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From "Afkham Azeez (JIRA)" <>
Subject [jira] Assigned: (AXIS2-4880) I have patches to fix poor scalability of ADB's POJO XMLStreamReader implementation
Date Fri, 31 Dec 2010 05:26:48 GMT


Afkham Azeez reassigned AXIS2-4880:

    Assignee: Amila Chinthaka Suriarachchi

> I have patches to fix poor scalability of ADB's POJO XMLStreamReader implementation
> -----------------------------------------------------------------------------------
>                 Key: AXIS2-4880
>                 URL:
>             Project: Axis2
>          Issue Type: Improvement
>          Components: adb
>    Affects Versions: 1.5.2
>         Environment: Debian Lenny (x86_64), Java 1.6.0 (Sun), NetBeans, Tomcat 6, POJO
web service deployed as .aar file.
>            Reporter: Dan Armstrong
>            Assignee: Amila Chinthaka Suriarachchi
>   Original Estimate: 0.5h
>  Remaining Estimate: 0.5h
> First, ADB's XMLStreamReader implementation becomes much slower when many complex types
exist in the TypeTable.  This causes many repeated interations through the entire map for
building the ADBNamespaceContext.  I have removed the necessity of this repeated iteration
>   1) TypeTable generates any missing prefixes when new QName is added
>   2) TypeTable maintains prefix->namespace and namespace->prefix mappings
>   3) ADBNamespaceContext now checks in the following order (should be functionally equivalent
to adding all complex types from TypeTable, but without the overhead):
>     a) Use any added directly to our context
>     b) Check TypeTable mappings (This is the key addition)
>     c) Check parent NamespaceContext
> Second, ADBNamespaceContext is fairly heavy weight in heap space.  I have minimized the
heap space by:
>   1) Delayed allocation of the internal ArraySet
>   2) Using new AddOneNamespaceContext implementation when one and only one QName is added
to the NamespaceContext.
> In our system we currently have 407 complex types in the TypeTable and were suffering
serious slowdown.  We have more types to add to this system so this problem needed to be addressed.
 The results of my patches to ADB in Axis 1.5.2 are:
>     Times for a series of web services calls, retrieving various lengths of heterogeneous
arrays of complex types:
>       Before modifications:
>           751.554 sec: Warm-up
>           752.395 sec: Second pass
>       After modifications:
>           138.107 sec: Warm-up
>           110.705 sec: Second pass
>       RMI (Just for comparison):
>           16.818 sec: Warm-up
>           14.059 sec: Second pass
> In summary, the new code is seven times as fast for our scenario with a higher number
of complex types.  Where may I send the patches or may I commit directly to your repositories?
> Thank you,
> Dan Armstrong
> AO Industries, Inc.

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