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Date: Tue, 8 Nov 2016 22:46:59 +0000 (UTC)
From: "Sean Busbey (JIRA)" <jira@apache.org>
To: common-issues@hadoop.apache.org
Message-ID: <JIRA.12788085.1428091706000.226661.1478645219951@Atlassian.JIRA>
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Subject: [jira] [Commented] (HADOOP-11804) POC Hadoop Client w/o transitive
 dependencies
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archived-at: Tue, 08 Nov 2016 22:47:01 -0000


    [ https://issues.apache.org/jira/browse/HADOOP-11804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15649040#comment-15649040 ] 

Sean Busbey commented on HADOOP-11804:
--------------------------------------

{quote}
I tried it with Avro and got NoClassDefFound for Log4J

I think this is expected based on the contents of the hadoop-client-runtime pom.xml, which marks log4j as optional.
{quote}

Yes, that's correct. Since Avro uses JobConf it will have to add a dependency on log4j. I'll make sure to call that out in docs that provide examples of use. If I wanted to try to refactor out the use of log4j in JobConf, do you think that'd be feasible in time for 3.0?

{quote}
I decompiled the SerializationFactory class, and noticed that it messed with the config key. I think we need to add some kind of exclusion for CommonConfigurationKeysPublic.
{code}
    // before
    if (conf.get(CommonConfigurationKeys.IO_SERIALIZATIONS_KEY).equals("")) {
    // decompiled
    if (conf.get("org.apache.hadoop.shaded.io.serializations").equals("")) {
{code}
{quote}

Interesting. Let me figure out a test for this and come up with a fix.


> POC Hadoop Client w/o transitive dependencies
> ---------------------------------------------
>
>                 Key: HADOOP-11804
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11804
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: build
>            Reporter: Sean Busbey
>            Assignee: Sean Busbey
>         Attachments: HADOOP-11804.1.patch, HADOOP-11804.2.patch, HADOOP-11804.3.patch, HADOOP-11804.4.patch, HADOOP-11804.5.patch, HADOOP-11804.6.patch, HADOOP-11804.7.patch
>
>
> make a hadoop-client-api and hadoop-client-runtime that i.e. HBase can use to talk with a Hadoop cluster without seeing any of the implementation dependencies.
> see proposal on parent for details.


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