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MySQL Cluster Manager 1.4.3 has been released
Posted by: Sreedhar S
Date: July 10, 2017 05:04AM

Dear MySQL Users,

MySQL Cluster Manager 1.4.3 has been released and can be downloaded
from the My Oracle Support (MOS) website. It will also be available
on Oracle Software Delivery Cloud at http://edelivery.oracle.com with
the next monthly update

MySQL Cluster Manager is an optional component of the MySQL Cluster Carrier
Grade Edition, providing a command-line interface that automates common
management tasks, including the following online operations:
 - Configuring and starting MySQL Cluster
 - Upgrades
 - Adding and removing cluster nodes
 - Adding and removing site hosts
 - Configuration changes
 - Backup and restore

MySQL Cluster Manager is a commercial extension to the MySQL family of products.
More details can be found at http://www.mysql.com/products/cluster/mcm/

A brief summary of changes in MySQL Cluster Manager version 1.4.3 is listed below:

Changes in MySQL Cluster Manager 1.4.3 (2017-07-10)

   This section documents all changes and bug fixes that have
   been applied in MySQL Cluster Manager 1.4.3 since the release
   of MySQL Cluster Manager version 1.4.2.

   Functionality Added or Changed

     * Agent: CPU usage during idle time for the mcmd agents has
       been significantly reduced. (Bug #26227736)

     * Agent: A new error code, Error 7030, has been created for
       failed ndb_mgmd commands and mysqld queries. (Bug
       #26160968)

     * Agent: Added support for the --skip-networking option for
       mysqld nodes, allowing mysqld nodes of a managed cluster
       to communicate with client applications using named pipes
       or shared memory on Windows platforms, and socket files
       on Unix-like platforms.
       Notice that, however, communication between mcmd agents
       and mcm clients using named pipes, shared memory, or
       socket files remain unsupported. (Bug #25992390, Bug
       #25974499)

     * Client: The start cluster --initial command now
       reinitializes the SQL nodes (if their data directories
       are empty) as well as the data nodes of an NDB Cluster. A
       new option, --skip-init, has been introduced, for
       specifying a comma-separated list of the SQL nodes for
       which reinitialization is to be skipped. (Bug #25856285,
       Bug #85713)

     * Client: Checksum verification has been added for all
       cluster reconfiguration plans created by the mcmd agents.
       Checksums for plans created locally are shared among all
       agents, and when the checksums do not match, the
       reconfiguration is aborted. This prevents agents from
       executing different plans. (Bug #23225839)

     * Files have been removed from the MySQL Cluster Manager +
       NDB Cluster bundled package, in order to reduce the
       package size significantly. (Bug #25916635)

   Bugs Fixed

     * Agent: When the list nextnodeid command was run against a
       cluster with the maximum number of nodes allowed, the
       mcmd agent quit unexpectedly. With this fix, the
       situation is properly handled. (Bug #26286531)

     * Agent: For a cluster with NoOfReplicas=1, trying to stop
       a data node with the stop process command would cause the
       agent to quit unexpectedly. (Bug #26259780)

     * Agent: When a data node was killed by an arbitrator in a
       situation of network partitioning, an mcmd failed to
       handle the exit report from the node and quit
       unexpectedly. It was due to a mishandling of the
       nodegroup information, which this fix corrects. (Bug
       #26192412)

     * Agent: A cluster could not be started if a relative path
       had been used for the --manager-directory option to set
       the location of the agent repository. (Bug #26172299)

     * Agent: When executing a user command, the mcmd agent
       could hang if the expected reply from another agent never
       arrived. This fix improves the timeout handling to avoid
       such hangs. (Bug #26168339)

     * Agent: While running the import config command, the mcmd
       agents that were present during the earlier dryrun for
       the import would become silent and then unavailable. This
       was due to some hostname resolution issues, which has
       been addressed by this fix. (Bug #26089906)

     * Agent: A collect log command sometimes failed at the
       middle with an ERROR 1003 Internal error: No clients
       connected. It was because the mcmd agent reset the copy
       completion marker prematurely; the behavior has been
       stopped by this fix. (Bug #26086958)

     * Agent: When the mcmd agents' clocks ran out of sync due
       to time drifts on virtual machines running Windows
       operations systems and then the clocks ran in sync again,
       communications among the agents failed. This fix prevents
       the problem by making the agents use a monotonic timer
       for their communication. (Bug #26084090)

     * Agent: The dropping or recreating of a node group that
       took place when adding data nodes could sometimes fail
       with an assertion error ("Polled nodegroup info is
       inconsistent"). This fix relaxes the assertion, which
       allows the node group reconfiguration to be completed.
       (Bug #26051753)
       References: See also: Bug #20104357.

     * Agent: During an execution of a set command, if no mysqld
       node is available for querying cluster information, an
       mcmd agent timed out while waiting for the "prepared"
       message from another agent, even after the message was
       already sent. This was due to the fact that the two
       agents had inconsistent plans of execution for the set
       command. This fix prevents the inconsistency. (Bug
       #26021616)
       References: This issue is a regression of: Bug #14230789,
       Bug #23148061.

     * Agent: A backup cluster --waitcompleted timed out
       sometimes right before the backup was completed when
       there were a lot of tables to be backed up. This was
       because the logical backup for the tables' metadata was
       taking too long in that case. With this fix, the mcmd
       agent is now sent progress reports of the logical backup,
       and the backup does not time out unless no more progress
       reports are received. (Bug #26000482)

     * Agent: When a set command involved a restart of data
       nodes of a cluster but one of the data nodes had been
       stopped, the set command failed with a timeout. With this
       fix, the set command is carried out successfully with a
       rolling restart for the data nodes. (Bug #25869325)

     * Agent: If a mysqld node was configured with the
       --skip-name-resolve option, attempts for mcmd to connect
       to the mysqld node would fail with the error message Host
       '127.0.0.1' is not allowed to connect to this MySQL
       server. This was because the MySQL account used by mcmd
       had 127.0.0.1 as its host name, which is not allowed when
       the --skip-name-resolve option is used with the mysqld
       node. This fix corrects the account host name to
       localhost. (Bug #25831764, Bug #85620)

     * Agent: When a host and its mcmd agent were restarted,
       mcmd might fail to restart a management or mysqld node on
       the host, and the show status command continuously
       returned the status of the node to be unknown. (Bug
       #25822822)

     * Agent: When an mcmd agent was in the process of shutting
       down, a user command issued then might cause the agent to
       quit unexpectedly. With this fix, an error message "Agent
       is shutting down" is returned, and the agent continues
       with its shutdown. (Bug #25055338)

     * Agent: When a set command involved a restart of data
       nodes of a cluster but one of the data nodes was in the
       failed state, mcmd restarted the data node, and then
       restarted it once more as part of a rolling restart,
       which was unnecessary. This fix eliminates the second
       restart. (Bug #23586651)

     * Client: After an agent was started and a few commands had
       been executed from the mcm client, the show settings
       command started returning the wrong value for the
       --log-level option. (Bug #26189795)

     * Client: Trying to set the mysqld node option
       --validate_password resulted in an error complaining that
       the parameter did not exist, even if the Password
       Validation Plugin
       (http://dev.mysql.com/doc/refman/5.6/en/validate-password
       -plugin.html) had already been installed on the mysqld
       node. It was due to some errors with the plug-in
       activation for mysqld nodes, which have now been
       corrected. (Bug #25797125)

On behalf of the Oracle MySQL RE Team

-Sreedhar S

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