ceph/qa/workunits/rados/test_cache_pool.sh

#!/usr/bin/env bash

set -ex

expect_false()
{
	set -x
	if "$@"; then return 1; else return 0; fi
}

# create pools, set up tier relationship
ceph osd pool create base_pool 2
ceph osd pool application enable base_pool rados
ceph osd pool create partial_wrong 2
ceph osd pool create wrong_cache 2
ceph osd tier add base_pool partial_wrong
ceph osd tier add base_pool wrong_cache

# populate base_pool with some data
echo "foo" > foo.txt
echo "bar" > bar.txt
echo "baz" > baz.txt
rados -p base_pool put fooobj foo.txt
rados -p base_pool put barobj bar.txt
# fill in wrong_cache backwards so we can tell we read from it
rados -p wrong_cache put fooobj bar.txt
rados -p wrong_cache put barobj foo.txt
# partial_wrong gets barobj backwards so we can check promote and non-promote
rados -p partial_wrong put barobj foo.txt

# get the objects back before setting a caching pool
rados -p base_pool get fooobj tmp.txt
diff -q tmp.txt foo.txt
rados -p base_pool get barobj tmp.txt
diff -q tmp.txt bar.txt

# set up redirect and make sure we get backwards results
ceph osd tier set-overlay base_pool wrong_cache
ceph osd tier cache-mode wrong_cache writeback
rados -p base_pool get fooobj tmp.txt
diff -q tmp.txt bar.txt
rados -p base_pool get barobj tmp.txt
diff -q tmp.txt foo.txt

# switch cache pools and make sure we're doing promote
ceph osd tier remove-overlay base_pool
ceph osd tier set-overlay base_pool partial_wrong
ceph osd tier cache-mode partial_wrong writeback
rados -p base_pool get fooobj tmp.txt
diff -q tmp.txt foo.txt # hurray, it promoted!
rados -p base_pool get barobj tmp.txt
diff -q tmp.txt foo.txt # yep, we read partial_wrong's local object!

# try a nonexistent object and make sure we get an error
expect_false rados -p base_pool get bazobj tmp.txt

# drop the cache entirely and make sure contents are still the same
ceph osd tier remove-overlay base_pool
rados -p base_pool get fooobj tmp.txt
diff -q tmp.txt foo.txt
rados -p base_pool get barobj tmp.txt
diff -q tmp.txt bar.txt

# create an empty cache pool and make sure it has objects after reading
ceph osd pool create empty_cache 2

touch empty.txt
rados -p empty_cache ls > tmp.txt
diff -q tmp.txt empty.txt

ceph osd tier add base_pool empty_cache
ceph osd tier set-overlay base_pool empty_cache
ceph osd tier cache-mode empty_cache writeback
rados -p base_pool get fooobj tmp.txt
rados -p base_pool get barobj tmp.txt
expect_false rados -p base_pool get bazobj tmp.txt

rados -p empty_cache ls > tmp.txt
expect_false diff -q tmp.txt empty.txt

# cleanup
ceph osd tier remove-overlay base_pool
ceph osd tier remove base_pool wrong_cache
ceph osd tier remove base_pool partial_wrong
ceph osd tier remove base_pool empty_cache
ceph osd pool delete base_pool base_pool --yes-i-really-really-mean-it
ceph osd pool delete empty_cache empty_cache --yes-i-really-really-mean-it
ceph osd pool delete wrong_cache wrong_cache --yes-i-really-really-mean-it
ceph osd pool delete partial_wrong partial_wrong --yes-i-really-really-mean-it

## set of base, cache
ceph osd pool create base 8
ceph osd pool application enable base rados
ceph osd pool create cache 8

ceph osd tier add base cache
ceph osd tier cache-mode cache writeback
ceph osd tier set-overlay base cache

# cache-flush, cache-evict
rados -p base put foo /etc/passwd
expect_false rados -p base cache-evict foo
expect_false rados -p base cache-flush foo
expect_false rados -p cache cache-evict foo
rados -p cache cache-flush foo
rados -p cache cache-evict foo
rados -p cache ls - | wc -l | grep 0

# cache-try-flush, cache-evict
rados -p base put foo /etc/passwd
expect_false rados -p base cache-evict foo
expect_false rados -p base cache-flush foo
expect_false rados -p cache cache-evict foo
rados -p cache cache-try-flush foo
rados -p cache cache-evict foo
rados -p cache ls - | wc -l | grep 0

# cache-flush-evict-all
rados -p base put bar /etc/passwd
rados -p cache ls - | wc -l | grep 1
expect_false rados -p base cache-flush-evict-all
rados -p cache cache-flush-evict-all
rados -p cache ls - | wc -l | grep 0

# cache-try-flush-evict-all
rados -p base put bar /etc/passwd
rados -p cache ls - | wc -l | grep 1
expect_false rados -p base cache-flush-evict-all
rados -p cache cache-try-flush-evict-all
rados -p cache ls - | wc -l | grep 0

# cache flush/evit when clone objects exist
rados -p base put testclone /etc/passwd
rados -p cache ls - | wc -l | grep 1
ceph osd pool mksnap base snap
rados -p base put testclone /etc/hosts
rados -p cache cache-flush-evict-all
rados -p cache ls - | wc -l | grep 0

ceph osd tier cache-mode cache forward --yes-i-really-mean-it
rados -p base -s snap get testclone testclone.txt
diff -q testclone.txt /etc/passwd
rados -p base get testclone testclone.txt
diff -q testclone.txt /etc/hosts

# test --with-clones option
ceph osd tier cache-mode cache writeback
rados -p base put testclone2 /etc/passwd
rados -p cache ls - | wc -l | grep 1
ceph osd pool mksnap base snap1
rados -p base put testclone2 /etc/hosts
expect_false rados -p cache cache-flush testclone2
rados -p cache cache-flush testclone2 --with-clones
expect_false rados -p cache cache-evict testclone2
rados -p cache cache-evict testclone2 --with-clones
rados -p cache ls - | wc -l | grep 0

rados -p base -s snap1 get testclone2 testclone2.txt
diff -q testclone2.txt /etc/passwd
rados -p base get testclone2 testclone2.txt
diff -q testclone2.txt /etc/hosts

# cleanup
ceph osd tier remove-overlay base
ceph osd tier remove base cache

ceph osd pool delete cache cache --yes-i-really-really-mean-it
ceph osd pool delete base base --yes-i-really-really-mean-it

echo OK