我试图在Hadoop 2.5.2上使用Giraph 1.1运行基本的ShortestPaths示例。我在实际的集群模型中运行（例如，不是伪分布式的），我可以运行标准的mapreduce作业。但是当我尝试运行Giraph示例时，它似乎挂起，除非我设置
-ca giraph.SplitMasterWorker=false
并相应地将工人数量设置为1.但是这有点打败群集上的运行点，不是吗？ OTOH，如果我在没有禁用SplitMasterWorker的情况下运行，我会收到此错误：
When using LocalJobRunner, you cannot run in split master / worker mode
since there is only 1 task at a time!
这表明Girpah默认为本地模式。我读过的一份报告建议通过添加
来解决这个问题-ca mapred.job.tracker = 10.0.0.12：5431
到Girpah命令行，但在带有YARN的Hadoop 2.5.2上，如果我理解正确的话，端口5431上没有JobTracker。无论如何，如果我确实添加了这一点，那么尝试的作业就会运行，但似乎没有完成就会挂起。这是完整的命令行，作业输出如下：
[prhodes@ip-10-0-0-12 conf]$ hadoop jar /home/prhodes/giraph/giraph-
examples/target/giraph-examples-1.2.0-SNAPSHOT-for-hadoop-2.5.2-jar-with-
dependencies.jar org.apache.giraph.GiraphRunner
org.apache.giraph.examples.SimpleShortestPathsComputation -vif
org.apache.giraph.io.formats.JsonLongDoubleFloatDoubleVertexInputFormat
-vip /user/prhodes/input/tiny_graph.txt -vof
org.apache.giraph.io.formats.IdWithValueTextOutputFormat -op
/user/prhodes/giraph_output/shortestpaths -w 3 -ca
mapred.job.tracker=10.0.0.12:5431
15/03/10 03:18:59 INFO utils.ConfigurationUtils: No edge input format specified. Ensure your InputFormat does not require one.
15/03/10 03:19:02 INFO server.NIOServerCnxnFactory: binding to port 0.0.0.0/0.0.0.0:22181
15/03/10 03:19:02 INFO server.PrepRequestProcessor: zookeeper.skipACL=="yes", ACL checks will be skipped
15/03/10 03:19:05 INFO zk.ZooKeeperManager: onlineZooKeeperServers: Connect attempt 1 of 10 max trying to connect to ip-10-0-0-12.ec2.internal:22181 with poll msecs = 3000
15/03/10 03:19:05 INFO zk.ZooKeeperManager: onlineZooKeeperServers: Connected to ip-10-0-0-12.ec2.internal/10.0.0.12:22181!
15/03/10 03:19:05 INFO zk.ZooKeeperManager: onlineZooKeeperServers: Creating my filestamp _bsp/_defaultZkManagerDir/job_local1346154675_0001/_zkServer/ip-10-0-0-12.ec2.internal 0
15/03/10 03:19:05 INFO server.NIOServerCnxnFactory: Accepted socket connection from /10.0.0.12:45182
15/03/10 03:19:05 INFO graph.GraphTaskManager: setup: Chosen to run ZooKeeper...
15/03/10 03:19:05 INFO graph.GraphTaskManager: setup: Starting up BspServiceMaster (master thread)...
15/03/10 03:19:05 INFO bsp.BspService: BspService: Path to create to halt is /_hadoopBsp/job_local1346154675_0001/_haltComputation
15/03/10 03:19:05 INFO bsp.BspService: BspService: Connecting to ZooKeeper with job job_local1346154675_0001, 0 on ip-10-0-0-12.ec2.internal:22181
15/03/10 03:19:05 INFO zookeeper.ClientCnxn: Opening socket connection to server ip-10-0-0-12.ec2.internal/10.0.0.12:22181. Will not attempt to authenticate using SASL (unknown error)
15/03/10 03:19:05 INFO server.NIOServerCnxnFactory: Accepted socket connection from /10.0.0.12:45183
15/03/10 03:19:05 INFO zookeeper.ClientCnxn: Socket connection established to ip-10-0-0-12.ec2.internal/10.0.0.12:22181, initiating session
15/03/10 03:19:05 INFO server.ZooKeeperServer: Client attempting to establish new session at /10.0.0.12:45183
15/03/10 03:19:05 INFO persistence.FileTxnLog: Creating new log file: log.1
15/03/10 03:19:05 INFO server.ZooKeeperServer: Established session 0x14c01b158f00000 with negotiated timeout 600000 for client /10.0.0.12:45183
15/03/10 03:19:05 INFO zookeeper.ClientCnxn: Session establishment complete on server ip-10-0-0-12.ec2.internal/10.0.0.12:22181, sessionid = 0x14c01b158f00000, negotiated timeout = 600000
15/03/10 03:19:05 INFO bsp.BspService: process: Asynchronous connection complete.
15/03/10 03:19:05 INFO graph.GraphTaskManager: map: No need to do anything when not a worker
15/03/10 03:19:05 INFO graph.GraphTaskManager: cleanup: Starting for MASTER_ZOOKEEPER_ONLY
15/03/10 03:19:05 INFO server.PrepRequestProcessor: Got user-level KeeperException when processing sessionid:0x14c01b158f00000 type:create cxid:0x1 zxid:0x2 txntype:-1 reqpath:n/a Error Path:/_hadoopBsp/job_local1346154675_0001/_masterElectionDir Error:KeeperErrorCode = NoNode for /_hadoopBsp/job_local1346154675_0001/_masterElectionDir
15/03/10 03:19:05 INFO master.BspServiceMaster: becomeMaster: First child is '/_hadoopBsp/job_local1346154675_0001/_masterElectionDir/ip-10-0-0-12.ec2.internal_00000000000' and my bid is '/_hadoopBsp/job_local1346154675_0001/_masterElectionDir/ip-10-0-0-12.ec2.internal_00000000000'
15/03/10 03:19:05 INFO netty.NettyServer: NettyServer: Using execution group with 8 threads for requestFrameDecoder.
15/03/10 03:19:05 INFO Configuration.deprecation: mapred.map.tasks is deprecated. Instead, use mapreduce.job.maps
15/03/10 03:19:05 INFO netty.NettyServer: start: Started server communication server: ip-10-0-0-12.ec2.internal/10.0.0.12:30000 with up to 16 threads on bind attempt 0 with sendBufferSize = 32768 receiveBufferSize = 524288
15/03/10 03:19:05 INFO netty.NettyClient: NettyClient: Using execution handler with 8 threads after request-encoder.
15/03/10 03:19:05 INFO master.BspServiceMaster: becomeMaster: I am now the master!
15/03/10 03:19:05 INFO server.PrepRequestProcessor: Got user-level KeeperException when processing sessionid:0x14c01b158f00000 type:create cxid:0xe zxid:0x9 txntype:-1 reqpath:n/a Error Path:/_hadoopBsp/job_local1346154675_0001/_applicationAttemptsDir/0 Error:KeeperErrorCode = NoNode for /_hadoopBsp/job_local1346154675_0001/_applicationAttemptsDir/0
15/03/10 03:19:05 INFO bsp.BspService: process: applicationAttemptChanged signaled
15/03/10 03:19:05 INFO server.PrepRequestProcessor: Got user-level KeeperException when processing sessionid:0x14c01b158f00000 type:create cxid:0x16 zxid:0xc txntype:-1 reqpath:n/a Error Path:/_hadoopBsp/job_local1346154675_0001/_applicationAttemptsDir/0/_superstepDir/-1 Error:KeeperErrorCode = NoNode for /_hadoopBsp/job_local1346154675_0001/_applicationAttemptsDir/0/_superstepDir/-1
15/03/10 03:19:05 WARN bsp.BspService: process: Unknown and unprocessed event (path=/_hadoopBsp/job_local1346154675_0001/_applicationAttemptsDir/0/_superstepDir, type=NodeChildrenChanged, state=SyncConnected)
15/03/10 03:19:07 INFO mapred.LocalJobRunner: MASTER_ZOOKEEPER_ONLY checkWorkers: Only found 0 responses of 3 needed to start superstep -1 > map
15/03/10 03:19:07 INFO job.HaltApplicationUtils$DefaultHaltInstructionsWriter: writeHaltInstructions: To halt after next superstep execute: 'bin/halt-application --zkServer ip-10-0-0-12.ec2.internal:22181 --zkNode /_hadoopBsp/job_local1346154675_0001/_haltComputation'
15/03/10 03:19:07 INFO mapreduce.Job: Running job: job_local1346154675_0001
15/03/10 03:19:08 INFO mapreduce.Job: Job job_local1346154675_0001 running in uber mode : false
15/03/10 03:19:08 INFO mapreduce.Job: map 25% reduce 0%
15/03/10 03:19:10 INFO mapred.LocalJobRunner: MASTER_ZOOKEEPER_ONLY checkWorkers: Only found 0 responses of 3 needed to start superstep -1 > map
15/03/10 03:19:19 INFO mapred.LocalJobRunner: MASTER_ZOOKEEPER_ONLY checkWorkers: Only found 0 responses of 3 needed to start superstep -1 > map
15/03/10 03:19:28 INFO mapred.LocalJobRunner: MASTER_ZOOKEEPER_ONLY checkWorkers: Only found 0 responses of 3 needed to start superstep -1 > map
15/03/10 03:19:35 INFO master.BspServiceMaster: checkWorkers: Only found 0 responses of 3 needed to start superstep -1. Reporting every 30000 msecs, 569976 more msecs left before giving up.
15/03/10 03:19:35 INFO server.PrepRequestProcessor: Got user-level KeeperException when processing sessionid:0x14c01b158f00000 type:create cxid:0x22 zxid:0x10 txntype:-1 reqpath:n/a Error Path:/_hadoopBsp/job_local1346154675_0001/_applicationAttemptsDir/0/_superstepDir/-1/_workerHealthyDir Error:KeeperErrorCode = NodeExists for /_hadoopBsp/job_local1346154675_0001/_applicationAttemptsDir/0/_superstepDir/-1/_workerHealthyDir
15/03/10 03:19:35 INFO server.PrepRequestProcessor: Got user-level KeeperException when processing sessionid:0x14c01b158f00000 type:create cxid:0x23 zxid:0x11 txntype:-1 reqpath:n/a Error Path:/_hadoopBsp/job_local1346154675_0001/_applicationAttemptsDir/0/_superstepDir/-1/_workerUnhealthyDir Error:KeeperErrorCode = NodeExists for /_hadoopBsp/job_local1346154675_0001/_applicationAttemptsDir/0/_superstepDir/-1/_workerUnhealthyDir
15/03/10 03:19:40 INFO mapred.LocalJobRunner: MASTER_ZOOKEEPER_ONLY checkWorkers: Only found 0 responses of 3 needed to start superstep -1 > map
答案 0 :(得分：0)
好的，事实证明这很简单。我使用hadoop_2配置文件构建了Giraph，而不是hadoop_yarn。当我使用纱线轮廓构建它时，不再发生这种情况。我不了解其工作原理的整个机制，但显然使用该配置文件构建会更改一些在运行时将其置于纯YARN模式的默认值。
所以，如果你得到这个，请使用
重建mvn -Phadoop_yarn clean package
这可能会解决它。