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6f6951d218
mysqlbinlog prints all row-based events of a single statement as a single "BINLOG" statement containing the concatenation of those events. Big (i.e. >64k) concatenations of row-based events (e.g. Write_rows_log_event) caused mysqlbinlog's IO_CACHE to overflow to a temporary file but the IO_CACHE had not been inited with open_cached_file(), so it tried to create a temporary file in an uninitialized directory (thus failing to create, then to write; some OS errors were printed, and it finally segfaulted). After fixing this, it appeared that mysqlbinlog was printing only a piece of big concatenations of row-based events (it printed at most the size of the IO_CACHE's buffer i.e. 64k); that caused data loss at restore. We fix and test that. Last, mysqlbinlog's printouts looked a bit strange with the informative header (#-prefixed) of groupped Rows_log_event all on one line, so we insert \n. After that, a small bug in the --hexdump code appeared (only if the string to hex-print had its length a multiple of 16), we fix it. client/mysqlbinlog.cc: if we write to IO_CACHE more than can fit into its memory buffer, it will try to overflow into a file; for that to work, IO_CACHE must be inited via open_cached_file(). mysql-test/r/mysqlbinlog_base64.result: result update mysql-test/t/mysqlbinlog_base64.test: test for BUG#25628: test that mysqlbinlog does not have OS errors with big concatenations of row-based events (e.g. Write_rows_log_event), and prints those concatenations entirely (testing by piping the output back into the server and comparing data). mysys/mf_iocache2.c: my_b_copy_to_file() had a problem: it assumed that bytes_in_cache are all the bytes to copy to the file, while it only tells how many bytes are in the buffer; so the code forgot to copy what had already overflown into a temporary file. Thus any big event was printed only partially by mysqlbinlog (loss of data at restore). The fix is inspired by MYSQL_BIN_LOG::write_cache(). sql/log_event.cc: Several Table_map/Write_rows events generated by one single statement get groupped together in mysqlbinlog's output; it printed things like #718 7:30:51 server id 12 end_log_pos 988 Write_rows: table id 17#718 7:30:51 server id 12 #718 7:30:51 server id 12 end_log_pos 988 Write_rows: table id 17#718 7:30:51 server id 12 end_log_pos 1413 <cut> It didn't look nice to have printouts glued like this without line breaks. Adding a line break. Doing this, when using --hexdump the result was: #718 7:30:51 server id 12 end_log_pos 988 # <hexdump output> # Write_rows: table id 17 which is correct; unfortunately if the hex dump had only full lines (i.e the string to print in hex had its length a multiple of 16), then the # in front of Write_rows was not printed. Fixed. sql/log_event.h: removing strcpy() (one less function call). If we write to IO_CACHE more than can fit into its memory buffer, it will try to overflow into a file; for that to work, IO_CACHE must be inited via open_cached_file(). open_cached_file(), like init_io_cache(), can fail; we make sure to catch this constructor's problem via the init_ok() method.
110 lines
1.4 KiB
Text
110 lines
1.4 KiB
Text
create table t1 (a int);
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insert into t1 values (1);
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insert into t1 values (2);
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insert into t1 values (3);
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update t1 set a=a+2 where a=2;
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update t1 set a=a+2 where a=3;
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create table t2 (word varchar(20));
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load data infile '../std_data_ln/words.dat' into table t2;
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flush logs;
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drop table t1;
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drop table t2;
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select * from t1;
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a
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1
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4
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5
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select * from t2;
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word
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Aarhus
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Aaron
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Ababa
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aback
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abaft
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abandon
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abandoned
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abandoning
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abandonment
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abandons
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Aarhus
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Aaron
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Ababa
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aback
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abaft
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abandon
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abandoned
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abandoning
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abandonment
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abandons
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abase
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abased
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abasement
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abasements
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abases
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abash
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abashed
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abashes
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abashing
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abasing
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abate
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abated
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abatement
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abatements
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abater
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abates
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abating
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Abba
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abbe
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abbey
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abbeys
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abbot
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abbots
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Abbott
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abbreviate
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abbreviated
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abbreviates
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abbreviating
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abbreviation
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abbreviations
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Abby
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abdomen
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abdomens
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abdominal
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abduct
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abducted
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abduction
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abductions
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abductor
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abductors
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abducts
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Abe
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abed
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Abel
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Abelian
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Abelson
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Aberdeen
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Abernathy
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aberrant
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aberration
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flush logs;
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drop table t2;
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create table t2 (word varchar(20));
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load data infile '../std_data_ln/words.dat' into table t2;
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insert into t2 select * from t2;
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insert into t2 select * from t2;
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insert into t2 select * from t2;
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insert into t2 select * from t2;
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insert into t2 select * from t2;
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insert into t2 select * from t2;
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insert into t2 select * from t2;
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insert into t2 select * from t2;
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insert into t2 select * from t2;
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select count(*) from t2;
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count(*)
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35840
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flush logs;
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select count(*) from t2;
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count(*)
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35840
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drop table t1;
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drop table t2;
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