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  1. UIMA
  2. UIMA-1248

ResourceManager initialization is not thread-safe

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Details

    • Bug
    • Status: Resolved
    • Minor
    • Resolution: Fixed
    • 2.2.2, 2.3
    • 2.6.0SDK
    • Core Java Framework
    • None

    Description

      If multiple threads concurrently call UIMAFramework.produceAnalysisEngine and pass the same instance of ResourceManager as an argument, you can get intermittent exceptions in the ResourceManager such as:
      java.lang.ArrayIndexOutOfBoundsException
      at java.lang.System.arraycopy(Native Method)
      at java.util.ArrayList.ensureCapacity(ArrayList.java:170)
      at java.util.ArrayList.add(ArrayList.java:351)
      at org.apache.uima.resource.impl.CasManager_impl.addMetaData(CasManager_impl.java:82)
      at org.apache.uima.analysis_engine.impl.AnalysisEngineImplBase.initialize(AnalysisEngineImplBase.java:115)
      at org.apache.uima.analysis_engine.impl.AggregateAnalysisEngine_impl.initialize(AggregateAnalysisEngine_impl.java:126)

      The workaround is to synchronize the calls to UIMAFramework.produceAnalysisEngine. However, this is suboptimal if annotator initialization is expensive and you want it to be run in parallel on multiple cores. We should consider adding synchronization to the ResourceManager (and the classes it delegates to such as CasManager) to allow this to work.

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          is depended upon by

          Bug - A problem which impairs or prevents the functions of the product. UIMA-1223 Annotators should be initialized in the same thread that their process method will later be called on

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Closed
          is superceded by

          Improvement - An improvement or enhancement to an existing feature or task. UIMA-3688 improve multi-core possibilites with ResourceManager_impl

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Improvement - An improvement or enhancement to an existing feature or task. UIMA-3691 support multi-threaded shared contexts for CasPools for CAS Multipliers

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

          Improvement - An improvement or enhancement to an existing feature or task. UIMA-3694 allow parallel initialization of components to speed things up in multi-core sys

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Resolved
          relates to

          Improvement - An improvement or enhancement to an existing feature or task. UIMA-1249 CasManager_impl logic for lazy merge of the type system could lead to excessive work or missed errors

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Resolved
          supercedes

          Improvement - An improvement or enhancement to an existing feature or task. UIMA-1598 make CasManager_impl thread-safe

          • Minor - Minor loss of function, or other problem where easy workaround is present.
          • Resolved

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            People

              schor Marshall Schor
              alally Adam P. Lally
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              Dates

                Created:
                Updated:
                Resolved: