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Lock master DICT against schema operations
Implementation
--------------
[ see comments in Dbdict.hpp ]
Use case: Node startup INR / NR
-------------------------------
Master DICT (like any block) keeps list of alive nodes (c_aliveNodes).
These are participants in schema ops.
(1) c_aliveNodes is initialized when DICT starts
in sp3 in READ_NODESCONF from CNTR
(2) when slave node fails (in any sp of the slave node)
it is removed from c_aliveNodes in NODE_FAILREP
(3) when slave starts, it is added to c_aliveNodes
in sp4 of the starting node in INCL_NODEREQ
Slave DIH locks master DICT in sp2 and releases the lock when started.
Based on the constraints:
- the lock is taken when master DICT is known
DIH reads this in sp2 in READ_NODESCONF
- the lock is taken before (3)
- the lock is taken before copying starts and held until it is done
in sp4 DIH meta, DICT meta, tuple data
- on INR in sp2 in START_PERMREQ the LCP info of the slave is erased
in all DIH in invalidateNodeLCP() - not safe under schema ops
Signals:
All but DICT_LOCK are standard v5.0 signals.
s=starting node, m=master, a=all participants, l=local block.
* sp2 - DICT_LOCK and START_PERM
DIH/s
DICT_LOCK_REQ
DICT/m
DICT_LOCK_CONF
DIH/s
START_PERMREQ
DIH/m
START_INFOREQ
DIH/a
invalidateNodeLCP() if INR
DIH/a
START_INFOCONF
DIH/m
START_PERMCONF
DIH/s
* sp4 - START_ME (copy metadata, no changes)
DIH/s
START_MEREQ
DIH/m
COPY_TABREQ
DIH/s
COPY_TABCONF
DIH/m
DICTSTARTREQ
DICT/s
GET_SCHEMA_INFOREQ
DICT/m
SCHEMA_INFO
DICT/s
DICTSTARTCONF
DIH/m
INCL_NODEREQ
DIH/a
INCL_NODEREQ
ANY/l
INCL_NODECONF
DIH/a
INCL_NODECONF
DIH/m
START_MECONF
DIH/s
* (copy data, omitted)
* SL_STARTED - release DICT lock
CNTR/s
NODE_START_REP
DIH/s
DICT_UNLOCK_ORD
DICT/m
# vim: set et sw=4:
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