multithreaded xml import (san francisco magento meetup)
DESCRIPTION
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!TRANSCRIPT
XML Import Multithreaded
…for Magento
San Francisco Magento Meetup Group - October 23, 2013
Fabrizio Branca Lead System Developer at
E-Commerce: Magento
CMS: TYPO3
Portals: ZF, FLOW,…
Mobile Searchperience: SOLR
120 people in 7 offices world-wide
High Performance
/Scale
Global Enterprise Projects
Aoe_Import github.com/AOEmedia/Aoe_Import
git clone --recursive …
YES, of course!
Well, maybe…
Will Aoe_Import be the fastest product importer around?
Actually, Aoe_Import is only a XML Importer “Framework”. It’s
up to you to decide how to handle the xml snippets…
Aoe_Import
XML! Not CSV.
for large XML files
full flexibility in processor implementation
Stream processing (XMLReader)
“event” driven Subscribe your
“Processors” to xpaths
multi-thread support!
Problem
Memory limit
mem
ory
time
single product
Trivial Solution
Memory limit
mem
ory
time
Memory limit
mem
ory
time
Beat the memory Leak by forking
Waiting for other
thread to terminate
Threading
overhead
Process
import
Forking? In PHP?
$pid = pcntl_fork(); if ($pid) { // parent process runs what is here echo "parent\n"; } else { // child process runs what is here echo "child\n"; }
Threadi github.com/AOEmedia/Threadi
Threadi
Clean OOP interface for PHP to forking and process management
Batch Processor Collect a bunch of imports …
…fork… …and process them in
a child process.
Waiting for other thread to terminate
Threading
overhead
Process imports in process collection
Create process
collection
Memory limit
mem
ory
time
Main thread
Forks
No imports are processed in the main thread.
So there’s no memory leak happing here
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
Multi-threading? Sure!
Number of items in a batch
Number of
threads
processed
in parallel
Problems? Database Connection
Mage::getSingleton('core/resource') ->getConnection('core_write') ->closeConnection();
Database connection
doesn’t like to be cloned!
Problems? Thread Safety
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); } /**
Other Use-Cases?
Queue processing
Scheduler
Indexes
Everything that’s batchable
Thank you! Any questions?
http://www.aoemedia.com
http://www.fabrizio-branca.de
@fbrnc Follow me on twitter!
My blog