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https://issues.apache.org/jira/browse/HBASE-11118?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14029336#comment-14029336
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Todd Lipcon commented on HBASE-11118:
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Have we already considered using our own classloader to isolate our dependency?
Forking PB into HBase makes me nervous from a maintenance perspective. PB does
new releases once a year or so and they tend to have good improvements - aren't
we going to end up stuck on a past version?
Instead, could we put some more pressure on the upstream protobuf maintainers
to include the ZeroCopyLiteralByteString, or at least make its super-class
non-final in order to support this?
Alternatively, could we get shading to work by adding an extra indirection
package that builds a "jar-with-dependencies" of both hbase-protocol and
protobuf, and then shades that and re-publishes as an
"hbase-protocol-with-shaded-pb" pom? Then the rest of HBase could depend on
that?
> non environment variable solution for "IllegalAccessError: class
> com.google.protobuf.ZeroCopyLiteralByteString cannot access its superclass
> com.google.protobuf.LiteralByteString"
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-11118
> URL: https://issues.apache.org/jira/browse/HBASE-11118
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.98.2
> Reporter: André Kelpe
> Assignee: Andrew Purtell
> Priority: Blocker
> Fix For: 0.99.0, 0.98.4
>
> Attachments: HBASE-11118-0.98.patch.gz, HBASE-11118-trunk.patch.gz,
> shade_attempt.patch
>
>
> I am running into the problem described in
> https://issues.apache.org/jira/browse/HBASE-10304, while trying to use a
> newer version within cascading.hbase
> (https://github.com/cascading/cascading.hbase).
> One of the features of cascading.hbase is that you can use it from lingual
> (http://www.cascading.org/projects/lingual/), our SQL layer for hadoop.
> lingual has a notion of providers, which are fat jars that we pull down
> dynamically at runtime. Those jars give users the ability to talk to any
> system or format from SQL. They are added to the classpath programmatically
> before we submit jobs to a hadoop cluster.
> Since lingual does not know upfront , which providers are going to be used in
> a given run, the HADOOP_CLASSPATH trick proposed in the JIRA above is really
> clunky and breaks the ease of use we had before. No other provider requires
> this right now.
> It would be great to have a programmatical way to fix this, when using fat
> jars.
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