Ocean Lua created HADOOP-16950:
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Summary: Extend Hadoop S3a access from single endpoint to multiple
endpoints
Key: HADOOP-16950
URL: https://issues.apache.org/jira/browse/HADOOP-16950
Project: Hadoop Common
Issue Type: Improvement
Components: fs/s3
Affects Versions: 3.1.3
Reporter: Ocean Lua
The client API of Hadoop aws can only support a single endpoint to access.
However, there are multiple endpoints in object storage (such as ceph), and
therefore the storage resources could not be fully used. To address the issue,
we create a new Implementation of S3AFileSystem, which support multi-endpoint
access. After the optimization, system performance will increase significantly.
Usage:
1.Ensure hadoop-aws API availiable.
2.Copy hadoop-aws-3.1.1.jar and aws-java-sdk-bundle-1.11.271.jar to directory
share/hadoop/common/lib in hadoop (hadoop-aws-3.1.1.jar and
aws-java-sdk-bundle-1.11.271.jar are normally located at directory
share/hadoop/tools/lib).
3.In file etc/hadoop/hadoop-env.sh, add the following:
export HADOOP_CLASSPATH=/(hadoop root
directory)/share/hadoop/common/lib/hadoop-aws-3.1.1.jar:/(hadoop root
directory)/share/hadoop/common/lib/hadoop-aws-3.1.3.jar:$HADOOP_CLASSPATH
4.Edit configuration file "core-site.xml" and set properties below:
<property>
<name>fs.s3a.s3.client.factory.impl</name>
<value>org.apache.hadoop.fs.s3a.MultiAddrS3ClientFactory</value>
</property>
<property>
<name>fs.s3a.endpoint</name>
<value>http://addr1:port1,http://addr2:port2,...</value>
</property>
5.Optional configuration in "core-site.xml":
<property>
<name>fs.s3a.S3ClientSelector.class</name>
<value>org.apache.hadoop.fs.s3a.RandomS3ClientSelector</value>
</property>
This configuration is used to set the s3a service selection policy. The
default value is org.apache.hadoop.fs.s3a.RandomS3ClientSelector, which is a
completely random selector. The configuration can be set to
org.apache.hadoop.fs.s3a.PathS3ClientSelector, which is a selector according to
the file path.
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