Thanks Peter
I had implemented the JCAS pool from uima in the servlet as well , which
gives same error when servlet is accessed parallel, seems as there is some
resources which gets blocked ... which are used by the annotators possibly
LVG/POSTAGGER. As servlet threads try to access the same resources
/pipeline instantiated. the demo sevlet creates the pipleline /AE whilie
initializing.
Here is the CAS pool thing which UIMA docs suggest for multi processing.
pipeline = aggregateBuilder.createAggregate();
jc = new JCasPool(5, pipeline);
int s = jc.getSize();
doPost{
JCas jcas = jc.getJCas(0);
jcas.setDocumentText(text);
pipeline.process(jcas);
}
Yes i also thing to create a object pool for AEs i.e instantiate multiple
AE pipeline objects in init servlet method ... dopost will use the object
from that pool. If you some code snippet, kindly share (newbie to ctakes
and java as well :))
On Fri, Feb 3, 2017 at 10:24 PM, Abramowitsch, Peter <
[email protected]> wrote:
> I've had some experience pipelining ctakes behind a servlet (not the demo
> servlet) and, without going deep into the code, My feeling is that there
> are no globally static data resources with instance level content. It's
> all just configuration and dictionaries. Threading errors would only
> occur if threads shared a CAS object. Or if one thread was trying to
> modify the configuration that another thread was using.
>
> If you're looking for high performance, I would keep a small pool of
> instantiated CAS objects with their Annotators loaded. Then as each
> request comes in via a different thread, you grab a CAS off the pool, call
> reset on it to clean out all the annotations and then run the annotation
> process, output put the contents and hand it back to the pool. Obviously
> entrance and exit to the pool resources would have to be guarded by
> semaphores or another thread safe mechanism.
>
> - Peter
>
>
> On 2/2/17, 1:47 PM, "shahid ashraf" <[email protected]> wrote:
>
> >Thanks sean..
> >
> >Seems it might have issue with thread safety of ctakes modules... mainly
> >postagger. i too am guessing :P
> >
> >
> >On Fri, Feb 3, 2017 at 2:46 AM, Finan, Sean <
> >[email protected]> wrote:
> >
> >> Hi Shahid,
> >>
> >>
> >>
> >> Just fyi, That client app is not part of ctakes or supported by the
> >> general ctakes community. My initial guess would be that it ran out of
> >> memory or had an empty or unreadable document. Again, this is a
> >>complete
> >> shot in the dark as I don¹t use that servlet and the error report has
> >> nothing specific with regard to ctakes.
> >>
> >>
> >>
> >> Sean
> >>
> >>
> >>
> >> *From:* shahid ashraf [mailto:[email protected]]
> >> *Sent:* Thursday, February 02, 2017 8:37 AM
> >> *To:* Finan, Sean; [email protected]; Andrey Kurdumov;
> >> [email protected]
> >> *Subject:* Annotator processing failed
> >>
> >>
> >>
> >> I am using ctakes examples java servlet from here
> >>https://urldefense.proofpoint.com/v2/url?u=http-
> 3A__healthnlp.github&d=Dw
> >>IFaQ&c=B73tqXN8Ec0ocRmZHMCntw&r=5LM1YwNyMUq7CWiSepCCsjTjwuVF4u
> swNF8BK5Orm
> >>10&m=n62PXSo5vUbtPKgTOb6r9eHOKo1b0coTcSA0ZvIfOvc&s=
> yxBTEl4n0E2IfwyzT99vkS
> >>KjRtANaj73OXm5RPPgVqw&e= .
> >> io/examples/
> >>
> >><https://urldefense.proofpoint.com/v2/url?u=http-
> 3A__healthnlp.github.io_
> >>examples_&d=DwMFaQ&c=qS4goWBT7poplM69zy_3xhKwEW14JZMSdioCoppxeFU&r=
> fs67Gv
> >>lGZstTpyIisCYNYmQCP6r0bcpKGd4f7d4gTao&m=-pS4a8HsJtgy3fXJt8JmXdvd3X9gG3l
> 5U
> >>R-hkoRDG0A&s=qaWZ-ReKaj42RMRONEYR2tHoDSKM2KFJT9DyzNdzNi4&e=>
> >>
> >> After processing some documents maybe 1000+ it gets this error
> >>
> >> javax.servlet.ServletException:
> >>org.apache.uima.analysis_engine.AnalysisEngineProcessException:
> >>Annotator processing failed.
> >>
> >>
> >>org.apache.ctakes.web.client.servlet.DemoServlet.
> doPost(DemoServlet.java:
> >>103)
> >>
> >> javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
> >>
> >> javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
> >>
> >>
> >>org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
> >>
> >> *root cause*
> >>
> >> org.apache.uima.analysis_engine.AnalysisEngineProcessException:
> >>Annotator processing failed.
> >>
> >>
> >>org.apache.uima.analysis_engine.impl.PrimitiveAnalysisEngine_impl.
> callAna
> >>lysisComponentProcess(PrimitiveAnalysisEngine_impl.java:412)
> >>
> >>
> >>org.apache.uima.analysis_engine.impl.PrimitiveAnalysisEngine_impl.
> process
> >>AndOutputNewCASes(PrimitiveAnalysisEngine_impl.java:314)
> >>
> >>
> >>org.apache.uima.analysis_engine.asb.impl.ASB_impl$
> AggregateCasIterator.pr
> >>ocessUntilNextOutputCas(ASB_impl.java:570)
> >>
> >>
> >>org.apache.uima.analysis_engine.asb.impl.ASB_impl$
> AggregateCasIterator.<i
> >>nit>(ASB_impl.java:412)
> >>
> >>
> >>org.apache.uima.analysis_engine.asb.impl.ASB_impl.
> process(ASB_impl.java:3
> >>44)
> >>
> >>
> >>org.apache.uima.analysis_engine.impl.AggregateAnalysisEngine_impl.
> process
> >>AndOutputNewCASes(AggregateAnalysisEngine_impl.java:265)
> >>
> >>
> >>org.apache.uima.analysis_engine.asb.impl.ASB_impl$
> AggregateCasIterator.pr
> >>ocessUntilNextOutputCas(ASB_impl.java:570)
> >>
> >>
> >>org.apache.uima.analysis_engine.asb.impl.ASB_impl$
> AggregateCasIterator.<i
> >>nit>(ASB_impl.java:412)
> >>
> >>
> >>org.apache.uima.analysis_engine.asb.impl.ASB_impl.
> process(ASB_impl.java:3
> >>44)
> >>
> >>
> >>org.apache.uima.analysis_engine.impl.AggregateAnalysisEngine_impl.
> process
> >>AndOutputNewCASes(AggregateAnalysisEngine_impl.java:265)
> >>
> >>
> >>org.apache.uima.analysis_engine.impl.AnalysisEngineImplBase.
> process(Analy
> >>sisEngineImplBase.java:269)
> >>
> >>
> >>org.apache.uima.analysis_engine.impl.AnalysisEngineImplBase.
> process(Analy
> >>sisEngineImplBase.java:284)
> >>
> >>
> >>org.apache.ctakes.web.client.servlet.DemoServlet.
> doPost(DemoServlet.java:
> >>92)
> >>
> >> javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
> >>
> >> javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
> >>
> >>
> >>org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
> >>
> >> *root cause*
> >>
> >> java.lang.NullPointerException
> >>
> >>
> >>
> >> --
> >>
> >> with Regards
> >>
> >> Shahid Ashraf
> >>
> >
> >
> >
> >--
> >with Regards
> >Shahid Ashraf
>
>
--
with Regards
Shahid Ashraf
