Github user hyunsik commented on a diff in the pull request:
https://github.com/apache/tajo/pull/602#discussion_r32801588
--- Diff: tajo-docs/src/main/sphinx/storage_plugin.rst ---
@@ -0,0 +1,47 @@
+*************************************
+Storage Plugin
+*************************************
+
+Overview
+========
+
+Tajo supports various storage systems, such as HDFS, Amazon S3, Openstack
Swift, and HBase. Also, we have a plan to support RDBMS storages like Oracle,
MySQL, PostgreSQL. Tajo already embeds HDFS, S3, Openstack, and HBase, and also
Tajo allows users to register custom storages and data formats to Tajo cluster
instances. This section describes how you register custom storages and data
types.
+
+Register custom storage
+=======================
+
+First of all, your storage implementation should be packed as a jar file.
Then, please copy the jar file into ``tajo/lib`` directory. Next, you should
copy ``conf/storage-site.json.template`` into ``conf/storage-site.json`` and
modify the file like the below.
--- End diff --
I've just committed ``extlib``. I'll change it. Thanks!
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