101)
at org.apache.giraph.partition.BasicPartition.addPartitionVertices(BasicPartition.java:99)
at org.apache.giraph.comm.requests.SendWorkerVerticesRequest.doRequest(SendWorkerVerticesRequest.java:115)
at org.apache.giraph.comm.netty.NettyWorkerClientRequestProcessor.doRequest(NettyWorkerClientRequestProcessor.java:466)
at org.apache.giraph.comm.netty.NettyWorkerClientRequestProcessor.flush(NettyWorkerClientRequestProcessor.java:412)
at org.apache.giraph.worker.InputSplitsCallable.call(InputSplitsCallable.java:241)
at org.apache.giraph.worker.InputSplitsCallable.call(InputSplitsCallable.java:60)
at org.apache.giraph.utils.LogStacktraceCallable.call(LogStacktraceCallable.java:51)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.IOException: ensureRemaining: Only 0 bytes remaining, trying to read 1
at org.apache.giraph.utils.UnsafeReads.ensureRemaining(UnsafeReads.java:77)
at org.apache.giraph.utils.UnsafeArrayReads.readByte(UnsafeArrayReads.java:123)
at org.apache.giraph.utils.UnsafeReads.readLine(UnsafeReads.java:100)
at pruebas.TextAndDoubleComplexWritable.readFields(TextAndDoubleComplexWritable.java:37)
at org.apache.giraph.utils.WritableUtils.reinitializeVertexFromDataInput(WritableUtils.java:540)
at org.apache.giraph.utils.VertexIterator.next(VertexIterator.java:98)
... 11 more
My Input format:
package pruebas;
import org.apache.giraph.edge.Edge;
import org.apache.giraph.edge.EdgeFactory;
import org.apache.giraph.io.formats.AdjacencyListTextVertexInputFormat;
import org.apache.hadoop.io.DoubleWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
/**
* @author hduser
*
*/
public class IdTextWithComplexValueInputFormat
extends
AdjacencyListTextVertexInputFormat<Text, TextAndDoubleComplexWritable, DoubleWritable> {
@Override
public AdjacencyListTextVertexReader createVertexReader(InputSplit split,
TaskAttemptContext context) {
return new TextComplexValueDoubleAdjacencyListVertexReader();
}
protected class TextComplexValueDoubleAdjacencyListVertexReader extends
AdjacencyListTextVertexReader {
/**
* Constructor with
* {@link AdjacencyListTextVertexInputFormat.LineSanitizer}.
*
* @param lineSanitizer
* the sanitizer to use for reading
*/
public TextComplexValueDoubleAdjacencyListVertexReader() {
super();
}
@Override
public Text decodeId(String s) {
return new Text(s);
}
@Override
public TextAndDoubleComplexWritable decodeValue(String s) {
TextAndDoubleComplexWritable valorComplejo = new TextAndDoubleComplexWritable();
valorComplejo.setVertexData(Double.valueOf(s));
valorComplejo.setIds_vertices_anteriores("");
return valorComplejo;
}
@Override
public Edge<Text, DoubleWritable> decodeEdge(String s1, String s2) {
return EdgeFactory.create(new Text(s1),
new DoubleWritable(Double.valueOf(s2)));
}
}
}
TextAndDoubleComplexWritable:
package pruebas;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import org.apache.hadoop.io.Writable;
public class TextAndDoubleComplexWritable implements Writable {
private String idsVerticesAnteriores;
private double vertexData;
public TextAndDoubleComplexWritable() {
super();
this.idsVerticesAnteriores = "";
}
public TextAndDoubleComplexWritable(double vertexData) {
super();
this.vertexData = vertexData;
}
public TextAndDoubleComplexWritable(String ids_vertices_anteriores,
double vertexData) {
super();
this.idsVerticesAnteriores = ids_vertices_anteriores;
this.vertexData = vertexData;
}
public void write(DataOutput out) throws IOException {
out.writeUTF(idsVerticesAnteriores);
}
public void readFields(DataInput in) throws IOException {
idsVerticesAnteriores = in.readLine();
}
public String getIds_vertices_anteriores() {
return idsVerticesAnteriores;
}
public void setIds_vertices_anteriores(String ids_vertices_anteriores) {
this.idsVerticesAnteriores = ids_vertices_anteriores;
}
public double getVertexData() {
return vertexData;
}
public void setVertexData(double vertexData) {
this.vertexData = vertexData;
}
}
我的输入文件:
Portada 0.0 Sugerencias 1.0
Sugerencias 3.0 Portada 1.0
，我用下面的命令执行它:
$HADOOP_HOME/bin/yarn jar $GIRAPH_HOME/giraph-examples/target/giraph-examples-1.1.0-for-hadoop-2.4.0-jar-with-dependencies.jar org.apache.giraph.GiraphRunner lectura_de_grafo.BusquedaDeCaminosNavegacionalesWikiquote -vif pruebas.IdTextWithComplexValueInputFormat -vip /user/hduser/input/wiki-graph-chiquito.txt -op /user/hduser/output/caminosNavegacionales -w 2 -yh 250
任何帮助将不胜感激!
更新:我的输入文件错误。Giraph(或我的例子)处理得不是很好输出到未列出的顶点。
但是问题还是发生了。我更新了我原来问题的文件数据。
更新2:没有使用OutputFormat，也不会执行用于计算的算法。我删除这两个有助于澄清问题。
更新3,19/11/2015:问题不在于输入格式，输入格式工作得很好，可以完全读取数据。问题是在类TextAndDoubleComplexWritable，我把它添加到我原来的问题，为了更好地解释这个最终解决方案(我也添加了一个答案)。
下面是org.apache.giraph.utils.UnsafeReads.ensureRemaining异常的根本原因。注意，这是由图形utils调用的。
异常意味着阅读器坚持需要从输入流中获得更多的输入，但是输入流没有那么多的输入剩余(即它到达EOF)。
只是在黑暗中拍摄，但您是否尝试检查next()是否返回null。读到最后的时候?
if(method == null){
//Continue
}
else{
//It's Null
}
问题在TextAndDoubleComplexWritable类中。在实现Writable接口时，我没有意识到readFields和write方法的重要性。这是至关重要的，因为这些方法让我们在图形中发送和接收信息。我在readFields方法中写了一个空字符串，我应该使用该方法来写顶点的两个值。我以以下方式更新了这两个方法:
public void write(DataOutput out) throws IOException {
out.writeDouble(this.vertexData);
out.writeUTF(this.idsVerticesAnteriores != "" ? "hola"
: this.idsVerticesAnteriores);
}
public void readFields(DataInput in) throws IOException {
this.vertexData = in.readDouble();
this.idsVerticesAnteriores = in.readUTF();
// idsVerticesAnteriores = in.readLine();
}
这是工作，终于!!