[Bug 61630] New: [PATCH] Performance Tweaks in XSSFExportToXML

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[Bug 61630] New: [PATCH] Performance Tweaks in XSSFExportToXML

Bugzilla from bugzilla@apache.org
https://bz.apache.org/bugzilla/show_bug.cgi?id=61630

            Bug ID: 61630
           Summary: [PATCH] Performance Tweaks in XSSFExportToXML
           Product: POI
           Version: 3.17-FINAL
          Hardware: PC
            Status: NEW
          Severity: normal
          Priority: P2
         Component: XSSF
          Assignee: [hidden email]
          Reporter: [hidden email]
  Target Milestone: ---

Created attachment 35433
  --> https://bz.apache.org/bugzilla/attachment.cgi?id=35433&action=edit
Patch improving Performance

When exporting a large .xlsx with XSSExportToXML, it takes very long.

Find attached Patch, which reduced the runtime on an xlsx with 42k xpaths by
80%.

The idea for the improve is taken from:
https://www.ibm.com/developerworks/library/x-perfap2/index.html

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[Bug 61630] [PATCH] Performance Tweaks in XSSFExportToXML

Bugzilla from bugzilla@apache.org
https://bz.apache.org/bugzilla/show_bug.cgi?id=61630

Javen O'Neal <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 OS|                            |All
             Status|NEW                         |NEEDINFO

--- Comment #1 from Javen O'Neal <[hidden email]> ---
Did the private selectNode method, which is called by private getNodeByXPath,
and, in turn, other methods, affect the performance?

It looks like the general idea here is to avoid creating a NodeList, since that
eagerly traverses the XML nodes. A lazy traversal approach seems to be
significantly faster here, based on your findings.

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[Bug 61630] [PATCH] Performance Tweaks in XSSFExportToXML

Bugzilla from bugzilla@apache.org
In reply to this post by Bugzilla from bugzilla@apache.org
https://bz.apache.org/bugzilla/show_bug.cgi?id=61630

Javen O'Neal <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #35433|0                           |1
        is obsolete|                            |

--- Comment #2 from Javen O'Neal <[hidden email]> ---
Created attachment 35434
  --> https://bz.apache.org/bugzilla/attachment.cgi?id=35434&action=edit
patch improving performance, rebased

I resolved some recent merge conflicts with your patch. Rebased patch is
attach. I'll apply this once I run it against our unit test suite.

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[Bug 61630] [PATCH] Performance Tweaks in XSSFExportToXML

Bugzilla from bugzilla@apache.org
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https://bz.apache.org/bugzilla/show_bug.cgi?id=61630

--- Comment #3 from Javen O'Neal <[hidden email]> ---
Committed in r1812546.

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[Bug 61630] [PATCH] Performance Tweaks in XSSFExportToXML

Bugzilla from bugzilla@apache.org
In reply to this post by Bugzilla from bugzilla@apache.org
https://bz.apache.org/bugzilla/show_bug.cgi?id=61630

Daniel <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #4 from Daniel <[hidden email]> ---
profiling the large .xlsx file didn't mark your mentioned private methods as
hotspots. further profiling marked the private method
indexOfElementInComplexType as bottleneck. This because of many calls
performing the sort.
Introducing a Cache - just a hashmap - storing the index for an entry minimizes
the operations on the DOM. See attached my proposed patch. It significantly
Speeds up the Export for large .xlsx

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[Bug 61630] [PATCH] Performance Tweaks in XSSFExportToXML

Bugzilla from bugzilla@apache.org
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https://bz.apache.org/bugzilla/show_bug.cgi?id=61630

--- Comment #5 from Daniel <[hidden email]> ---
Created attachment 35445
  --> https://bz.apache.org/bugzilla/attachment.cgi?id=35445&action=edit
Proposing patch for further Performance improvements

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[Bug 61630] [PATCH] Performance Tweaks in XSSFExportToXML

Bugzilla from bugzilla@apache.org
In reply to this post by Bugzilla from bugzilla@apache.org
https://bz.apache.org/bugzilla/show_bug.cgi?id=61630

Javen O'Neal <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #35445|1                           |0
           is patch|                            |

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[Bug 61630] [PATCH] Performance Tweaks in XSSFExportToXML

Bugzilla from bugzilla@apache.org
In reply to this post by Bugzilla from bugzilla@apache.org
https://bz.apache.org/bugzilla/show_bug.cgi?id=61630

Javen O'Neal <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #35445|text/plain                  |application/tar+gzip
          mime type|                            |

--- Comment #6 from Javen O'Neal <[hidden email]> ---
Comment on attachment 35445
  --> https://bz.apache.org/bugzilla/attachment.cgi?id=35445
Proposing patch for further Performance improvements

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w{}£·¾±ã®ÛÛÜ|Dº?P§&)÷Ø£î7Ë2ûªýt
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[Bug 61630] [PATCH] Performance Tweaks in XSSFExportToXML

Bugzilla from bugzilla@apache.org
In reply to this post by Bugzilla from bugzilla@apache.org
https://bz.apache.org/bugzilla/show_bug.cgi?id=61630

Javen O'Neal <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #7 from Javen O'Neal <[hidden email]> ---
Can you rebase your patch to http://svn.apache.org/repos/asf/poi/trunk? r96747
looks like it might be a private repo. This patch at least predates r1812097.

If you could, please exclude whitespace changes from the patch, which makes it
quicker to review the changes (fortunately this one's short), but more
importantly reduces the likelihood of merge conflicts due to sweeping
whitespace changes.

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[Bug 61630] [PATCH] Performance Tweaks in XSSFExportToXML

Bugzilla from bugzilla@apache.org
In reply to this post by Bugzilla from bugzilla@apache.org
https://bz.apache.org/bugzilla/show_bug.cgi?id=61630

Daniel <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #8 from Daniel <[hidden email]> ---
Find attached the patch rebased to trunk. Your assumption of a private repo was
right. Sorry about that.

I just used ant -f patch.xml to create the patch, don't know how to
specifically exclude whitespaces.

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[Bug 61630] [PATCH] Performance Tweaks in XSSFExportToXML

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https://bz.apache.org/bugzilla/show_bug.cgi?id=61630

--- Comment #9 from Daniel <[hidden email]> ---
Created attachment 35450
  --> https://bz.apache.org/bugzilla/attachment.cgi?id=35450&action=edit
Last Patch rebased against trunk r1813152

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[Bug 61630] [PATCH] Performance Tweaks in XSSFExportToXML

Bugzilla from bugzilla@apache.org
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https://bz.apache.org/bugzilla/show_bug.cgi?id=61630

Javen O'Neal <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #35445|0                           |1
        is obsolete|                            |

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[Bug 61630] [PATCH] Performance Tweaks in XSSFExportToXML

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https://bz.apache.org/bugzilla/show_bug.cgi?id=61630

Javen O'Neal <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #35450|text/plain                  |application/tar+gzip
          mime type|                            |
  Attachment #35450|1                           |0
           is patch|                            |

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[Bug 61630] [PATCH] Performance Tweaks in XSSFExportToXML

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https://bz.apache.org/bugzilla/show_bug.cgi?id=61630

--- Comment #10 from Javen O'Neal <[hidden email]> ---
Thanks! Applied in r1813240 without modification.

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[Bug 61630] [PATCH] Performance Tweaks in XSSFExportToXML

Bugzilla from bugzilla@apache.org
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https://bz.apache.org/bugzilla/show_bug.cgi?id=61630

Javen O'Neal <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #11 from Javen O'Neal <[hidden email]> ---
These changes will be included in the first snapshot release of POI 4.0.0.

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[Bug 61630] [PATCH] Performance Tweaks in XSSFExportToXML

Bugzilla from bugzilla@apache.org
In reply to this post by Bugzilla from bugzilla@apache.org
https://bz.apache.org/bugzilla/show_bug.cgi?id=61630

Javen O'Neal <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |---

--- Comment #12 from Javen O'Neal <[hidden email]> ---
Looks like this broke one of our integration tests (which passes when r1813240
is reverted).
https://svn.apache.org/viewvc/poi/trunk/test-data/spreadsheet/59026.xlsx

Testcase: testAllFiles[1684: spreadsheet/59026.xlsx using
org.apache.poi.stress.XSSFFileHandler@23223dd8] took 0.016 sec
        Caused an ERROR
While handling spreadsheet/59026.xlsx
java.lang.Exception: While handling spreadsheet/59026.xlsx
        at org.apache.poi.TestAllFiles.testAllFiles(TestAllFiles.java:438)
Caused by: org.xml.sax.SAXParseException; cvc-complex-type.2.4.a: Invalid
content was found starting with element 'EmployeeInfo'. One of '{ExpenseItem}'
is expected.
        at
com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:203)
        at
com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:134)
        at
com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:396)
        at
com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:327)
        at
com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:284)
        at
com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator$XSIErrorReporter.reportError(XMLSchemaValidator.java:452)
        at
com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.reportSchemaError(XMLSchemaValidator.java:3230)
        at
com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.handleStartElement(XMLSchemaValidator.java:1790)
        at
com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.startElement(XMLSchemaValidator.java:740)
        at
com.sun.org.apache.xerces.internal.jaxp.validation.DOMValidatorHelper.beginNode(DOMValidatorHelper.java:277)
        at
com.sun.org.apache.xerces.internal.jaxp.validation.DOMValidatorHelper.validate(DOMValidatorHelper.java:244)
        at
com.sun.org.apache.xerces.internal.jaxp.validation.DOMValidatorHelper.validate(DOMValidatorHelper.java:190)
        at
com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorImpl.validate(ValidatorImpl.java:109)
        at javax.xml.validation.Validator.validate(Validator.java:124)
        at
org.apache.poi.xssf.extractor.XSSFExportToXml.isValid(XSSFExportToXml.java:259)
        at
org.apache.poi.xssf.extractor.XSSFExportToXml.exportToXML(XSSFExportToXml.java:219)
        at
org.apache.poi.xssf.extractor.XSSFExportToXml.exportToXML(XSSFExportToXml.java:105)
        at
org.apache.poi.stress.XSSFFileHandler.exportToXML(XSSFFileHandler.java:156)
        at
org.apache.poi.stress.XSSFFileHandler.handleFile(XSSFFileHandler.java:111)
        at org.apache.poi.TestAllFiles.testAllFiles(TestAllFiles.java:410)

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[Bug 61630] [PATCH] Performance Tweaks in XSSFExportToXML

Bugzilla from bugzilla@apache.org
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https://bz.apache.org/bugzilla/show_bug.cgi?id=61630

--- Comment #13 from Javen O'Neal <[hidden email]> ---
Looks to be due to the left and right xpaths being different lengths

Reading spreadsheet/59026.xlsx with class org.apache.poi.stress.XSSFFileHandler
compare() called with:
    leftXpath=/Root/EmployeeInfo/DateOfBirth
    rightXpath=/Root/EmployeeInfo/Name
indexOfElementInComplexType() called with:
    samePath = //Root/EmployeeInfo
    leftElementName=DateOfBirth
    rightElementName=Name
    complexType=null

compare() called with:
    leftXpath=/Root/EmployeeInfo/Code
    rightXpath=/Root/EmployeeInfo/DateOfBirth
indexOfElementInComplexType() called with:
    samePath = //Root/EmployeeInfo
    leftElementName=Code
    rightElementName=DateOfBirth
    complexType=null

compare() called with:
    leftXpath=/Root/ExpenseItem
    rightXpath=/Root/EmployeeInfo/Code
indexOfElementInComplexType() called with:
    samePath = //Root
    leftElementName=ExpenseItem
    rightElementName=EmployeeInfo
    complexType=null

Caused by: org.xml.sax.SAXParseException; cvc-complex-type.2.4.a: Invalid
content was found starting with element 'EmployeeInfo'. One of '{ExpenseItem}'
is expected.
Failed: spreadsheet/59026.xlsx

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[Bug 61630] [PATCH] Performance Tweaks in XSSFExportToXML

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--- Comment #14 from Javen O'Neal <[hidden email]> ---
I reverted r1813240. I'm waiting for a patch that passes the integration test
suite.

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[Bug 61630] [PATCH] Performance Tweaks in XSSFExportToXML

Bugzilla from bugzilla@apache.org
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Daniel <[hidden email]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #35450|0                           |1
        is obsolete|                            |

--- Comment #15 from Daniel <[hidden email]> ---
Created attachment 35461
  --> https://bz.apache.org/bugzilla/attachment.cgi?id=35461&action=edit
patch improving performance by using hashmap

Patch which won't break the Integration Tests. I ran 'ant test' and
TestAllFiles.java in Eclipse.

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[Bug 61630] [PATCH] Performance Tweaks in XSSFExportToXML

Bugzilla from bugzilla@apache.org
In reply to this post by Bugzilla from bugzilla@apache.org
https://bz.apache.org/bugzilla/show_bug.cgi?id=61630

Javen O'Neal <[hidden email]> changed:

           What    |Removed                     |Added
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  Attachment #35461|text/plain                  |application/tar+gzip
          mime type|                            |
  Attachment #35461|1                           |0
           is patch|                            |

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