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  1. Red Hat Decision Manager
  2. RHDM-1341

Make LambdaIntrospector.methodFingerprintsMap cache size configurable

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Details

    • Task
    • Resolution: Done
    • Major
    • 7.8.0.GA
    • 7.7.0.GA
    • BRE
    • 2020 Week 22-24 (from May 25)

    Description

      Using the executable model, we can see a memory retention in LambdaIntrospector after reloading the kbase multiple times:

      Class Name                                                                                                            | Shallow Heap | Retained Heap
-----------------------------------------------------------------------------------------------------------------------------------------------------
org.drools.modelcompiler.util.LambdaIntrospector$1 @ 0xc62e90a8                                                       |           56 |     1,243,424
|- <class> class org.drools.modelcompiler.util.LambdaIntrospector$1 @ 0xc62c2158                                      |            0 |             0
|- head java.util.LinkedHashMap$Entry @ 0xc63577e0                                                                    |           40 |        52,080
|- table java.util.HashMap$Node[64] @ 0xd7283140                                                                      |          272 |           272
|  |- <class> class java.util.HashMap$Node[] @ 0xc02d3af8                                                             |            0 |             0
|  |- [49] java.util.LinkedHashMap$Entry @ 0xc6336bf0                                                                 |           40 |        44,472
|  |- [46] java.util.LinkedHashMap$Entry @ 0xc63577e0                                                                 |           40 |        52,080
|  |- [30] java.util.LinkedHashMap$Entry @ 0xcb4305f0                                                                 |           40 |        39,760
|  |- [35] java.util.LinkedHashMap$Entry @ 0xcb4415e0                                                                 |           40 |        23,320
|  |- [12] java.util.LinkedHashMap$Entry @ 0xcb446c08                                                                 |           40 |        22,104
|  |- [57] java.util.LinkedHashMap$Entry @ 0xcb44bd70                                                                 |           40 |        47,368
|  |- [24] java.util.LinkedHashMap$Entry @ 0xcb457f28                                                                 |           40 |        52,672
|  |- [63] java.util.LinkedHashMap$Entry @ 0xcb46a990                                                                 |           40 |        45,064
|  |- [14] java.util.LinkedHashMap$Entry @ 0xce1ccaf8                                                                 |           40 |        47,368
|  |- [45] java.util.LinkedHashMap$Entry @ 0xce1d8400                                                                 |           40 |        39,760
|  |- [54] java.util.LinkedHashMap$Entry @ 0xce1e41c0                                                                 |           40 |        23,320
|  |  |- <class> class java.util.LinkedHashMap$Entry @ 0xc02c8090 System Class                                        |            0 |             0
|  |  |- after java.util.LinkedHashMap$Entry @ 0xce1d8400                                                             |           40 |        39,760
|  |  |- key org.drools.modelcompiler.util.LambdaIntrospector$ClassIdentifier @ 0xce1e41e8                            |           24 |           280
|  |  |  |- <class> class org.drools.modelcompiler.util.LambdaIntrospector$ClassIdentifier @ 0xc62e01c0               |            0 |             0
|  |  |  |- classLoader org.drools.dynamic.DynamicProjectClassLoader$DefaultInternalTypesClassLoader @ 0xcb643360     |           64 |       581,176
|  |  |  |  |- <class> class org.drools.dynamic.DynamicProjectClassLoader$DefaultInternalTypesClassLoader @ 0xc24d3320|            8 |            32
|  |  |  |  |- projectClassLoader org.drools.dynamic.DynamicProjectClassLoader @ 0xcb5ed8b8                           |           88 |    45,501,888
-----------------------------------------------------------------------------------------------------------------------------------------------------

      LambdaIntrospector$1 extends LinkedHashMap and its cache size is 32.

      https://github.com/kiegroup/drools/blob/master/drools-model/drools-model-compiler/src/main/java/org/drools/modelcompiler/util/LambdaIntrospector.java#L38-L45

      The intent of this JIRA is to provide a flag to make this cache size configurable.

      Attachments

        Issue Links

          incorporates

          Task - Represents a small unit of work that is not end-user facing. DROOLS-5326 Make LambdaIntrospector.methodFingerprintsMap cache size configurable

          • Major - To be worked after higher priority work items are addressed. When the severity is high and the effort to change it is low to moderate, this term is chosen. Issues in this category likely have an existing workaround but implementation or execution may be non-trivial.
          • Closed

          Enhancement - An enhancement to or refactoring of existing functionality that is not configurable by an end user (typically a change made by an internal team that affects users) DROOLS-5353 Avoid ClassLoader retention in LambdaIntrospector

          • Major - To be worked after higher priority work items are addressed. When the severity is high and the effort to change it is low to moderate, this term is chosen. Issues in this category likely have an existing workaround but implementation or execution may be non-trivial.
          • Closed
          is documented by

          Task - Represents a small unit of work that is not end-user facing. BXMSDOC-5900 Document drools.lambda.introspector.cache.size system property

          • Major - To be worked after higher priority work items are addressed. When the severity is high and the effort to change it is low to moderate, this term is chosen. Issues in this category likely have an existing workaround but implementation or execution may be non-trivial.
          • Closed

          Activity

            People

              rhn-support-tkobayas Toshiya Kobayashi
              rhn-support-mputz Martin Weiler (Inactive)
              Daniel Rosa Daniel Rosa
              Daniel Rosa Daniel Rosa
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              Dates

                Created:
                Updated:
                Resolved: