On 5/1/2012 3:03 PM, Shahim Essaid wrote:
Hi Eddie,
I am new to UIMA so I might have to reread the documentation. I was
under the impression that I can use multiple threads as long as I use
a cas pool and a multi threaded AE. This is described here:
http://uima.apache.org/d/uimaj-2.4.0/tutorials_and_users_guides.html#ugr.tug.applications.multi_threaded
Did I misunderstand this part of the documentation? In my case I am
running Core UIMA and I would benefit from multitasking. (many of my
annotators have a lot of idle time waiting for responses from remote
servers)
The part of the documentation you're reading is in Chapter 3 - covering the UIMA
Application APIs. While it is quite possible to run multiple UIMA pipelines
yourself, by writing the appropriate application, most users don't do this, but
instead use one of the two scale-out capabilities that come with UIMA to handle
the complexities of doing this. This is what Eddie was referring to.
The 1st generation scaleout for UIMA was the CPE (Collection Processing
Engine). A 2nd generation scaleout is UIMA-AS (AS stands for Asynchronous
Scaleout). UIMA-AS is an separate download and adds on to base UIMA a robust
scaleout mechanism that can use multiple cores in one node, as well as clusters
of multiple machines.
-Marshall Schor
This is my first time using UIMA and I have spent too much time trying
to persist the annotations in a database because I am frequently
changing my type system and experimenting with various analysis
approaches. Keeping the schema and INSERT statements in synch with the
type system was time consuming and error prone. I would like to
automate the persistence of the annotations based on the current type
system if possible. I was looking at Liquibase as an API that could be
used during the initialization of my pipelines to update the database
schema and then write a generic JDBC based annotator to write/insert
the cas to the database. Any thoughts?
Best,
Shahim
On Tue, May 1, 2012 at 10:54 AM, Eddie Epstein<[email protected]> wrote:
Core UIMA is a single-threaded framework. There are two multi-threaded
deployment wrappers, UIMA-AS and the older CPE. Are you using one of
these wrappers?
Eddie
On Mon, Apr 30, 2012 at 2:01 PM, Shahim Essaid<[email protected]> wrote:
Hi All,
I am trying to write a primitive analysis engine that checks, and
creates or updates a database schema based on the type system. I need
to synchronize the initialization of this component so that only one
instance of the component will do this task when there are multiple
instances being instantiated.
What is the correct object to synchronize on? Is the type system
object the correct one and does it maintain its identity throughout a
JVM run? Is it a different object in the other aggregates even though
they use the same type system description?
I need to block all other threads in the other instances of the
current component until the database is updated. I also need this
object to be specific to the current aggregate so that other
aggregates running in the same JVM can have their own synchronization
objects and database updates independent of each other. In other
words, I can't use a JVM wide object.
Thank you,
Shahim
