| 2011-11-08 13:15:48 |
Seppo Jaakola |
description |
Implement rolling schema upgrade support in mysql side.
Online schema upgrade (OSU) is a feature enabling schema changes while cluster is online. With this enhancement, the cluster will have two separate OSU methods:
* total order isolation (TOI)
* rolling schema upgrade (RSU)
A little bit of design:
1. A new option variable must be introduced to choose between TOI and RSU methods
2. DDL processing must switch between TOI and RSU methods
3. RSU method must call wsrep->desync() and wsrep->resync() before and after the DDL processing
4. RSU method should also set THD's wsrep_on to 0 during DDL phase, this is convenience for the caller |
Implement rolling schema upgrade support in mysql side.
Online schema upgrade (OSU) is a feature enabling schema changes while cluster is online. With this enhancement, the cluster will have two separate OSU methods:
* total order isolation (TOI)
* rolling schema upgrade (RSU)
A little bit of design:
1. A new option variable must be introduced to choose between TOI and RSU methods
2. DDL processing must switch between TOI and RSU methods
3. RSU method must call wsrep->desync() and wsrep->resync() before and after the DDL processing
4. RSU method should also set THD's wsrep_on to 0 during DDL phase, this is convenience for the caller
A sibling task: https://bugs.launchpad.net/codership-mysql/+bug/887564 implements functionality to dictate whole cluster in STATEMENT replication during the OSU process. This may turn out inevitable act. |
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