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simba
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rebuild empty partitions.

This commit is contained in:
hjp 2014-12-14 10:07:25 +00:00
parent cd48a38516
commit 99f174bd0d
1 changed files with 19 additions and 1 deletions
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20
scripts/remove_session
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@ -11,13 +11,15 @@ use Simba::CA;
use Bit::Vector::Judy;
use Getopt::Long;
$| = 1;
my $ca = Simba::CA->new({
dbi_file => $ENV{SIMBA_DB_CONN} || "$ENV{HOME}/.dbi/simba",
});
my $dbh = $ca->{dbh};
my $dbh = $ca->{dbh};
my $partition_size = $ca->{instances_part_size};
my %opt;
GetOptions(
@ -39,8 +41,24 @@ if ($opt{age}) {
}
for my $session (@ARGV) {
print "deleting instances of session $session\n";
my $old_min_id = $dbh->selectrow_array("select min(id) from instances");
my $n_instances = $dbh->do("delete from instances where session=?", {}, $session);
print "\t$n_instances instances deleted\n";
# Check if we just crossed into a new partition, if so, the old one is empty
# and should be shrunk to minimum size.
#
# Note: This will not shrink partitions if we delete a session somewhere
# in the middle, but I expect to do that rarely, and rebuilding a partition
# after expiring a single session isn't worthwhile anyway. If I delete lots
# of instances in the middle, I can always rebuild the affected partitions
# manually.
my $new_min_id = $dbh->selectrow_array("select min(id) from instances");
if (int($new_min_id/$partition_size) > int($old_min_id/$partition_size)) {
my $partition = sprintf("p%03d", int($new_min_id/$partition_size));
$dbh->do("alter table instances rebuild partition $partition");
print "\trebuilt partition $partition\n";
}
$dbh->commit();
}
remove_orphaned_sessions();