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 <paullin3...@gmail.com> wrote: > > 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 <se...@apache.org> 于2018年9月21日周五 下午6:30写道： > >> Hi! >> >> The old bucketing sink does not work with the Flink file systems, it only >> works with Hadoop's direct file system support. IIRC it grabs the Flink >> File System (which creates s3a) to get the Hadoop config etc and then >> creates the Hadoop File System (s3a again). >> >> The new streaming file sink will use Flink Filesystem support, which is >> important more efficient streaming fault tolerance. S3 support will be part >> of Flink 1.7 >> >> Best, >> Stephan >> >> >> On Fri, Sep 21, 2018 at 10:41 AM Paul Lam <paullin3...@gmail.com> wrote: >> >>> 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 <se...@apache.org> 写道： >>> >>> 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.LdapGroupsMapping"? >>> >>> Please let us know if that works! >>> >>> >>> >>> On Thu, Sep 20, 2018 at 1:40 PM, Stefan Richter < >>> s.rich...@data-artisans.com> wrote: >>> 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 <paullin3...@gmail.com>: >>> > >>> > 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 >>> > >>> > >>> > >>> >>> >>> >>>
