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From "Sean Busbey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11804) POC Hadoop Client w/o transitive dependencies
Date Tue, 08 Nov 2016 22:46:59 GMT

    [ 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:

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.

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?

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.
    // before
    if (conf.get(CommonConfigurationKeys.IO_SERIALIZATIONS_KEY).equals("")) {
    // decompiled
    if (conf.get("org.apache.hadoop.shaded.io.serializations").equals("")) {

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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