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List:       ceph-devel
Subject:    Re: [PATCH] Expose Ceph data location information to Hadoop
From:       Noah Watkins <jayhawk () cs ! ucsc ! edu>
Date:       2010-11-30 21:39:11
Message-ID: 89CFC754-4DC1-457F-8559-D2C50C302025 () cs ! ucsc ! edu
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> Yeah, not pretty.  A shared library wouldn't really help here either, 
> right?  And a command-line tool means additional overhead.  JNI (or 
> equivalent) calling an ioctl seems like the most appropriate tool.

Not to continually dog on JNI, but I'd like to point out another downside, and that \
is portability. Using JNI to connect to the IOCTL requires that the JNI-based Java \
code be build on all platforms. As a result, each per-node deployment of Hadoop must \
ensure it's version of the JNI connector was built for that particular architecture. \
I'm wondering how this will affect Hadoop over Ceph in terms of a sales pitch, given \
that it could require a configuration headache for large-scale deployments.

Thanks,
Noah--
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