#!/usr/bin/perl

# Issue #260 is a terrible bug.

# In order to run this test:

# * checkout 1.4.15

# * change TAIL_REPAIR_TIME from (3 * 3600) to 3

# Now it should cause an assert. Patches can be tested to fix it.

use strict;

use Test::More;

use FindBin qw($Bin);

use lib "$Bin/lib";

use MemcachedTest;

plan skip_all => "Only possible to test #260 under artificial conditions";

exit 0;

plan tests => 11074;

# assuming max slab is 1M and default mem is 64M

my $server = new_memcached();

my $sock = $server->sock;

# create a big value for the largest slab

my $max = 1024 * 1024;

my $big = 'x' x (1024 * 1024 - 250);

ok(length($big) > 512 * 1024);

ok(length($big) < 1024 * 1024);

# set the big value

my $len = length($big);

print $sock "set big 0 0 $len\r\n$big\r\n";

is(scalar <$sock>, "STORED\r\n", "stored big");

mem_get_is($sock, "big", $big);

# no evictions yet

my $stats = mem_stats($sock);

is($stats->{"evictions"}, "0", "no evictions to start");

# set many big items, enough to get evictions

for (my $i = 0; $i < 100; $i++) {

  print $sock "set item_$i 0 0 $len\r\n$big\r\n";

  is(scalar <$sock>, "STORED\r\n", "stored item_$i");

}

# some evictions should have happened

my $stats = mem_stats($sock);

my $evictions = int($stats->{"evictions"});

ok($evictions == 37, "some evictions happened");

# the first big value should be gone

mem_get_is($sock, "big", undef);

# the earliest items should be gone too

for (my $i = 0; $i < $evictions - 1; $i++) {

  mem_get_is($sock, "item_$i", undef);

}

# check that the non-evicted are the right ones

for (my $i = $evictions - 1; $i < $evictions + 4; $i++) {

  mem_get_is($sock, "item_$i", $big);

}

# Now we fill a slab with incrementable items...

for (my $i = 0; $i < 10923; $i++) {

  print $sock "set sitem_$i 0 0 1\r\n1\r\n";

  is(scalar <$sock>, "STORED\r\n", "stored sitem_$i");

}

my $stats = mem_stats($sock);

my $evictions = int($stats->{"evictions"});

ok($evictions == 38, "one more eviction happened: $evictions");

# That evicted item was the first one we put in.

mem_get_is($sock, "sitem_0", undef);

sleep 15;

# Now we increment the item which should be on the tail.

# THIS asserts the memcached-debug binary.

print $sock "incr sitem_1 1\r\n";

is(scalar <$sock>, "2\r\n", "incremented to two");

#my $stats = mem_stats($sock, "slabs");

#is($stats->{"1:free_chunks"}, 0, "free chunks should still be 0");