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Added support for automatic disconnect when a dynamic cluster node is shut down

When the dynamic cluster configuration has scale for certain

occasions, it makes sense to provide down scaling support when these

occasions are over, which does not rely on the configured cluster

disconnect timeout (ClusterAutodeleteInterval). The new code will send

automatically a disconnect request when a dynamic cluster node is

terminating gracefully.

Depending on the configuration, a new version of NaviServer will be

necessary to reliably execute disconnect requests. Appropriate changes

are in the NaviServer release/4.99 and main branches.

- Bumped version numbers:

* acs-tcl to 5.10.1b4

* acs-admin to 5.10.1b4

  1. … 4 more files in changeset.
Adding auto-deletion of dynamic cluster nodes and small refactoring

- New kernel parameter "ClusterAutodeleteInterval" to specify, when a

dynamic cluster node is not regarded as temporarily unavailable but

as definitely gone. The default value for this parameter is 2m (2

minutes).

- small refactoring to reduce duplicated logic

- Bumped version numbers:

* acs-kernel to 5.10.1b4

* acs-tcl to 5.10.1b3

* acs-admin to 5.10.1b3

  1. … 5 more files in changeset.
Small update for cluster support

- Improved visualization of cluster nodes that we lost contact to

- New kernel parameters to reduce hard-coded values and to make purpose more explicit

* new parameter ClusterHeartbeatInterval (default 20s),

was hardcoded before to the new default value

* renamed PreferredLocationRegexp -> ClusterPreferredLocationRegexp

* renamed EnableLoggingP -> ClusterEnableLoggingP

- Bumped version numbers:

* acs-kernel to 5.10.1b3

* acs-tcl to 5.10.1b2

* acs-admin to 5.10.1b2

acs-kernel acs-admin acs-tcl/

  1. … 7 more files in changeset.
file cluster.tcl was initially added on branch oacs-5-10.

cluster reform: added admin page and minor updates

  1. … 5 more files in changeset.