Bug #53987 Threshold for timerHandlingLab-warning is too low
Submitted: 26 May 2010 9:23 Modified: 12 Aug 2010 7:14
Reporter: Geert Vanderkelen Email Updates:
Status: Closed Impact on me:
None 
Category:MySQL Cluster: Cluster (NDB) storage engine Severity:S3 (Non-critical)
Version:mysql-5.1-telco-7.0 OS:Any
Assigned to: Jonas Oreland CPU Architecture:Any

[26 May 2010 9:23] Geert Vanderkelen 
Description:
Data nodes write a Warning message to their outlog when it is staling and time shifted: 

For example:
WARNING: timerHandlingLab now: 40487176200 sent: 40487176150 diff: 50
WARNING: timerHandlingLab now: 40500964820 sent: 40500964770 diff: 50

The above messages are handy to debug when problem occur, but they tend to flood the logs making people nervous.

How to repeat:
.

Suggested fix:
Put the threshold higher, instead of 50, set it to 1000 for a WARNING.
Maybe put a INFO for anything between 50 and 1000, or just don't print anything.

src/kernel/blocks/qmgr/QmgrMain.cpp

  if (TcurrentTime >= sent + 1000 || (TcurrentTime < sent))
  {
    jam();
    ndbout_c("WARNING: timerHandlingLab now: %llu sent: %llu diff: %d",
             TcurrentTime, sent, int(TcurrentTime - sent));
  }
[11 Aug 2010 7:17] Bugs System 
A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/commits/115452

3244 Jonas Oreland	2010-08-11
      ndb - bug#53987 - "improve" timehandling printouts
[11 Aug 2010 9:38] Bugs System 
Pushed into mysql-5.1-telco-6.3 5.1.47-ndb-6.3.36 (revid:jonas@mysql.com-20100811093036-c1h4p730hkrfy1kg) (version source revid:jonas@mysql.com-20100811071642-ifh0r7hnxf2qorrj) (merge vers: 5.1.47-ndb-6.3.36) (pib:20)
[11 Aug 2010 9:38] Bugs System 
Pushed into mysql-5.1-telco-7.0 5.1.47-ndb-7.0.17 (revid:jonas@mysql.com-20100811093545-3huy9nqun7g2yit7) (version source revid:jonas@mysql.com-20100811093430-i42i0auiuox2lwv3) (merge vers: 5.1.47-ndb-7.0.17) (pib:20)
[11 Aug 2010 9:45] Jonas Oreland 
pushed to 6.3.36, 7.0.17 and 7.1.6
[12 Aug 2010 7:14] Jon Stephens 
Documented bugfix in the NDB-6.3.36, 7.0.17, and 7.1.6 changelogs, as follows:

      An excessive number of timeout warnings (normally used only 
      for debugging) were written to the data node logs.

Closed.