CMON crash after CREATE LOGFILE GROUP

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Chris B.

• February 22, 2012 09:23

Hello together,

i've just had another problem with cmon when i'm going to create a new "logfile group" to enable tablespace-based datadisks.
I have tried it with the following commands which were described in the blog (http://johanandersson.blogspot.com/2008/12/disk-data-summary.html):

mysql> CREATE LOGFILE GROUP lg ADD UNDOFILE 'undo1.dat' INITIAL_SIZE=3221225472 UNDO_BUFFER_SIZE=134217728 ENGINE=NDB;
Query OK, 0 rows affected (19.24 sec)

mysql> CREATE TABLESPACE ts_1 ADD DATAFILE 'data1.dat' USE LOGFILE GROUP lg INITIAL_SIZE=3221225472 ENGINE=NDB;
Query OK, 0 rows affected (18.73 sec)

After the first command, cmon is crashing with no logentry, but with an segmentation-fault:

 

->/var/log/messages
Feb 22 09:01:14 testserver1 kernel: [1968933.929745] cmon[15381]: segfault at 0 ip 00000000004fe360 sp 00007f5c6b7f08d8 error 4 in cmon[400000+27b000]

When i try to start it again it run 1 minute and than it is crashed again.

Did anybody know this issue and how to fix this?!

BR
Chris

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  Johan

  • February 23, 2012 11:33

  hi,

  will try tor reproduce this and let you know here.

  
  Thank you!

   

  -Johan

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  Johan

  • February 23, 2012 21:16

  Hi,

  I have fixed this bug (an uninitialized ndb cluster connection). I will make a new release tomorrow (CMON 1.1.21).

  Thank you for the excellent report.

  BR

  johan

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  Chris B.

  • February 24, 2012 08:53

  Hi,

  that sounds very good and i'm intent to test it! May be today otherwise on monday!

  No Problem :)
  Have a nice weekend!

  Chris

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  Johan

  • February 24, 2012 22:21

  Hi Chris,

  Sorry for the late reply, but CMON 1.1.21 is now available for download.

  Binary tarball:

  wget http://www.severalnines.com/downloads/cmon/cmon-1.1.21-64bit-glibc23-mc70.tar.gz

  RPMs:

  wget http://www.severalnines.com/downloads/cmon/cmon-agent-1.1.21-1.x86_64.rpm

  wget http://www.severalnines.com/downloads/cmon/cmon-controller-1.1.21-1.x86_64.rpm

  wget http://www.severalnines.com/downloads/cmon/cmon-www-1.1.21-1.noarch.rpm

  Schema files:

  wget http://www.severalnines.com/downloads/cmon/cmon_db-1.1.21.sql

  wget http://www.severalnines.com/downloads/cmon/cmon_data-1.1.21.sql

  If you are on version say 1.1.17 then you should also download:

  wget http://www.severalnines.com/downloads/cmon/cmon_db_mods-1.1.17-1.1.18.sql

  wget http://www.severalnines.com/downloads/cmon/cmon_db_mods-1.1.19-1.1.20.sql

  (there are no mods files between 1.1.18 --> 1.1.19 and 1.1.20 --> 1.1.21)

  You really only have to upgrade the Controller node,  and you would like to install the www files.

  Do:

  mysql -ucmon -p cmon < cmon_db_mods-1.1.x-1.1.y.sql

  mysql -ucmon -p  cmon < cmon_db-1.1.21.sql

  mysql -ucmon -p  cmon< cmon_data-1.1.21.sql

  restart with  the new cmon version.

  Let me know if you run into any troubles.

  Thank you and have a nice weekend.

  BR

  johan

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  Chris B.

  • February 28, 2012 10:45

  Hi Johan,

  thanks for fixing this!
  I have updated cmon itself (without sql-executions, because i was on 1.1.20 before) and the www-files.
  After that the error doesn't occure anymore ;)
  But now i have a question:
  I have created a 5GB TS, but cmon shows me a 10GB TS in the rrdgraphs as though i think cmon is summarizing all TS on every node.
  This can already observed on DM- and IM-Graphs. Is this a bug or a feature? If it's a feature what is the benefit of summarizing this data?

  
  Thank you very much!

  
  BR
  Chris
  
  

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  Johan

  • February 28, 2012 20:14

  Hi Chris,

  Need to think whether bug or feature.

  The calculation could be improved:

  Total_storage =  DataMemory (of one node) x  N (number of data nodes) / 2 (NoOfReplicas) 
   
  DataMemory can also be IndexMemory and TableSpace.

  I will get back on this one.

  Thank you,

  johan 

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