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Posted to common-dev@hadoop.apache.org by "Kai Sasaki (JIRA)" <ji...@apache.org> on 2016/04/21 07:44:25 UTC

[jira] [Created] (HADOOP-13044) Upgrade httpcomponents to avoid CLASSPATH confliction

Kai Sasaki created HADOOP-13044:
-----------------------------------

             Summary: Upgrade httpcomponents to avoid CLASSPATH confliction
                 Key: HADOOP-13044
                 URL: https://issues.apache.org/jira/browse/HADOOP-13044
             Project: Hadoop Common
          Issue Type: Improvement
            Reporter: Kai Sasaki
            Assignee: Kai Sasaki


In case of using AWS SDK in the classpath of hadoop, we faced an issue caused by incompatiblity of AWS SDK and httpcomponents.

{code}
java.lang.NoSuchFieldError: INSTANCE
	at com.amazonaws.http.conn.SdkConnectionKeepAliveStrategy.getKeepAliveDuration(SdkConnectionKeepAliveStrategy.java:48)
	at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:535)
	at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:906)
	at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:805)
{code}

The latest AWS SDK depends on 4.3.x which has [DefaultConnectionKeepAliveStrategy.INSTANCE|http://hc.apache.org/httpcomponents-client-4.3.x/httpclient/apidocs/org/apache/http/impl/client/DefaultConnectionKeepAliveStrategy.html#INSTANCE]. This field is introduced from 4.3.

This will allow us to avoid {{CLASSPATH}} confliction around httpclient versions.





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