Author: Fabrizio Branca 1. Multithreaded XML Import …for Magento San Francisco Magento Meetup Group - October 23, 2013 2. Fabrizio Branca Lead System Developer at 3. E-Commerce: Magento CMS: TYPO3 Global Enterprise Projects Portals: ZF, FLOW,… High Performance /Scale Mobile Searchperience: SOLR 120 people in 7 offices world-wide 4. Aoe_Import github.com/AOEmedia/Aoe_Import git clone --recursive … 5. Will Aoe_Import be the fastest product importer around? YES, of course! Well, maybe… Actually, Aoe_Import is only a XML Importer “Framework”. It’s up to you to decide how to handle the xml snippets… 6. for large XML files XML! Not CSV. full flexibility in processor implementation Aoe_Import multi-thread support! Subscribe your “Processors” to xpaths Stream processing (XMLReader) “event” driven 7. memory single product Problem Memory limit time 8. Memory limit time memory memory Trivial Solution Memory limit time 9. Beat the memory Leak by forking Waiting for other thread to terminate Threading overhead Process import 10. Forking? In PHP? $pid = pcntl_fork(); if ($pid) { // parent process runs what is here echo "parentn"; } else { // child process runs what is here echo "childn"; } 11. Threadi github.com/AOEmedia/Threadi 12. Clean OOP interface for PHP to forking and process management Threadi 13. Batch Processor Collect a bunch of imports … …fork… …and process them in a child process. 14. No imports are processed in the main thread. So there’s no memory leak happing here Main thread memory Memory limit time Create process collection Waiting for other thread to terminate Threading Process imports in process collection overhead Forks Every fork starts with the low memory footprint of the main thread Find the number of imports that can be processed at a time without hitting the memory limit 15. Multi-threading? Sure! Number of threads processed in parallel Number of items in a batch 16. Problems? Database Connection Database connection doesn’t like to be cloned! Mage::getSingleton('core/resource') ->getConnection('core_write') ->closeConnection(); 17. Problems? Thread Safety 18. Problems? Thread Safety --- a/app/code/core/Enterprise/Catalog/Model/Index/Action/Catalog/Category/Product/Refresh.php +++ b/app/code/core/Enterprise/Catalog/Model/Index/Action/Catalog/Category/Product/Refresh.php @@ -326,7 +326,7 @@ class Enterprise_Catalog_Model_Index_Action_Catalog_Category_Product_Refresh ->setComment('Catalog Category Product Index Tmp'); $this->_connection->dropTable($this->_getMainTmpTable()); $this->_connection->createTable($table); $this->_connection->createTemporaryTable($table); + } /** 19. Other Use-Cases? Scheduler Queue processing Indexes Everything that’s batchable 20. Thank you! Any questions? My blog http://www.aoemedia.com http://www.fabrizio-branca.de @fbrnc Follow me on twitter!

1. Multithreaded
XML Import
…for Magento
San Francisco Magento Meetup Group - October 23, 2013

2. Fabrizio
Branca
Lead System Developer at

3. E-Commerce:
Magento
CMS:
TYPO3
Global
Enterprise
Projects
Portals:
ZF, FLOW,…
High
Performance
/Scale
Mobile
Searchperience:
SOLR
120 people
in 7 offices
world-wide

4. Aoe_Import
github.com/AOEmedia/Aoe_Import
git clone --recursive …

5. Will Aoe_Import be the fastest
product importer around?
YES, of course!
Well, maybe…
Actually, Aoe_Import is only a
XML Importer “Framework”. It’s
up to you to decide how to handle
the xml snippets…

6. for large XML files
XML! Not CSV.
full flexibility in
processor implementation
Aoe_Import
multi-thread support!
Subscribe your
“Processors” to xpaths
Stream processing
(XMLReader)
“event” driven

7. memory
single product
Problem
Memory limit
time

8. Memory limit
time
memory
memory
Trivial Solution
Memory limit
time

9. Beat the memory Leak
by forking
Waiting for other
thread to terminate
Threading
overhead
Process
import

10. Forking?
In PHP?
$pid = pcntl_fork();
if ($pid) {
// parent process runs what is here
echo "parentn";
} else {
// child process runs what is here
echo "childn";
}

11. Threadi
github.com/AOEmedia/Threadi

12. Clean OOP interface for PHP to
forking and process management
Threadi

13. Batch Processor
Collect a bunch of imports …
…fork…
…and process them in
a child process.

14. No imports are processed in the main thread.
So there’s no memory leak happing here
Main thread
memory
Memory limit
time
Create process
collection
Waiting for other thread to terminate
Threading Process imports in process collection
overhead
Forks
Every fork starts with the low
memory footprint of the main thread
Find the number of imports
that can be processed at a
time without hitting the memory limit

15. Multi-threading? Sure!
Number of
threads
processed
in parallel
Number of items in a batch

16. Problems?
Database Connection
Database
connection
doesn’t like to
be cloned!
Mage::getSingleton('core/resource')
->getConnection('core_write')
->closeConnection();

17. Problems?
Thread Safety

18. Problems?
Thread Safety
--- a/app/code/core/Enterprise/Catalog/Model/Index/Action/Catalog/Category/Product/Refresh.php
+++ b/app/code/core/Enterprise/Catalog/Model/Index/Action/Catalog/Category/Product/Refresh.php
@@ -326,7 +326,7 @@ class Enterprise_Catalog_Model_Index_Action_Catalog_Category_Product_Refresh
->setComment('Catalog Category Product Index Tmp');
$this->_connection->dropTable($this->_getMainTmpTable());
$this->_connection->createTable($table);
$this->_connection->createTemporaryTable($table);
+
}
/**

19. Other Use-Cases?
Scheduler
Queue processing
Indexes
Everything
that’s batchable

20. Thank you!
Any questions?
My blog
http://www.aoemedia.com
http://www.fabrizio-branca.de
@fbrnc
Follow me on twitter!