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https://issues.apache.org/jira/browse/HDFS-2656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13452430#comment-13452430
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Jing Zhao commented on HDFS-2656:
---------------------------------
Thanks for the comment Todd! So right now we keep JNI temporarily for the
following issues:
1. Load configuration settings for Namenode hostname;
2. hdfsCopy.
3. hfdfMove.
The current implementation is to load JVM in a lazy way. We're trying to avoid
using JNI code in our next step. However, hdfsCopy/hdfsMove is not supported by
webhdfs now. It seems not simple to re-implement them in the C library. Any
suggestion about it?
> Implement a pure c client based on webhdfs
> ------------------------------------------
>
> Key: HDFS-2656
> URL: https://issues.apache.org/jira/browse/HDFS-2656
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: webhdfs
> Reporter: Zhanwei.Wang
> Assignee: Jing Zhao
> Fix For: 2.0.3-alpha
>
> Attachments: HDFS-2656.patch, HDFS-2656.patch, HDFS-2656.patch,
> HDFS-2656.unfinished.patch, teragen_terasort_teravalidate_performance.png
>
>
> Currently, the implementation of libhdfs is based on JNI. The overhead of JVM
> seems a little big, and libhdfs can also not be used in the environment
> without hdfs.
> It seems a good idea to implement a pure c client by wrapping webhdfs. It
> also can be used to access different version of hdfs.
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