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https://issues.apache.org/jira/browse/HADOOP-12499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14967781#comment-14967781
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Haohui Mai commented on HADOOP-12499:
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bq. what bits do you propose to cut here? Because the only bit you'd say is
pure server is the jetty stuff in org/apache/hadoop/http. Everything else: IPC,
security, utils, service model, they're all client-side as well. Yes, IPC
server is arguably server-side, but it is used in all hadoop IPC servers,
rather than just the core services.
My proposal is that only classes that are used to connect YARN/HDFS should
reside in {{hadoop-common-client}}. That excludes RPCServer, HA servers, jmx,
metrics, log, to just name a few.
bq. It seems to me, that a hadoop common client JAR is simply hadoop-common.jar
with all the server-side dependencies stripped from it's POM.
That might be close. The main motivation is to have clean dependency at compile
time. For example, {{hadoop-common-client}} should not depend on {{guava}}.
While it's possible exclude {{guava}} from the pom, it's practically impossible
(1) to tell whether it works until the deployment time, and (2) to enforce not
bringing in these troublesome dependency in {{hadoop-common-client}}.
> Create a client jar for hadoop-common
> -------------------------------------
>
> Key: HADOOP-12499
> URL: https://issues.apache.org/jira/browse/HADOOP-12499
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Haohui Mai
> Assignee: Haohui Mai
>
> HDFS-6200 has refactor the HDFS client implementations into the
> {{hadoop-hdfs-client}} module. However, the client module still depends on
> {{hadoop-common}} which contains both the implementation of hadoop server and
> clients.
> This jira proposes to separate client-side implementation of
> {{hadoop-common}} to a new module {{hadoop-common-client}} so that both the
> yarn and the hdfs client no longer need to transitively bring in dependency
> in the server side.
> Per feedbacks from [~steve_l] and [~cmccabe], the development will happen in
> a separate branch.
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