Spring and OSGi support
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Key: HADOOP-4604
URL: https://issues.apache.org/jira/browse/HADOOP-4604
Project: Hadoop Core
Issue Type: New Feature
Components: dfs
Affects Versions: 0.18.2
Reporter: Jon Brisbin
I was able to compile 0.18.2 in eclipse into a new OSGi bundle using eclipse
PDE. Using Spring to control the HDFS nodes, however, seems out of the question
for the time being because of inter-dependencies between packages that should
be separate OSGi bundles (for example, SecondaryNameNode includes direct
references to StatusHttpServer, which should be in a bundle with a "web"
personality that is separate from Hadoop Core). Looking through the code that
starts the daemons, it would seem code changes are necessary to allow for
components to be dependency-injected. Rather than instantiating a
StatusHttpServer inside the SecondaryNameNode, that reference should (at the
very least) be able to be dependency-injected (for example from an OSGi service
from another bundle). Adding setters for infoServer would allow that reference
to be injected by Spring. This is just an example of the changes that would
need to be made to get Hadoop to live happily inside an OSGi container.
As a starting point, it would be nice if Hadoop core was able to be split into
a client bundle that could be deployed into OSGi containers that would provide
client-only access to HDFS clusters.
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