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https://issues.apache.org/jira/browse/DERBY-7073?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17077818#comment-17077818
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liaochuntao commented on DERBY-7073:
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I would love to extend the code to Derby, but there is one issue that needs to
be discussed, which is that currently Derby's slave mode does not allow any
manipulation, so can you say that slave mode supports read-only mode
> Can we override the underlying storage to implement a distributed Derby using
> Derby's subsubprotocol mechanism
> --------------------------------------------------------------------------------------------------------------
>
> Key: DERBY-7073
> URL: https://issues.apache.org/jira/browse/DERBY-7073
> Project: Derby
> Issue Type: Task
> Reporter: liaochuntao
> Priority: Trivial
>
> /**
> * derby.subSubProtocol.xxx
> *<p>
> *
> * A new subsubprotocol can be defined by specifying the class that handles
> storage for the
> * subsubprotocol by implementing the
> * org.apache.derby.io.StorageFactory StorageFactory or
> * org.apache.derby.io.WritableStorageFactory WritableStorageFactory
> interface. This
> * is done using a property named db2j.subsubprotocol.<i>xxx</i> where
> <i>xxx</i> is the subsubprotocol name.
> * Subsubprotocol names are case sensitive and must be at least 3 characters
> in length.
> *<p>
> *
> * For instance:
> *<br>
> * derby.subSubProtocol.mem=com.mycompany.MemStore
> *<br>
> * defines the "mem" subsubprotocol with class com.mycompany.MemStore as its
> StorageFactory implementation.
> * A database implemented using this subsubprotocol can be opened with the
> URL "jdbc:derby:mem:myDatabase".
> *<p>
> *
> * Subsubprotocols "directory", "classpath", "jar", "http", and "https" are
> built in and may not be overridden.
> */
>
> Can we take advantage of this capability to implement a distributed
> contribution storage, with Derby acting as the computing layer and multiple
> Derby nodes contributing a storage layer, and realize Ploar DB similar to ali
> cloud, namely a distributed Derby
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