Hi chenqizhu, this exception doesn't seem to come from Flink, but rather from a YARN container bootstrap.
When YARN container starts up, it needs to download resources from HDFS (your job archives / configuration / distributed cache / ...) which are necessary for startup of the user application (in Flink case JobManager / TaskManager). As far as I can tell, the affected NodeManager tries to pull data from a filesystem it doesn't have access to (refer to hdfs-site.conf / yarn logs on the particular node). question : Why cannot flink-conf(flink.hadoop.*) overwrite the > configurations read by YARN NodeManager ? > In this case the exception happens before any Flink code is executed by the NodeManager. I think NM logs can help you identify which files are not accessible by YARN, that could narrow it down a bit. Best, D. On Tue, Nov 30, 2021 at 9:23 AM chenqizhu <qizhu...@163.com> wrote: > hi, > Flink version 1.13 supports configuration of Hadoop properties in > flink-conf.yaml via flink.hadoop.*. There is A requirement to write > checkpoint to HDFS with SSDS (called Bcluster ) to speed checkpoint > writing, but this HDFS cluster is not the default HDFS in the flink client > (called Acluster ). Yaml is configured with nameservices for cluster A and > cluster B, which is similar to HDFS federated mode. > > The configuration is as follows: > > flink.hadoop.dfs.nameservices: ACluster,BCluster > flink.hadoop.fs.defaultFS: hdfs://BCluster > flink.hadoop.dfs.ha.namenodes.ACluster: nn1,nn2 > flink.hadoop.dfs.namenode.rpc-address.ACluster.nn1: 10.xxxx:9000 > flink.hadoop.dfs.namenode.http-address.ACluster.nn1: 10.xxxx:50070 > flink.hadoop.dfs.namenode.rpc-address.ACluster.nn2: 10.xxxxxx:9000 > flink.hadoop.dfs.namenode.http-address.ACluster.nn2: 10.xxxxxx:50070 > flink.hadoop.dfs.client.failover.proxy.provider.ACluster: > org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider > > flink.hadoop.dfs.ha.namenodes.BCluster: nn1,nn2 > flink.hadoop.dfs.namenode.rpc-address.BCluster.nn1: 10.xxxxxx:9000 > flink.hadoop.dfs.namenode.http-address.BCluster.nn1: 10.xxxxxx:50070 > flink.hadoop.dfs.namenode.rpc-address.BCluster.nn2: 10.xxxxxx:9000 > flink.hadoop.dfs.namenode.http-address.BCluster.nn2: 10.xxxxx:50070 > flink.hadoop.dfs.client.failover.proxy.provider.BCluster: > org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider > > However, an error occurred during the startup of the job, which is > reported as follows: > > (change configuration items to A flink local client default HDFS cluster, > the operation can be normal boot: flink.hadoop.fs.DefaultFS: hdfs: / / > ACluster) > > > Failing this attempt.Diagnostics: [2021-11-30 > 15:39:15.582]java.net.UnknownHostException: BCluster > > java.lang.IllegalArgumentException: java.net.UnknownHostException: BCluster > > at > org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:448) > at > org.apache.hadoop.hdfs.NameNodeProxiesClient.createProxyWithClientProtocol(NameNodeProxiesClient.java:139) > at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:374) > at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:308) > at > org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:184) > at > org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:3414) > at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:158) > at > org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:3474) > at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:3442) > at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:524) > at org.apache.hadoop.fs.Path.getFileSystem(Path.java:365) > at > org.apache.hadoop.yarn.util.FSDownload.verifyAndCopy(FSDownload.java:270) > at org.apache.hadoop.yarn.util.FSDownload.access$000(FSDownload.java:68) > at org.apache.hadoop.yarn.util.FSDownload$2.run(FSDownload.java:415) > at org.apache.hadoop.yarn.util.FSDownload$2.run(FSDownload.java:412) > at java.security.AccessController.doPrivileged(Native Method) > at javax.security.auth.Subject.doAs(Subject.java:422) > at > org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1845) > at org.apache.hadoop.yarn.util.FSDownload.call(FSDownload.java:412) > at > org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ContainerLocalizer$FSDownloadWrapper.doDownloadCall(ContainerLocalizer.java:247) > at > org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ContainerLocalizer$FSDownloadWrapper.call(ContainerLocalizer.java:240) > at > org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ContainerLocalizer$FSDownloadWrapper.call(ContainerLocalizer.java:228) > at java.util.concurrent.FutureTask.run(FutureTask.java:266) > at > java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) > at java.util.concurrent.FutureTask.run(FutureTask.java:266) > at > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) > at java.lang.Thread.run(Thread.java:745) > Caused by: java.net.UnknownHostException: BCluster > > ... 28 more > > Caused by: BCluster > java.net.UnknownHostException: BCluster > at > org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:448) > at > org.apache.hadoop.hdfs.NameNodeProxiesClient.createProxyWithClientProtocol(NameNodeProxiesClient.java:139) > at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:374) > at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:308) > at > org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:184) > at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:3414) > at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:158) > at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:3474) > at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:3442) > at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:524) > at org.apache.hadoop.fs.Path.getFileSystem(Path.java:365) > at org.apache.hadoop.yarn.util.FSDownload.verifyAndCopy(FSDownload.java:270) > at org.apache.hadoop.yarn.util.FSDownload.access$000(FSDownload.java:68) > at org.apache.hadoop.yarn.util.FSDownload$2.run(FSDownload.java:415) > at org.apache.hadoop.yarn.util.FSDownload$2.run(FSDownload.java:412) > at java.security.AccessController.doPrivileged(Native Method) > at javax.security.auth.Subject.doAs(Subject.java:422) > at > org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1845) > at org.apache.hadoop.yarn.util.FSDownload.call(FSDownload.java:412) > at > org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ContainerLocalizer$FSDownloadWrapper.doDownloadCall(ContainerLocalizer.java:247) > at > org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ContainerLocalizer$FSDownloadWrapper.call(ContainerLocalizer.java:240) > at > org.apache.hadoop.yarn.server.nodemanager.containermanager.localizer.ContainerLocalizer$FSDownloadWrapper.call(ContainerLocalizer.java:228) > at java.util.concurrent.FutureTask.run(FutureTask.java:266) > at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) > at java.util.concurrent.FutureTask.run(FutureTask.java:266) > at > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) > at java.lang.Thread.run(Thread.java:745) > > question : Why cannot flink-conf(flink.hadoop.*) overwrite the > configurations read by YARN NodeManager ? > Is there a solution to the above problems? The pain point is that Flink > can access two HDFS clusters, preferably through the configuration of > Flink-conf. yaml. > The attachments is the client log file. > > Best regards > > > >
