Replicating Data Store

[loproman <lo...@gmail.com>]

Hi Thomas,

Thanks for the reply, it definitely clears a few things up for me. I like
your suggestion of a new Data Store. On a scale of 1-10, how difficult do
you think it would be? 

I was thinking it would be a matter of launching a thread for each write
operation performed. There would have to be a database configured on the
second drive, but after the write completes the threads just join. This
would keep everything in sync as far as I can tell (with the exception of a
hardware error). This doesn't seem like a huge modification outside of
adding some configuration options and probably duplication of the schema to
the second drive on init.

Your thoughts?



Thomas Mueller-6 wrote:
> 
> Hi,
> 
>> Right now I'm assuming binary data is written directly to the
>> file system even when using "SimpleDbPersistenceManager".
> 
> You can configure this. See
> http://jackrabbit.apache.org/api-1/org/apache/jackrabbit/core/state/db/SimpleDbPersistenceManager.html
> 
> SimpleDbPersistenceManager
>  It is configured through the following properties:
>     * driver: the FQN name of the JDBC driver class
>     * url: the database url of the form jdbc:subprotocol:subname
>     * user: the database user
>     * password: the user's password
>     * schema: type of schema to be used (e.g. mysql, mssql, etc.);
>     * schemaObjectPrefix: prefix to be prepended to schema objects
>     * externalBLOBs: if true (the default) BINARY values (BLOBs) are
> stored in the local file system; if false BLOBs are stored in the
> database
> 
> The last option is what you are looking for.
> 
> Another idea would be to use the new DataStore, but first somebody
> would need to build a 'replicating data store'.
> 
> Thomas
> 
> 

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Does jackrabbit support global transactions using Tomcat?

[Jim Jones <jo...@trivantisdev.com>]

If so, how do you configure it? and which 3rd party transaction mgr 
should you use?

I specifically want to rollback or commit a transaction that modifies1 
or more workspaces and 1 or more non-jackrabbit databases.

If not, is there a plan to in the future?

Re: Replicating Data Store

[Thomas Mueller <th...@gmail.com>]

Hi,

> new Data Store. On a scale of 1-10, how difficult do you think it would be?

Not that difficult, maybe 5.

> I was thinking it would be a matter of launching a thread for each write
> operation performed.

I would do it like this:

while(true) {
  readBlock(4K);
  if(end) break;
  sendBlockOverNetworkAsynchronously();
  writeBlockToDisk(); // blocks
}
waitForNetwork(); // blocks

> There would have to be a database configured on the
> second drive,

Not when using the FileDataStore. There is currently no
DatabaseDataStore (but probably somebody will write one).

Thomas