报错背景
安装Flink on yarn集群，Flink集群无法启动。
版本：
flink-1.14.4
hadoop-3.2.3
报错现象
2022-04-18 10:32:31,809 ERROR org.apache.flink.runtime.entrypoint.ClusterEntrypoint [] - Could not start cluster entrypoint StandaloneSessionClusterEntrypoint.
org.apache.flink.runtime.entrypoint.ClusterEntrypointException: Failed to initialize the cluster entrypoint StandaloneSessionClusterEntrypoint.
at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.startCluster(ClusterEntrypoint.java:216) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.runClusterEntrypoint(ClusterEntrypoint.java:617) [flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.entrypoint.StandaloneSessionClusterEntrypoint.main(StandaloneSessionClusterEntrypoint.java:59) [flink-dist_2.12-1.14.4.jar:1.14.4]
Caused by: java.io.IOException: Could not create FileSystem for highly available storage path (hdfs://flink/ha/default)
at org.apache.flink.runtime.blob.BlobUtils.createFileSystemBlobStore(BlobUtils.java:92) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.blob.BlobUtils.createBlobStoreFromConfig(BlobUtils.java:76) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.highavailability.HighAvailabilityServicesUtils.createHighAvailabilityServices(HighAvailabilityServicesUtils.java:121) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.createHaServices(ClusterEntrypoint.java:361) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.initializeServices(ClusterEntrypoint.java:318) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.runCluster(ClusterEntrypoint.java:243) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.lambda$startCluster$1(ClusterEntrypoint.java:193) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.security.contexts.NoOpSecurityContext.runSecured(NoOpSecurityContext.java:28) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.startCluster(ClusterEntrypoint.java:190) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
... 2 more
Caused by: org.apache.flink.core.fs.UnsupportedFileSystemSchemeException: Could not find a file system implementation for scheme 'hdfs'. The scheme is not directly supported by Flink and no Hadoop file system to support this scheme could be loaded. For a full list of supported file systems, please see https://nightlies.apache.org/flink/flink-docs-stable/ops/filesystems/.
at org.apache.flink.core.fs.FileSystem.getUnguardedFileSystem(FileSystem.java:532) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.core.fs.FileSystem.get(FileSystem.java:409) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.core.fs.Path.getFileSystem(Path.java:274) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.blob.BlobUtils.createFileSystemBlobStore(BlobUtils.java:89) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.blob.BlobUtils.createBlobStoreFromConfig(BlobUtils.java:76) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.highavailability.HighAvailabilityServicesUtils.createHighAvailabilityServices(HighAvailabilityServicesUtils.java:121) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.createHaServices(ClusterEntrypoint.java:361) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.initializeServices(ClusterEntrypoint.java:318) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.runCluster(ClusterEntrypoint.java:243) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.lambda$startCluster$1(ClusterEntrypoint.java:193) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.security.contexts.NoOpSecurityContext.runSecured(NoOpSecurityContext.java:28) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.startCluster(ClusterEntrypoint.java:190) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
... 2 more
Caused by: org.apache.flink.core.fs.UnsupportedFileSystemSchemeException: Cannot support file system for 'hdfs' via Hadoop, because Hadoop is not in the classpath, or some classes are missing from the classpath.
at org.apache.flink.runtime.fs.hdfs.HadoopFsFactory.create(HadoopFsFactory.java:189) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.core.fs.FileSystem.getUnguardedFileSystem(FileSystem.java:528) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.core.fs.FileSystem.get(FileSystem.java:409) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.core.fs.Path.getFileSystem(Path.java:274) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.blob.BlobUtils.createFileSystemBlobStore(BlobUtils.java:89) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.blob.BlobUtils.createBlobStoreFromConfig(BlobUtils.java:76) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.highavailability.HighAvailabilityServicesUtils.createHighAvailabilityServices(HighAvailabilityServicesUtils.java:121) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.createHaServices(ClusterEntrypoint.java:361) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.initializeServices(ClusterEntrypoint.java:318) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.runCluster(ClusterEntrypoint.java:243) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.lambda$startCluster$1(ClusterEntrypoint.java:193) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.security.contexts.NoOpSecurityContext.runSecured(NoOpSecurityContext.java:28) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.startCluster(ClusterEntrypoint.java:190) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
... 2 more
Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.apache.flink.runtime.util.HadoopUtils
at org.apache.flink.runtime.fs.hdfs.HadoopFsFactory.create(HadoopFsFactory.java:84) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.core.fs.FileSystem.getUnguardedFileSystem(FileSystem.java:528) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.core.fs.FileSystem.get(FileSystem.java:409) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.core.fs.Path.getFileSystem(Path.java:274) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.blob.BlobUtils.createFileSystemBlobStore(BlobUtils.java:89) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.blob.BlobUtils.createBlobStoreFromConfig(BlobUtils.java:76) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.highavailability.HighAvailabilityServicesUtils.createHighAvailabilityServices(HighAvailabilityServicesUtils.java:121) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.createHaServices(ClusterEntrypoint.java:361) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.initializeServices(ClusterEntrypoint.java:318) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.runCluster(ClusterEntrypoint.java:243) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.lambda$startCluster$1(ClusterEntrypoint.java:193) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.security.contexts.NoOpSecurityContext.runSecured(NoOpSecurityContext.java:28) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
at org.apache.flink.runtime.entrypoint.ClusterEntrypoint.startCluster(ClusterEntrypoint.java:190) ~[flink-dist_2.12-1.14.4.jar:1.14.4]
... 2 more
报错原因
because Hadoop is not in the classpath, or some classes are missing from the classpath
报错解决
添加环境变量
[hadoop@bigdata1 app]$ vim /home/hadoop/.bashrc 追加以下内容： # Hadoop环境变量 export HADOOP_HOME=/home/hadoop/app/hadoop export PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin export HADOOP_CLASSPATH=`hadoop classpath`
[hadoop@bigdata1 app]$ source /home/hadoop/.bashrc
重启Flink即可。