diff options
Diffstat (limited to 'storage/ndb/src/kernel/blocks/dbutil/DbUtil.txt')
| -rw-r--r-- | storage/ndb/src/kernel/blocks/dbutil/DbUtil.txt | 68 |
1 files changed, 0 insertions, 68 deletions
diff --git a/storage/ndb/src/kernel/blocks/dbutil/DbUtil.txt b/storage/ndb/src/kernel/blocks/dbutil/DbUtil.txt deleted file mode 100644 index cc8c1985009..00000000000 --- a/storage/ndb/src/kernel/blocks/dbutil/DbUtil.txt +++ /dev/null @@ -1,68 +0,0 @@ -UTIL Protocols --------------- -Transactions are executed in two phases: -1) PREPARE -2) EXECUTE - - -PREPARE PHASE -------------- -1) ** REQUEST ** - Client (any block) requests prepare service from Util: - - Client --UTIL_PREPARE_REQ--> Util - ... - Client --UTIL_PREPARE_REQ--> Util - -2) ** DICTINFO ** - Util requests Dict for information about table: - - Util --GET_TABINFOREQ--> Dict - - Util <--DICTTABINFO-- Dict - ... - Util <--DICTTABINFO-- Dict - -3) ** PREPARE ** - Operation (= transaction) is prepared (DbUtil::prepareOperation) - - a) AttrMapping is created (a map used to read of the - actual execute request attribute values and put them in KEYINFO) - - b) TC Signal train is prepared - -4) ** CONFIRM ** - Request is confirmed - - Client <--UTIL_PREPARE_CONF-- Util - - -EXECUTE PHASE -------------- -1) Client (any block) requests execute service from Util: - (Execute can be INSERT, DELETE,...) - - Client --UTIL_EXECUTE_REQ--> Util (Multi-signals not yet implemented) - ... - Client --UTIL_EXECUTE_REQ--> Util - -2) Util --TCKEYREQ--> tc - - Util --KEYINFO--> tc (sometimes) (Not yet implemented) - ... - Util --KEYINFO--> tc - - Util --ATTRINFO--> tc (sometimes) - ... - Util --ATTRINFO--> tc - -3) Util <--TCKEYCONF-- tc - - Util --TC_COMMIT_ACK-->tc (sometimes) - - (in parallel with) - - Util <--TRANSID_AI-- tc (sometimes) - ... - Util <--TRANSID_AI-- tc - |