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Bug
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Resolution: Done
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Major
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1.2.0.Final
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None
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connection.execute("INSERT INTO tableb (id, colb) values (1,'1')");
connection.execute("INSERT INTO tableb (id, colb) values (2,'2')");
connection.execute("INSERT INTO tableb (id, colb) values (3,'3')");
connection.execute("INSERT INTO tableb (id, colb) values (4,'4')");
connection.execute("INSERT INTO tableb (id, colb) values (5,'5')");
connection.execute("UPDATE tableb set id = colb + 300");
connection.execute("UPDATE tableb set id = colb + 300");select CONVERT(VARCHAR(1000), [__$start_lsn], 2) as start_lsn, CONVERT(VARCHAR(1000), [__$seqval], 2) as seqval, [__$operation],[__$command_id],id,colb from testDb.cdc.dbo_tableb_CT
commit offset and restart connector on 19th row.
after starting connector it will skip not processed records: 21, 22, 23connection.execute("INSERT INTO tableb (id, colb) values (1,'1')"); connection.execute("INSERT INTO tableb (id, colb) values (2,'2')"); connection.execute("INSERT INTO tableb (id, colb) values (3,'3')"); connection.execute("INSERT INTO tableb (id, colb) values (4,'4')"); connection.execute("INSERT INTO tableb (id, colb) values (5,'5')"); connection.execute("UPDATE tableb set id = colb + 300"); connection.execute("UPDATE tableb set id = colb + 300"); select CONVERT(VARCHAR(1000), [__$start_lsn], 2) as start_lsn, CONVERT(VARCHAR(1000), [__$seqval], 2) as seqval, [__$operation],[__$command_id],id,colb from testDb.cdc.dbo_tableb_CT commit offset and restart connector on 19th row. after starting connector it will skip not processed records: 21, 22, 23
This Bug is the same as DBZ-1152
Sometimes during update of multiple primary keys order of change_lsn is not monotonic.
Basically, fix for above issue works only for one record with ChangePosition equal to commited offset
It seems, that event_serial_no should be calculated on common start_lsn not only on records with duplicated change_lsns
I will create PR with tests to reproduce
Also I have a solution in mind which does not require changes in implementation of event_serial_no
