[jira] [Created] (HADOOP-17098) Reduce Guava dependency in Hadoop source code

["Ahmed Hussein (Jira)" <ji...@apache.org>]

Ahmed Hussein created HADOOP-17098:
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             Summary: Reduce Guava dependency in Hadoop source code
                 Key: HADOOP-17098
                 URL: https://issues.apache.org/jira/browse/HADOOP-17098
             Project: Hadoop Common
          Issue Type: Task
            Reporter: Ahmed Hussein
            Assignee: Ahmed Hussein


Relying on Guava implementation in Hadoop has been painful due to compatibility and vulnerability issues.
 Guava updates tend to break/deprecate APIs. This made It hard to maintain backward compatibility within hadoop versions and clients/downstreams.

With 3.x uses java8+, the java 8 features should preferred to Guava, reducing the footprint, and giving stability to source code.

This jira should serve as an umbrella toward an incremental effort to reduce the usage of Guava in the source code and to create subtasks to replace Guava classes with Java features.

Furthermore, it will be good to add a rule in the pre-commit build to warn against introducing a new Guava usage in certain modules.

Any one willing to take part in this code refactoring has to:
 # Focus on one module at a time in order to reduce the conflicts and the size of the patch. This will significantly help the reviewers.
 # Run all the unit tests related to the module being affected by the change. It is critical to verify that any change will not break the unit tests, or cause a stable test case to become flaky.

 

A list of sub tasks replacing Guava APIs with java8 features:
{code:java}
com.google.common.io.BaseEncoding#base64()	java.util.Base64
com.google.common.io.BaseEncoding#base64Url()	java.util.Base64
com.google.common.base.Joiner.on()	                        java.lang.String#join() or 
                                                                                         java.util.stream.Collectors#joining()
com.google.common.base.Optional#of()	                java.util.Optional#of()
com.google.common.base.Optional#absent()	        java.util.Optional#empty()
com.google.common.base.Optional#fromNullable()	java.util.Optional#ofNullable()
com.google.common.base.Optional	                        java.util.Optional
com.google.common.base.Predicate	                        java.util.function.Predicate
com.google.common.base.Function	                        java.util.function.Function
com.google.common.base.Supplier	                        java.util.function.Supplier
{code}
 

I also vote for the replacement of {{Precondition}} with either a wrapper, or Apache commons lang.

I believe you guys have dealt with Guava compatibilities in the past and probably have better insights. Any thoughts? [~weichiu], [~gabor.bota], [~stevel@apache.org], [~ayushtkn], [~busbey], [~jeagles], [~kihwal]

 



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