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I'm trying to migrate from Magento 1 to 2 and when I get to this part:

[2017-10-06 14:04:36][INFO][mode: data][stage: data migration][step: Map Step]: started 33% [=========>------------------] Remaining Time: 3 mins

I then get this error

[PDOException]
SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '0' for key 'PRIMARY'

Any ideas?

  • did you try to delete this record from that particular table ? if not then do this after take database backup then perform. – Hardik Visa Sep 11 at 16:35
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The problem should go away if you change bulk_size to something other than 0 in your config.xml. It doesn't seem to auto-detect correctly on the customer_group table. Setting mine to 100 solved the problem for me.

To find out what table is the problem, try adding some debugging info to your src/Migration/Step/Map/Data.php file. Something like $this->logger->info("DEBUG: " . $sourceDocName ); around line 136. This should output the table the migration tool is currently working on in the console.

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I am getting the same error. When doing the migration with verbose mode on, I can see that the issue is with the "customer_group" table. Primary key 0 is the "NOT LOGGED IN" customer group.

That is how far I am into for now. I will let you know if I find anything else.

  • How do you know which table is causing the issue? – Fred Oct 9 '17 at 8:21
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I had the same problem.. to get past it at least temporarily, I added this to the map.xml file under source and under document_rules

 <ignore>
    <document>customer_group</document>
 </ignore>

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