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MDEV-16372 ER_BASE64_DECODE_ERROR upon replaying binary log via mysqlbinlog --verbose

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(This commit is for 10.3 and upper branches)

In case of a pattern of non-STMT_END-marked Rows-log-event (A) followed by
a STMT_END marked one (B) mysqlbinlog mixes up the base64 encoded rows events
with their pseudo sql representation produced by the verbose option:
      BINLOG '
        base64 encoded data for A
        ### verbose section for A
        base64 encoded data for B
        ### verbose section for B
      '/*!*/;
In effect the produced BINLOG '...' query is not valid and is rejected with the error.
Examples of this way malformed BINLOG could have been found in binlog_row_annotate.result
that gets corrected with the patch.

The issue is fixed with introduction an auxiliary IO_CACHE to hold on the verbose
comments until the terminal STMT_END event is found. The new cache is emptied
out after two pre-existing ones are done at that time.
The correctly produced output now for the above case is as the following:
      BINLOG '
        base64 encoded data for A
        base64 encoded data for B
      '/*!*/;
        ### verbose section for A
        ### verbose section for B

Thanks to Alexey Midenkov for the problem recognition and attempt to tackle,
and to Venkatesh Duggirala who produced a patch for the upstream whose
idea is exploited here, as well as to MDEV-23077 reporter LukeXwang who
also contributed a piece of a patch aiming at this issue.
This commit is contained in:
Andrei Elkin
2020-08-11 21:45:09 +03:00
parent 6a042281bd
commit caa35f8e25
10 changed files with 88 additions and 51 deletions
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1
mysql-test/suite/binlog_encryption/binlog_row_annotate.result
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@ -456,7 +456,6 @@ START TRANSACTION
### DELETE FROM `test1`.`t1`
### WHERE
### @1=3 /* INT meta=0 nullable=1 is_null=0 */
'/*!*/;
# at #
#010909 4:46:40 server id # end_log_pos # Query thread_id=# exec_time=# error_code=0
SET TIMESTAMP=1000000000/*!*/;