Hey Martijn,
sorry for late respond.
We wanted to replace the default client with our custom S3 client and not use
the AmazonS3Client provided by the plugin.
We used Flink-s3-fs-hadoop v1.12.2 and for our needs we had to upgrade to
v1.14.0 [1].
AmazonS3 client factory is initialized[2] - if the property
"fs.s3a.s3.client.factory.impl" [3] is not provided the default factory is
created [4] which provides AmazonS3Client - which does not support what we need.
I know that both the property and the factory interface are annotated with
@InterfaceAudience.Private
@InterfaceStability.Unstable
from very early version.
but we found this solution cleaner than extend the whole class and override the
#setAmazonS3Client method.
Bottom line, all we had to do was to create our own implementation for
S3ClientFactory interface [5]
and add to flink-conf.yaml : s3.s3.client.factory.impl: <our factory canonical
name> .
place both the plugin and our artifact(with Factory and client impl) under
${FLINK_HOME}/plugins/s3
One important note: Flink-s3-fs-hadoop plugin includes the whole
com.amazonaws.s3 source code, to avoid plugin class loader issues, we needed to
remove the aws-s3-java-sdk dependency and provide the plugin dependency with
scope "provided".
If the jobs needs to do some work with S3,then shading com.amazonaws was also
necessary.
[1]
https://mvnrepository.com/artifact/org.apache.flink/flink-s3-fs-hadoop/1.14.0
[2]
https://github.com/apache/hadoop/blob/branch-3.2.2/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AFileSystem.java#L264-L266
[3]
https://github.com/apache/hadoop/blob/branch-3.2.2/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/Constants.java#L366-L369
[4]
https://github.com/apache/hadoop/blob/branch-3.2.2/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/DefaultS3ClientFactory.java#L66
[5]
https://github.com/apache/hadoop/blob/branch-3.2.2/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3ClientFactory.java
Best,
Tamir.
________________________________
From: Martijn Visser <mart...@ververica.com>
Sent: Wednesday, October 13, 2021 8:28 PM
To: Tamir Sagi <tamir.s...@niceactimize.com>; user@flink.apache.org
<user@flink.apache.org>
Subject: Re: Replacing S3 Client in Hadoop plugin
EXTERNAL EMAIL
Hi,
Could you elaborate on why you would like to replace the S3 client?
Best regards,
Martijn
On Wed, 13 Oct 2021 at 17:18, Tamir Sagi
<tamir.s...@niceactimize.com<mailto:tamir.s...@niceactimize.com>> wrote:
I found the dependency
<dependency>
<groupId>org.apache.hadoop</groupId>
<artifactId>hadoop-aws</artifactId>
<version>3.3.1</version>
</dependency>
apparently its possible, there is a method
setAmazonS3Client
I think I found the solution.
Thanks.
Tamir.
________________________________
From: Tamir Sagi
<tamir.s...@niceactimize.com<mailto:tamir.s...@niceactimize.com>>
Sent: Wednesday, October 13, 2021 5:44 PM
To: user@flink.apache.org<mailto:user@flink.apache.org>
<user@flink.apache.org<mailto:user@flink.apache.org>>
Subject: Replacing S3 Client in Hadoop plugin
Hey community.
I would like to know if there is any way to replace the S3 client in Hadoop
plugin[1] to a custom client(AmazonS3).
I did notice that Hadoop plugin supports replacing the implementation of
S3AFileSystem using
"fs.s3a.impl" (in flink-conf.yaml it will be "s3.impl") but not the client
itself [2]
<property>
<name>fs.s3a.impl</name>
<value>org.apache.hadoop.fs.s3a.S3AFileSystem</value>
<description>The implementation class of the S3A Filesystem</description>
</property>
I delved into Hadoop plugin source code [3] , the Client itself is of type
AmazonS3Client and cannot be replaced (for example) with a client of type
AmazonS3EncryptionV2.
[1]
https://ci.apache.org/projects/flink/flink-docs-master/docs/deployment/filesystems/s3/#hadooppresto-s3-file-systems-plugins
Amazon S3 | Apache
Flink<https://ci.apache.org/projects/flink/flink-docs-master/docs/deployment/filesystems/s3/#hadooppresto-s3-file-systems-plugins>
Entropy injection for S3 file systems # The bundled S3 file systems
(flink-s3-fs-presto and flink-s3-fs-hadoop) support entropy injection.Entropy
injection is a technique to improve the scalability of AWS S3 buckets through
adding some random characters near the beginning of the key.
ci.apache.org<http://ci.apache.org>
[2]
https://hadoop.apache.org/docs/stable/hadoop-aws/tools/hadoop-aws/index.html<https://hadoop.apache.org/docs/stable/hadoop-aws/tools/hadoop-aws/index.html#S3A>
[3]
https://github.com/apache/hadoop/blob/master/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/S3AFileSystem.java
Hadoop-AWS module: Integration with Amazon Web Services - Apache
Hadoop<https://hadoop.apache.org/docs/stable/hadoop-aws/tools/hadoop-aws/index.html#:~:text=property%3E%0A%0A%3Cproperty%3E%0A%20%20%3Cname%3E-,fs.s3a.impl,-%3C/name%3E%0A%20%20%3Cvalue%3Eorg>
Overview. Apache Hadoop’s hadoop-aws module provides support for AWS
integration. applications to easily use this support.. To include the S3A
client in Apache Hadoop’s default classpath: Make sure
thatHADOOP_OPTIONAL_TOOLS in hadoop-env.sh includes hadoop-aws in its list of
optional modules to add in the classpath.. For client side interaction, you can
declare that relevant JARs must be ...
hadoop.apache.org<http://hadoop.apache.org>
Thank you,
Best,
Tamir.
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