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From Aljoscha Krettek <aljos...@apache.org>
Subject Re: Kinesis connector classpath issue when running Flink 1.1-SNAPSHOT on YARN
Date Fri, 17 Jun 2016 13:53:52 GMT
Hi,
I think the problem with the missing Class
com.amazon.ws.emr.hadoop.fs.EmrFileSystem is not specific to RocksDB. The
exception is thrown in the FsStateBackend, which is internally used by the
RocksDB backend to do snapshotting of non-partitioned state. The problem is
that the FsStateBackend tries to verify that the checkpoint path exists in
the constructor. The constructor is invoked in the client program, when not
running in the Yarn context where the correct jars that hold the EMR
FileSystem classes are available. This should be causing the exception.

Just to verify, could you maybe run it with the FsStateBackend to see if
you get the same exception. If yes, then we need to remove the verify step
in the FsStateBackend or at least provide a way to bypass these steps.

Cheers,
Aljoscha

On Fri, 17 Jun 2016 at 15:40 Josh <jofo90@gmail.com> wrote:

> I found that I can still write to s3, using my Flink build of
> 1.1-SNAPSHOT, for example if I run the word count example:
> ./bin/flink run ./examples/batch/WordCount.jar --input hdfs:///tmp/LICENSE
> --output s3://permutive-flink/wordcount-result.txt
>
> This works fine - it's just the RocksDBStateBackend which is erroring
> with the s3 URI. I'm wondering if it could be an issue with
> RocksDBStateBackend?
>
>
> On Fri, Jun 17, 2016 at 12:09 PM, Josh <jofo90@gmail.com> wrote:
>
>> Hi Gordon/Fabian,
>>
>> Thanks for helping with this! Downgrading the Maven version I was using
>> to build Flink appears to have fixed that problem - I was using Maven 3.3.3
>> before and have downgraded to 3.2.5.
>>
>> Just for reference, I printed the loaded class at runtime and found that
>> when I was using Flink built with Maven 3.3.3, it was pulling in:
>>
>> jar:file:/opt/flink/flink-1.1-SNAPSHOT/lib/flink-dist_2.11-1.1-SNAPSHOT.jar!/org/apache/http/params/HttpConnectionParams.class
>> But after building with the older Maven version, it pulled in the class
>> from my jar:
>>
>> jar:file:/tmp/my-assembly-1.0.jar!/org/apache/http/params/HttpConnectionParams.class
>>
>>
>> Unfortunately now that problem is fixed I've now got a different
>> classpath issue. It started with:
>>
>> java.lang.RuntimeException: java.lang.ClassNotFoundException: Class
>> com.amazon.ws.emr.hadoop.fs.EmrFileSystem not found
>> at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2227)
>> at
>> org.apache.flink.runtime.fs.hdfs.HadoopFileSystem.getHadoopWrapperClassNameForFileSystem(HadoopFileSystem.java:460)
>> at
>> org.apache.flink.core.fs.FileSystem.getHadoopWrapperClassNameForFileSystem(FileSystem.java:352)
>> at org.apache.flink.core.fs.FileSystem.get(FileSystem.java:280)
>> at
>> org.apache.flink.runtime.state.filesystem.FsStateBackend.validateAndNormalizeUri(FsStateBackend.java:383)
>> at
>> org.apache.flink.runtime.state.filesystem.FsStateBackend.<init>(FsStateBackend.java:175)
>> at
>> org.apache.flink.runtime.state.filesystem.FsStateBackend.<init>(FsStateBackend.java:144)
>> at
>> org.apache.flink.contrib.streaming.state.RocksDBStateBackend.<init>(RocksDBStateBackend.java:205)
>>
>> This is strange because I used an s3:// checkpoint directory when running
>> Flink 1.0.3 on EMR and it worked fine. (according to
>> https://ci.apache.org/projects/flink/flink-docs-master/setup/aws.html#provide-s3-filesystem-dependency
>> no configuration should be needed to use S3 when running on EMR).
>>
>> Anyway I tried executing /etc/hadoop/conf/hadoop-env.sh before running my
>> job, as this sets up the HADOOP_CLASSPATH env var. The exception then
>> changed to:
>> java.lang.NoClassDefFoundError: org/apache/hadoop/fs/common/Abortable
>>
>> I found that this class is related to a jar called s3-dist-cp, so then I
>> tried copying that jar to Flink's lib directory from
>> /usr/share/aws/emr/s3-dist-cp/lib/*
>>
>> And now I'm back to another Kinesis connector classpath error:
>>
>> java.lang.NoClassDefFoundError: org/apache/http/conn/ssl/SSLSocketFactory
>> at
>> com.amazonaws.AmazonWebServiceClient.<init>(AmazonWebServiceClient.java:136)
>> at
>> com.amazonaws.AmazonWebServiceClient.<init>(AmazonWebServiceClient.java:120)
>> at
>> com.amazonaws.services.kinesis.AmazonKinesisClient.<init>(AmazonKinesisClient.java:157)
>> at
>> com.amazonaws.services.kinesis.AmazonKinesisClient.<init>(AmazonKinesisClient.java:137)
>> at
>> org.apache.flink.streaming.connectors.kinesis.proxy.KinesisProxy.<init>(KinesisProxy.java:76)
>> at
>> org.apache.flink.streaming.connectors.kinesis.FlinkKinesisConsumer.<init>(FlinkKinesisConsumer.java:166)
>> at
>> org.apache.flink.streaming.connectors.kinesis.FlinkKinesisConsumer.<init>(FlinkKinesisConsumer.java:140)
>> at
>> org.apache.flink.streaming.connectors.kinesis.FlinkKinesisConsumer.<init>(FlinkKinesisConsumer.java:123)
>>
>> I guess this is related to me adding a bunch of extra stuff to the
>> classpath in an attempt to solve the EmrFileSystem error. Any ideas what
>> caused that error in the first place?
>>
>> By the way, I built Flink with:
>> mvn clean install -Pinclude-kinesis,vendor-repos -DskipTests
>> -Dhadoop.version=2.7.1
>>
>> Josh
>>
>> On Fri, Jun 17, 2016 at 9:56 AM, Fabian Hueske <fhueske@gmail.com> wrote:
>>
>>> Hi Josh,
>>>
>>> I assume that you build the SNAPSHOT version yourself. I had similar
>>> version conflicts for Apache HttpCore with Flink SNAPSHOT versions on EMR.
>>> The problem is cause by a changed behavior in Maven 3.3 and following
>>> versions.
>>> Due to these changes, the dependency shading is not working correctly.
>>> That's why we use Maven 3.2 to build the Flink release artifacts.
>>>
>>> Can you check whether you used Maven 3.3 and try to downgrade to 3.2 if
>>> that was the case?
>>>
>>> Cheers, Fabian
>>>
>>> 2016-06-17 8:12 GMT+02:00 Tai Gordon <tzulitai@gmail.com>:
>>>
>>>> Hi Josh,
>>>>
>>>> I’m looking into the problem. Seems like the connector is somehow using
>>>> older versions of httpclient.
>>>> Can you print the loaded class path at runtime, and check the path &
>>>> version of the loaded httpclient / httpcore dependency?
>>>> i.e. `classOf[HttpConnectionParams].getResource("
>>>> HttpConnectionParams.class").toString`
>>>>
>>>> Also, on which commit was your kinesis connector built?
>>>>
>>>> Regards,
>>>> Gordon
>>>>
>>>>
>>>> On June 17, 2016 at 1:08:37 AM, Josh (jofo90@gmail.com) wrote:
>>>>
>>>> Hey,
>>>>
>>>> I've been running the Kinesis connector successfully now for a couple
>>>> of weeks, on a Flink cluster running Flink 1.0.3 on EMR 2.7.1/YARN.
>>>>
>>>> Today I've been trying to get it working on a cluster running the
>>>> current Flink master (1.1-SNAPSHOT) but am running into a classpath issue
>>>> when starting the job. This only happens when running on EMR/YARN (it's
>>>> fine when running 1.1-SNAPSHOT locally, and when running 1.0.3 on EMR)
>>>>
>>>> ----
>>>>  The program finished with the following exception:
>>>>
>>>> java.lang.NoSuchMethodError:
>>>> org.apache.http.params.HttpConnectionParams.setSoKeepalive(Lorg/apache/http/params/HttpParams;Z)V
>>>> at
>>>> com.amazonaws.http.HttpClientFactory.createHttpClient(HttpClientFactory.java:96)
>>>> at com.amazonaws.http.AmazonHttpClient.<init>(AmazonHttpClient.java:187)
>>>> at
>>>> com.amazonaws.AmazonWebServiceClient.<init>(AmazonWebServiceClient.java:136)
>>>> at
>>>> com.amazonaws.AmazonWebServiceClient.<init>(AmazonWebServiceClient.java:120)
>>>> at
>>>> com.amazonaws.services.kinesis.AmazonKinesisClient.<init>(AmazonKinesisClient.java:157)
>>>> at
>>>> com.amazonaws.services.kinesis.AmazonKinesisClient.<init>(AmazonKinesisClient.java:137)
>>>> at
>>>> org.apache.flink.streaming.connectors.kinesis.proxy.KinesisProxy.<init>(KinesisProxy.java:76)
>>>> at
>>>> org.apache.flink.streaming.connectors.kinesis.FlinkKinesisConsumer.<init>(FlinkKinesisConsumer.java:166)
>>>> at
>>>> org.apache.flink.streaming.connectors.kinesis.FlinkKinesisConsumer.<init>(FlinkKinesisConsumer.java:140)
>>>> at
>>>> org.apache.flink.streaming.connectors.kinesis.FlinkKinesisConsumer.<init>(FlinkKinesisConsumer.java:123)
>>>> ---
>>>>
>>>> Any ideas what's going on?
>>>>
>>>> The job I'm deploying has httpclient 4.3.6 and httpcore 4.3.3 which I
>>>> believe are the libraries with the HttpConnectionParams class.
>>>>
>>>> Thanks,
>>>> Josh
>>>>
>>>>
>>>
>>
>

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