[Samba] [Announce] CTDB 2.4 available for download

[Amitay Isaacs]

Changes in CTDB 2.4
===================

User-visible changes
--------------------

* A missing network interface now causes monitoring to fail and the
  node to become unhealthy.

* Changed ctdb command's default control timeout from 3s to 10s.

* debug-hung-script.sh now includes the output of "ctdb scriptstatus"
  to provide more information.

Important bug fixes
-------------------

* Starting CTDB daemon by running ctdbd directly should not remove
  existing unix socket unconditionally.

* ctdbd once again successfully kills client processes on releasing
  public IPs.  It was checking for them as tracked child processes
  and not finding them, so wasn't killing them.

* ctdbd_wrapper now exports CTDB_SOCKET so that child processes of
  ctdbd (such as uses of ctdb in eventscripts) use the correct socket.

* Always use Jenkins hash when creating volatile databases.  There
  were a few places where TDBs would be attached with the wrong flags.

* Vacuuming code fixes in CTDB 2.2 introduced bugs in the new code
  which led to header corruption for empty records.  This resulted
  in inconsistent headers on two nodes and a request for such a record
  keeps bouncing between nodes indefinitely and logs "High hopcount"
  messages in the log. This also caused performance degradation.

* ctdbd was losing log messages at shutdown because they weren't being
  given time to flush.  ctdbd now sleeps for a second during shutdown
  to allow time to flush log messages.

* Improved socket handling introduced in CTDB 2.2 caused ctdbd to
  process a large number of packets available on single FD before
  polling other FDs.  Use fixed size queue buffers to allow fair
  scheduling across multiple FDs.

Important internal changes
--------------------------

* A node that fails to take/release multiple IPs will only incur a
  single banning credit.  This makes a brief failure less likely to
  cause node to be banned.

* ctdb killtcp has been changed to read connections from stdin and
  10.interface now uses this feature to improve the time taken to kill
  connections.

* Improvements to hot records statistics in ctdb dbstatistics.

* Recovery daemon now assembles up-to-date node flags information
  from remote nodes before checking if any flags are inconsistent and
  forcing a recovery.

* ctdbd no longer creates multiple lock sub-processes for the same
  key.  This reduces the number of lock sub-processes substantially.

* Changed the nfsd RPC check failure policy to failover quickly
  instead of trying to repair a node first by restarting NFS.  Such
  restarts would often hang if the cause of the RPC check failure was
  the cluster filesystem or storage.

* Logging improvements relating to high hopcounts and sticky records.

* Make sure lower level tdb messages are logged correctly.

* CTDB commands disable/enable/stop/continue are now resilient to
  individual control failures and retry in case of failures.


Reporting bugs & Development Discussion
===============================


Please discuss this release on the samba-technical mailing list or by
joining the #ctdb IRC channel on irc.freenode.net.

All bug reports should be filed under CTDB product in the project's
Bugzilla database (https://bugzilla.samba.org/).


Download Details
=============

The source code can be downloaded from:

      http://ftp.samba.org/pub/ctdb/

Git repository

       git://git.samba.org/ctdb.git
       http://git.samba.org/?p=ctdb.git;a=summary  (Git via web)

CTDB documentation

        https://ctdb.samba.org/



Amitay.