Bug #45921 api/mysqld can after cluster restart reconnect with nodeid that is already used
Submitted: 2 Jul 2009 20:47 Modified: 7 Jul 2009 7:31
Reporter: Jonas Oreland Email Updates:
Status: Closed Impact on me:
Category:MySQL Cluster: Cluster (NDB) storage engine Severity:S3 (Non-critical)
Version: OS:Any
Assigned to: Jonas Oreland CPU Architecture:Any

[2 Jul 2009 20:47] Jonas Oreland
If a cluster is fully restararted,
an api/mysqld can try to reconnect with a node id
that might have been allocated by different api/mysqld
in this case, both will be partially connected with pain
and misery as a consequence.

work-around: don't use dynamic node ids

How to repeat:

Suggested fix:
the fix introduces a new config variable for the [mysqld] section "AutoReconnect"
which is set to false, forces api/mysqld to reconnect "fully", i.e by recreating the Ndb_cluster_connection.

The default value of the parameter is true, i.e old behaviour.

The fix also exposes a 2 methods on Ndb_cluster_connection
  void set_auto_reconnect(int value);
  int get_auto_reconnect() const;

If the set_auto_reconnect is used, it overrides value in config.
[2 Jul 2009 20:48] 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:


2994 Jonas Oreland	2009-07-02
      ndb - bug#45921 - add possibility to affect reconnect behaviour
[3 Jul 2009 21:40] Bugs System
Pushed into 5.1.35-ndb-7.0.7 (revid:jonas@mysql.com-20090703213649-xfj64gq7xcs7085h) (version source revid:jonas@mysql.com-20090703212226-m6117yn4xjv4rhsw) (merge vers: 5.1.35-ndb-7.0.7) (pib:11)
[4 Jul 2009 7:54] Jonas Oreland
also pushed into 6.3.26
[7 Jul 2009 7:31] Jon Stephens
Documented bugfix in the NDB-6.3.26 and 7.0.7 changelogs as follows:

    The AutoReconnect configuration parameter for API nodes (including 
    SQL nodes) has been added. This is intended to prevent API nodes 
    from re-using allocated node IDs during cluster restarts. For more 
    information, see

    This fix also introduces two new methods of the 
    Ndb_cluster_connection class in the NDB API. For more information, 
[7 Jul 2009 7:55] Jon Stephens
Commit with docs changes: http://lists.mysql.com/commits/78078
[9 Jul 2009 7:35] Bugs System
Pushed into 5.1.35-ndb-7.0.7 (revid:jonas@mysql.com-20090703213649-xfj64gq7xcs7085h) (version source revid:jonas@mysql.com-20090703212226-m6117yn4xjv4rhsw) (merge vers: 5.1.35-ndb-7.0.7) (pib:11)