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MDEV-34705: Binlog in Engine: Searchability for GTID position

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Every N bytes (hardcoded at 64k for now, to become a configurable setting),
write the binlog GTID state into the binlog tablespace. This allows to
quickly find a given GTID position by binary search to the prior GTID state
in the tablespace and then a small linear scan from that point.

The full binlog state is dumped at the start of the binlog file; remaining
states dumped are differential states containing only the changed
(domain_id, server_id) pairs, to save space if binlog space is large.

This commit only implements the writing of the binlog state to the
tablespace at regular intervals. The binary search to be implemented in a
subsequent commit.

Signed-off-by: Kristian Nielsen <knielsen@knielsen-hq.org>
This commit is contained in:
Kristian Nielsen
2024-10-03 18:39:55 +02:00
parent 0dd872e600
commit 18b9ec637e
7 changed files with 234 additions and 81 deletions
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4
sql/handler.h
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@@ -60,6 +60,7 @@ class Field_blob;
class Column_definition;
class select_result;
class handler_binlog_reader;
struct rpl_gtid;
// the following is for checking tables
@@ -1531,7 +1532,8 @@ struct handlerton
/* Optional implementation of binlog in the engine. */
bool (*binlog_init)(size_t binlog_size);
bool (*binlog_write_direct)(IO_CACHE *cache, size_t main_size);
bool (*binlog_write_direct)(IO_CACHE *cache, size_t main_size,
const rpl_gtid *gtid);
handler_binlog_reader * (*get_binlog_reader)();
/*