Bug #79457 Memory consumtion and request errors during table scan
Submitted: 30 Nov 2015 13:51
Reporter: Mike Pentagra Email Updates:
Status: Open Impact on me:
None 
Category:MySQL Cluster: NDB API Severity:S5 (Performance)
Version:7.4.7 OS:Oracle Linux
Assigned to: CPU Architecture:Any

[30 Nov 2015 13:51] Mike Pentagra 
Description:
We observe high memory consumption and, as a result of swapping due to high memory load, request errors on client side while doing table scan and parallel requests to another table within same transaction.
Table size - about 80k records.

How to repeat:
Scan table using NDB api, for each received data from scaned table request data by id from another table within one transaction.
Sample tables and code in attachments.
[30 Nov 2015 13:53] Mike Pentagra 
sample tables and some to reporoduce the problem

Attachment: tables.tar.bz2 (application/x-bzip2, text), 1.72 MiB.
[30 Nov 2015 13:53] Mike Pentagra 
sample tables and some to reporoduce the problem

Attachment: ndb_ty.cpp (application/octet-stream, text), 5.67 KiB.