I have patches to fix poor scalability of ADB's POJO XMLStreamReader
implementation
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Key: AXIS2-4880
URL: https://issues.apache.org/jira/browse/AXIS2-4880
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
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 by:
1) TypeTable generates prefixes when new QName is added
2) TypeTable maintains prefix->namespace and namespace->prefix mappings
3) ADBNamespaceContext now checks in this 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 alternate AddOneNamespaceContext when 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:
Before modifications:
751.554: Warm-up
752.395: Second pass
After modifications:
138.107: Warm-up
110.705: Second pass
RMI (Just for comparison):
16.818: Warm-up
14.059: Second pass
In conclusion, 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
direction to your repositories?
Thank you,
Dan Armstrong
AO Industries, Inc.
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