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Fix race condition between replicate and replicate-check.

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This commit is contained in:
Daniel Nichter
2011-09-30 09:58:33 -06:00
parent b3cfd659b1
commit 830f855c05
2 changed files with 9 additions and 4 deletions
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11
bin/pt-table-checksum
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@@ -5734,8 +5734,13 @@ sub main {
);
}
# Requiring "AND master_crc IS NOT NULL" avoids a race condition
# when the system is fast but replication is slow. In such cases,
# we can select on the slave before the update for $update_sth
# replicates; this causes a false-positive diff.
my $sql = "SELECT MAX(chunk) FROM $repl_table "
. "WHERE db='$tbl->{db}' AND tbl='$tbl->{tbl}'";
. "WHERE db='$tbl->{db}' AND tbl='$tbl->{tbl}' "
. "AND master_crc IS NOT NULL";
MKDEBUG && _d($sql);
my $n_slaves = scalar @$slaves - 1;
@@ -6187,7 +6192,7 @@ sub create_repl_table {
my ($dbh, $repl_table, $o) = @args{@required_args};
MKDEBUG && _d('Creating --replicate table', $repl_table);
my $sql = $o->read_para_after(__FILE__, qr/MAGIC_create_replicate/);
$sql =~ s/CREATE TABLE checksum/CREATE TABLE $repl_table/;
$sql =~ s/CREATE TABLE checksums/CREATE TABLE $repl_table/;
$sql =~ s/;$//;
MKDEBUG && _d($dbh, $sql);
eval {
@@ -6893,7 +6898,7 @@ this_crc, master_crc, this_cnt, master_cnt. The table may be named anything you
wish. Here is a suggested table structure, which is automatically used for
L<"--create-replicate-table"> (MAGIC_create_replicate):
CREATE TABLE checksum (
CREATE TABLE checksums (
db char(64) NOT NULL,
tbl char(64) NOT NULL,
chunk int NOT NULL,

2
t/pt-table-checksum/samples/static-chunk-size-results-5.1.txt
View File

@@ -13,7 +13,7 @@ ERRORS DIFFS ROWS CHUNKS SKIPPED TABLE
0 0 6 1 0 mysql.proc
0 0 0 1 0 mysql.procs_priv
0 0 0 1 0 mysql.servers
0 1 0 1 0 mysql.tables_priv
0 0 0 1 0 mysql.tables_priv
0 0 0 1 0 mysql.time_zone
0 0 0 1 0 mysql.time_zone_leap_second
0 0 0 1 0 mysql.time_zone_name