S3 connector Hadoop class mismatch
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Hi,
I’m using StreamingFileSink of 1.6.0 to write logs to S3 and encounter a classloader problem. It seems that there are conflicts in flink-shaded-hadoop2-uber-1.6.0.jar and flink-s3-fs-hadoop-1.6.0.jar, and maybe related to class loading orders. Did anyone meet this problem? Thanks a lot! The stack traces are as below: java.io.IOException: java.lang.RuntimeException: class org.apache.hadoop.security.LdapGroupsMapping not org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security.GroupMappingServiceProvider at org.apache.flink.fs.s3hadoop.shaded.org.apache.flink.runtime.fs.hdfs.AbstractFileSystemFactory.create(AbstractFileSystemFactory.java:62) at org.apache.flink.core.fs.FileSystem.getUnguardedFileSystem(FileSystem.java:395) at org.apache.flink.core.fs.FileSystem.get(FileSystem.java:318) at org.apache.flink.streaming.api.functions.sink.filesystem.Buckets.<init>(Buckets.java:111) at org.apache.flink.streaming.api.functions.sink.filesystem.StreamingFileSink$RowFormatBuilder.createBuckets(StreamingFileSink.java:242) at org.apache.flink.streaming.api.functions.sink.filesystem.StreamingFileSink.initializeState(StreamingFileSink.java:327) at org.apache.flink.streaming.util.functions.StreamingFunctionUtils.tryRestoreFunction(StreamingFunctionUtils.java:178) at org.apache.flink.streaming.util.functions.StreamingFunctionUtils.restoreFunctionState(StreamingFunctionUtils.java:160) at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.initializeState(AbstractUdfStreamOperator.java:96) at org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:254) at org.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:738) at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:289) at org.apache.flink.runtime.taskmanager.Task.run(Task.java:711) at java.lang.Thread.run(Thread.java:748) Caused by: java.lang.RuntimeException: java.lang.RuntimeException: class org.apache.hadoop.security.LdapGroupsMapping not org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security.GroupMappingServiceProvider at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2246) at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security.Groups.<init>(Groups.java:108) at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security.Groups.<init>(Groups.java:102) at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security.Groups.getUserToGroupsMappingService(Groups.java:450) at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security.UserGroupInformation.initialize(UserGroupInformation.java:309) at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security.UserGroupInformation.ensureInitialized(UserGroupInformation.java:276) at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security.UserGroupInformation.loginUserFromSubject(UserGroupInformation.java:832) at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security.UserGroupInformation.getLoginUser(UserGroupInformation.java:802) at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:675) at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.fs.s3a.S3AFileSystem.initialize(S3AFileSystem.java:177) at org.apache.flink.fs.s3hadoop.shaded.org.apache.flink.runtime.fs.hdfs.AbstractFileSystemFactory.create(AbstractFileSystemFactory.java:57) ... 13 more Caused by: java.lang.RuntimeException: class org.apache.hadoop.security.LdapGroupsMapping not org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security.GroupMappingServiceProvider at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2240) ... 23 more Best, Paul Lam |
Re: S3 connector Hadoop class mismatch
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Hi,
I could not find any open Jira for the problem you describe. Could you please open one? Best, Stefan > Am 19.09.2018 um 09:54 schrieb Paul Lam <[hidden email]>: > > Hi, > > I’m using StreamingFileSink of 1.6.0 to write logs to S3 and encounter a classloader problem. It seems that there are conflicts in flink-shaded-hadoop2-uber-1.6.0.jar and flink-s3-fs-hadoop-1.6.0.jar, and maybe related to class loading orders. > > Did anyone meet this problem? Thanks a lot! > > The stack traces are as below: > > java.io.IOException: java.lang.RuntimeException: class org.apache.hadoop.security.LdapGroupsMapping not org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security.GroupMappingServiceProvider > at org.apache.flink.fs.s3hadoop.shaded.org.apache.flink.runtime.fs.hdfs.AbstractFileSystemFactory.create(AbstractFileSystemFactory.java:62) > at org.apache.flink.core.fs.FileSystem.getUnguardedFileSystem(FileSystem.java:395) > at org.apache.flink.core.fs.FileSystem.get(FileSystem.java:318) > at org.apache.flink.streaming.api.functions.sink.filesystem.Buckets.<init>(Buckets.java:111) > at org.apache.flink.streaming.api.functions.sink.filesystem.StreamingFileSink$RowFormatBuilder.createBuckets(StreamingFileSink.java:242) > at org.apache.flink.streaming.api.functions.sink.filesystem.StreamingFileSink.initializeState(StreamingFileSink.java:327) > at org.apache.flink.streaming.util.functions.StreamingFunctionUtils.tryRestoreFunction(StreamingFunctionUtils.java:178) > at org.apache.flink.streaming.util.functions.StreamingFunctionUtils.restoreFunctionState(StreamingFunctionUtils.java:160) > at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.initializeState(AbstractUdfStreamOperator.java:96) > at org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:254) > at org.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:738) > at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:289) > at org.apache.flink.runtime.taskmanager.Task.run(Task.java:711) > at java.lang.Thread.run(Thread.java:748) > Caused by: java.lang.RuntimeException: java.lang.RuntimeException: class org.apache.hadoop.security.LdapGroupsMapping not org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security.GroupMappingServiceProvider > at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2246) > at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security.Groups.<init>(Groups.java:108) > at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security.Groups.<init>(Groups.java:102) > at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security.Groups.getUserToGroupsMappingService(Groups.java:450) > at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security.UserGroupInformation.initialize(UserGroupInformation.java:309) > at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security.UserGroupInformation.ensureInitialized(UserGroupInformation.java:276) > at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security.UserGroupInformation.loginUserFromSubject(UserGroupInformation.java:832) > at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security.UserGroupInformation.getLoginUser(UserGroupInformation.java:802) > at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:675) > at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.fs.s3a.S3AFileSystem.initialize(S3AFileSystem.java:177) > at org.apache.flink.fs.s3hadoop.shaded.org.apache.flink.runtime.fs.hdfs.AbstractFileSystemFactory.create(AbstractFileSystemFactory.java:57) > ... 13 more > Caused by: java.lang.RuntimeException: class org.apache.hadoop.security.LdapGroupsMapping not org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security.GroupMappingServiceProvider > at org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2240) > ... 23 more > > > Best, > Paul Lam > > > |
Re: S3 connector Hadoop class mismatch
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Hi! A few questions to diagnose/fix this: Do you explicitly configure the "hadoop.security.group.mapping"? - If not, this setting may have leaked in from a Hadoop config in the classpath. We are fixing this in Flink 1.7, to make this insensitive to such settings leaking in. - If yes, then please try setting the config variable to "hadoop.security.group.mapping: org.apache.flink.fs.s3hadoop.shaded.org.apache.hadoop.security. Please let us know if that works! On Thu, Sep 20, 2018 at 1:40 PM, Stefan Richter <[hidden email]> wrote: Hi, |
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Hi Stefan, Stephan,
Yes, the `hadoop.security.group.mapping` option is explicitly set to `org.apache.hadoop.security.LdapGroupsMapping`. Guess that was why the classloader found an unshaded class. I don’t have the permission to change the Hadoop cluster configurations so I modified the `core-default-shaded.xml` and marked the option as final to solve the problem, after which the class loading exceptions were gone. But anther problem came up (likely not related to the previous problem): In case of the old bucketing sink (version 1.5.3), it seems that the `org.apache.hadoop.fs.s3a.S3AFileSystem` is initiated twice before the task starts running. The first time is called by `org.apache.flink.fs.s3hadoop.S3FileSystemFactory` and works well, but the second time is called by bucketing sink itself, and fails to leverage the `s3.*` parameters like the access key and the secret key. The stack traces are as below: ``` com.amazonaws.AmazonClientException: Unable to load AWS credentials from any provider in the chain
at com.amazonaws.auth.AWSCredentialsProviderChain.getCredentials(AWSCredentialsProviderChain.java:117)
at com.amazonaws.services.s3.AmazonS3Client.invoke(AmazonS3Client.java:3521)
at com.amazonaws.services.s3.AmazonS3Client.headBucket(AmazonS3Client.java:1031)
at com.amazonaws.services.s3.AmazonS3Client.doesBucketExist(AmazonS3Client.java:994)
at org.apache.hadoop.fs.s3a.S3AFileSystem.initialize(S3AFileSystem.java:297)
at org.apache.flink.streaming.connectors.fs.bucketing.BucketingSink.createHadoopFileSystem(BucketingSink.java:1307)
at org.apache.flink.streaming.connectors.fs.bucketing.BucketingSink.initFileSystem(BucketingSink.java:426)
at org.apache.flink.streaming.connectors.fs.bucketing.BucketingSink.initializeState(BucketingSink.java:370)
at org.apache.flink.streaming.util.functions.StreamingFunctionUtils.tryRestoreFunction(StreamingFunctionUtils.java:178)
at org.apache.flink.streaming.util.functions.StreamingFunctionUtils.restoreFunctionState(StreamingFunctionUtils.java:160)
at org.apache.flink.streaming.api.operators.AbstractUdfStreamOperator.initializeState(AbstractUdfStreamOperator.java:96)
at org.apache.flink.streaming.api.operators.AbstractStreamOperator.initializeState(AbstractStreamOperator.java:254)
at org.apache.flink.streaming.runtime.tasks.StreamTask.initializeState(StreamTask.java:730)
at org.apache.flink.streaming.runtime.tasks.StreamTask.invoke(StreamTask.java:295)
at org.apache.flink.runtime.taskmanager.Task.run(Task.java:712)
at java.lang.Thread.run(Thread.java:748)``` I haven’t figured out why the s3a filesystem needs to be initiated twice. And is it a bug that the bucketing sink does not use filesystem factories to create filesystem? Thank you very much! Best, Paul Lam 在 2018年9月20日，23:35，Stephan Ewen <[hidden email]> 写道： |
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Hi Stephan! It's bad that I'm using Hadoop 2.6, so I have to stick to the old bucketing sink. I made it by explicitly setting Hadoop conf for the bucketing sink in the user code. Thank you very much! Best, Paul Lam Stephan Ewen <[hidden email]> 于2018年9月21日周五 下午6:30写道：
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Re: S3 connector Hadoop class mismatch
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There is a Pull Request to enable the new streaming sink for Hadoop < 2.7, so it may become an option in the next release.
Thanks for bearing with us! Best, Stephan On Sat, Sep 22, 2018 at 2:27 PM Paul Lam <[hidden email]> wrote:
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