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Diffstat (limited to 'cpp')
| -rw-r--r-- | cpp/README-HA.txt | 20 |
1 files changed, 13 insertions, 7 deletions
diff --git a/cpp/README-HA.txt b/cpp/README-HA.txt index 03e190a3fc..d93c99d8f3 100644 --- a/cpp/README-HA.txt +++ b/cpp/README-HA.txt @@ -4,13 +4,19 @@ Migrating to new HA =================== Up to version 0.20, Qpid provided the `cluster` module to support active-active -clustering for Qpid C++ brokers. In version 0.20 the `ha` module was introduced -supporting active-passive HA clustering. From version 0.22 the older `cluster` -module is no longer available so users will have to migrate to the new `ha` -module. - -This document summarizes the differences between the old and new HA modules and -the steps to migrate to new HA. It assumes you have read the +clustering for Qpid C++ brokers. There were some issues with this module. It +relied on synchronization of too much broker state, so that unrelated changes to +the broker often required additional work on the cluster. It also had a design +that could not take advantage of multiple CPUs - it was effectively single +threaded. + +In version 0.20 the `ha` module was introduced supporting active-passive HA +clustering that does not suffer these problems. From version 0.22 the older +`cluster` module is no longer available so users will have to migrate to the new +`ha` module. + +This note summarizes the differences between the old and new HA modules and the +steps to migrate to new HA. It assumes you have read the [HA chapter of the C++ Broker Book][chapter-ha] Client connections and fail-over |