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sstablesplit_test.py
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sstablesplit_test.py
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from __future__ import division
import time
from math import floor
from os.path import getsize
from dtest import Tester, debug
class TestSSTableSplit(Tester):
def __init__(self, *args, **kwargs):
kwargs['cluster_options'] = {'start_rpc': 'true'}
Tester.__init__(self, *args, **kwargs)
def split_test(self):
"""
Check that after running compaction, sstablessplit can succesfully split
The resultant sstable. Check that split is reversable and that data is readable
after carrying out these operations.
"""
cluster = self.cluster
cluster.populate(1).start(wait_for_binary_proto=True)
node = cluster.nodelist()[0]
version = cluster.version()
debug("Run stress to insert data")
node.stress(['write', 'n=1000000', '-rate', 'threads=10'])
self._do_compaction(node)
self._do_split(node, version)
self._do_compaction(node)
self._do_split(node, version)
debug("Run stress to ensure data is readable")
node.stress(['read', 'n=1000000', '-rate', 'threads=25'])
def _do_compaction(self, node):
debug("Compact sstables.")
node.flush()
node.compact()
node.flush()
keyspace = 'keyspace1'
sstables = node.get_sstables(keyspace, '')
debug("Number of sstables after compaction: %s" % len(sstables))
def _do_split(self, node, version):
debug("Run sstablesplit")
time.sleep(5.0)
node.stop()
# default split size is 50MB
splitmaxsize = 10
expected_sstable_size = (10 * 1024 * 1024)
keyspace = 'keyspace1'
# get the initial sstables and their total size
origsstables = node.get_sstables(keyspace, '')
origsstable_size = sum([getsize(sstable) for sstable in origsstables])
debug("Original sstable and sizes before split: {}".format([(name, getsize(name)) for name in origsstables]))
# calculate the expected number of sstables post-split
expected_num_sstables = floor(origsstable_size / expected_sstable_size)
# split the sstables
result = node.run_sstablesplit(keyspace=keyspace, size=splitmaxsize,
no_snapshot=True, debug=True)
for (out, error, rc) in result:
debug("stdout: {}".format(out))
debug("stderr: {}".format(error))
debug("rc: {}".format(rc))
# get the sstables post-split and their total size
sstables = node.get_sstables(keyspace, '')
debug("Number of sstables after split: %s. expected %s" % (len(sstables), expected_num_sstables))
self.assertLessEqual(expected_num_sstables, len(sstables) + 1)
self.assertLessEqual(1, len(sstables))
# make sure none of the tables are bigger than the max expected size
sstable_sizes = [getsize(sstable) for sstable in sstables]
# add a bit extra for overhead
self.assertLessEqual(max(sstable_sizes), expected_sstable_size + 512)
# make sure node can start with changed sstables
node.start(wait_for_binary_proto=True)
def single_file_split_test(self):
"""
Covers CASSANDRA-8623
Check that sstablesplit doesn't crash when splitting a single sstable at the time.
"""
cluster = self.cluster
cluster.populate(1).start(wait_for_binary_proto=True)
node = cluster.nodelist()[0]
debug("Run stress to insert data")
node.stress(['write', 'n=2000000', '-rate', 'threads=10',
'-schema', 'compaction(strategy=LeveledCompactionStrategy, sstable_size_in_mb=10)'])
self._do_compaction(node)
node.stop()
result = node.run_sstablesplit(keyspace='keyspace1', size=2, no_snapshot=True)
for (stdout, stderr, rc) in result:
debug(stderr)
failure = stderr.find("java.lang.AssertionError: Data component is missing")
self.assertEqual(failure, -1, "Error during sstablesplit")