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How can I change the value of NoOfFragmentLogFiles and FragmentLogFileSize
Posted by: Tony Sun
Date: July 22, 2016 09:56AM

Hi Gurus,

I have setup a mysql ndb cluster system on 2 nodes. I didn't set the two parameters "NoOfFragmentLogFiles" and "FragmentLogFileSize" in the config.ini file.

I created several disk data tables to save the usage of memory. However, when importing large amount of data into these disk data tables, I met the following error:

ERROR 1297 (HY000) at line 297883: Got temporary error 410 'REDO log files overloaded (decrease TimeBetweenLocalCheckpoints or increase NoOfFragmentLogFiles)' from NDBCLUSTER

I decreased the value of TimeBetweenLocalCheckpoints to 6 but it didn't work. So I was trying to change the value of NoOfFragmentLogFiles to a new bigger value. I read some articles that said it is better to change the value of "FragmentLogFileSize" as well.

I configured this two parameters in config.ini file and want to make them take effect. What I did is shutting down the two databases on the two nodes, and then shutdown the whole ndb cluster, and then restart the ndb_mgmd with --initial. When I was trying to start the ndbd on the two nodes, it failed and reported the following error in the log file:
-- Invalid file size for redo logfile, size only changable with --initial
-- Error handler shutting down system
-- Error handler shutdown completed - exiting
-- Node 2: Forced node shutdown completed. Occured during startphase 4. Caused by error 2350: 'Invalid configuration received from Management Server(Configuration error). Permanent error, external action needed'.

From my understanding, this means that I should use "ndbd --initial" to make the changes to take effect. However, if I do so, I may lose all my data that already in the ndb database.

I appreciate if somebody can give me some advice on how to do this.

Thanks,

Tony

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