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bitbake: hashserv: Fix diverging report race condition

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Fixes the hashequivalence server to resolve the diverging report race
error. This error occurs when the same task(hash) is run simultaneous on
two different builders, and then the results are reported back but the
hashes diverge (e.g. have different outhashes), and one outhash is
equivalent to a hash and another is not. If taskhash was not originally
in the database, the client will fallback to using the taskhash as the
suggested unihash and the server will see reports come in like:

    taskhash: A
    unihash: A
    outhash: B

    taskhash: C
    unihash: C
    outhash: B

    taskhash: C
    unihash: C
    outhash: D

Note that the second and third reports are the same taskhash, with
diverging outhashes.

Taskhash C should be equivalent to taskhash (and unihash) A because they
share an outhash B, but the server would not do this when tasks were
reported in the order shown.

It became clear while trying to fix this that single large table to
store all reported hashes was going to make these updates difficult
since updating the unihash of all entries would be complex and time
consuming. Instead, it makes more sense to split apart the database into
two tables: One that maps taskhashes to unihashes and one that maps
outhashes to taskhashes. This should hopefully improve the parsing query
times as well since they only care about the taskhashes to unihashes
table, at the cost of more complex INNER JOIN queries on the lesser used
API.

Note this change does delete existing hash equivlance data and starts a
new database table rather than converting existing data.

(Bitbake rev: dff5a17558e2476064e85f35bad1fd65fec23600)

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Joshua Watt 2021-10-07 14:32:00 -05:00 committed by Richard Purdie
parent ecb11a6848
commit c7c47bb0d2
4 changed files with 313 additions and 152 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

70
bitbake/lib/hashserv/__init__.py
View File

@ -22,46 +22,68 @@ ADDR_TYPE_TCP = 1
# is necessary
DEFAULT_MAX_CHUNK = 32 * 1024
TABLE_DEFINITION = (
("method", "TEXT NOT NULL"),
("outhash", "TEXT NOT NULL"),
("taskhash", "TEXT NOT NULL"),
("unihash", "TEXT NOT NULL"),
("created", "DATETIME"),
# Optional fields
("owner", "TEXT"),
("PN", "TEXT"),
("PV", "TEXT"),
("PR", "TEXT"),
("task", "TEXT"),
("outhash_siginfo", "TEXT"),
UNIHASH_TABLE_DEFINITION = (
("method", "TEXT NOT NULL", "UNIQUE"),
("taskhash", "TEXT NOT NULL", "UNIQUE"),
("unihash", "TEXT NOT NULL", ""),
)
TABLE_COLUMNS = tuple(name for name, _ in TABLE_DEFINITION)
UNIHASH_TABLE_COLUMNS = tuple(name for name, _, _ in UNIHASH_TABLE_DEFINITION)
OUTHASH_TABLE_DEFINITION = (
("method", "TEXT NOT NULL", "UNIQUE"),
("taskhash", "TEXT NOT NULL", "UNIQUE"),
("outhash", "TEXT NOT NULL", "UNIQUE"),
("created", "DATETIME", ""),
# Optional fields
("owner", "TEXT", ""),
("PN", "TEXT", ""),
("PV", "TEXT", ""),
("PR", "TEXT", ""),
("task", "TEXT", ""),
("outhash_siginfo", "TEXT", ""),
)
OUTHASH_TABLE_COLUMNS = tuple(name for name, _, _ in OUTHASH_TABLE_DEFINITION)
def _make_table(cursor, name, definition):
cursor.execute('''
CREATE TABLE IF NOT EXISTS {name} (
id INTEGER PRIMARY KEY AUTOINCREMENT,
{fields}
UNIQUE({unique})
)
'''.format(
name=name,
fields=" ".join("%s %s," % (name, typ) for name, typ, _ in definition),
unique=", ".join(name for name, _, flags in definition if "UNIQUE" in flags)
))
def setup_database(database, sync=True):
db = sqlite3.connect(database)
db.row_factory = sqlite3.Row
with closing(db.cursor()) as cursor:
cursor.execute('''
CREATE TABLE IF NOT EXISTS tasks_v2 (
id INTEGER PRIMARY KEY AUTOINCREMENT,
%s
UNIQUE(method, outhash, taskhash)
)
''' % " ".join("%s %s," % (name, typ) for name, typ in TABLE_DEFINITION))
_make_table(cursor, "unihashes_v2", UNIHASH_TABLE_DEFINITION)
_make_table(cursor, "outhashes_v2", OUTHASH_TABLE_DEFINITION)
cursor.execute('PRAGMA journal_mode = WAL')
cursor.execute('PRAGMA synchronous = %s' % ('NORMAL' if sync else 'OFF'))
# Drop old indexes
cursor.execute('DROP INDEX IF EXISTS taskhash_lookup')
cursor.execute('DROP INDEX IF EXISTS outhash_lookup')
cursor.execute('DROP INDEX IF EXISTS taskhash_lookup_v2')
cursor.execute('DROP INDEX IF EXISTS outhash_lookup_v2')
# TODO: Upgrade from tasks_v2?
cursor.execute('DROP TABLE IF EXISTS tasks_v2')
# Create new indexes
cursor.execute('CREATE INDEX IF NOT EXISTS taskhash_lookup_v2 ON tasks_v2 (method, taskhash, created)')
cursor.execute('CREATE INDEX IF NOT EXISTS outhash_lookup_v2 ON tasks_v2 (method, outhash)')
cursor.execute('CREATE INDEX IF NOT EXISTS taskhash_lookup_v3 ON unihashes_v2 (method, taskhash)')
cursor.execute('CREATE INDEX IF NOT EXISTS outhash_lookup_v3 ON outhashes_v2 (method, outhash)')
return db

1
bitbake/lib/hashserv/client.py
View File

@ -111,6 +111,7 @@ class Client(bb.asyncrpc.Client):
"report_unihash",
"report_unihash_equiv",
"get_taskhash",
"get_outhash",
"get_stats",
"reset_stats",
"backfill_wait",

334
bitbake/lib/hashserv/server.py
View File

@ -5,11 +5,12 @@
from contextlib import closing, contextmanager
from datetime import datetime
import enum
import asyncio
import logging
import math
import time
from . import create_async_client, TABLE_COLUMNS
from . import create_async_client, UNIHASH_TABLE_COLUMNS, OUTHASH_TABLE_COLUMNS
import bb.asyncrpc
@ -106,56 +107,64 @@ class Stats(object):
return {k: getattr(self, k) for k in ('num', 'total_time', 'max_time', 'average', 'stdev')}
def insert_task(cursor, data, ignore=False):
@enum.unique
class Resolve(enum.Enum):
FAIL = enum.auto()
IGNORE = enum.auto()
REPLACE = enum.auto()
def insert_table(cursor, table, data, on_conflict):
resolve = {
Resolve.FAIL: "",
Resolve.IGNORE: " OR IGNORE",
Resolve.REPLACE: " OR REPLACE",
}[on_conflict]
keys = sorted(data.keys())
query = '''INSERT%s INTO tasks_v2 (%s) VALUES (%s)''' % (
" OR IGNORE" if ignore else "",
', '.join(keys),
', '.join(':' + k for k in keys))
query = 'INSERT{resolve} INTO {table} ({fields}) VALUES({values})'.format(
resolve=resolve,
table=table,
fields=", ".join(keys),
values=", ".join(":" + k for k in keys),
)
prevrowid = cursor.lastrowid
cursor.execute(query, data)
logging.debug(
"Inserting %r into %s, %s",
data,
table,
on_conflict
)
return (cursor.lastrowid, cursor.lastrowid != prevrowid)
async def copy_from_upstream(client, db, method, taskhash):
d = await client.get_taskhash(method, taskhash, True)
def insert_unihash(cursor, data, on_conflict):
return insert_table(cursor, "unihashes_v2", data, on_conflict)
def insert_outhash(cursor, data, on_conflict):
return insert_table(cursor, "outhashes_v2", data, on_conflict)
async def copy_unihash_from_upstream(client, db, method, taskhash):
d = await client.get_taskhash(method, taskhash)
if d is not None:
# Filter out unknown columns
d = {k: v for k, v in d.items() if k in TABLE_COLUMNS}
with closing(db.cursor()) as cursor:
insert_task(cursor, d)
insert_unihash(
cursor,
{k: v for k, v in d.items() if k in UNIHASH_TABLE_COLUMNS},
Resolve.IGNORE,
)
db.commit()
return d
async def copy_outhash_from_upstream(client, db, method, outhash, taskhash):
d = await client.get_outhash(method, outhash, taskhash)
if d is not None:
# Filter out unknown columns
d = {k: v for k, v in d.items() if k in TABLE_COLUMNS}
with closing(db.cursor()) as cursor:
insert_task(cursor, d)
db.commit()
class ServerCursor(object):
def __init__(self, db, cursor, upstream):
self.db = db
self.cursor = cursor
self.upstream = upstream
return d
class ServerClient(bb.asyncrpc.AsyncServerConnection):
FAST_QUERY = 'SELECT taskhash, method, unihash FROM tasks_v2 WHERE method=:method AND taskhash=:taskhash ORDER BY created ASC LIMIT 1'
ALL_QUERY = 'SELECT * FROM tasks_v2 WHERE method=:method AND taskhash=:taskhash ORDER BY created ASC LIMIT 1'
OUTHASH_QUERY = '''
-- Find tasks with a matching outhash (that is, tasks that
-- are equivalent)
SELECT * FROM tasks_v2 WHERE method=:method AND outhash=:outhash
-- If there is an exact match on the taskhash, return it.
-- Otherwise return the oldest matching outhash of any
-- taskhash
ORDER BY CASE WHEN taskhash=:taskhash THEN 1 ELSE 2 END,
created ASC
-- Only return one row
LIMIT 1
'''
def __init__(self, reader, writer, db, request_stats, backfill_queue, upstream, read_only):
super().__init__(reader, writer, 'OEHASHEQUIV', logger)
self.db = db
@ -210,37 +219,103 @@ class ServerClient(bb.asyncrpc.AsyncServerConnection):
async def handle_get(self, request):
method = request['method']
taskhash = request['taskhash']
fetch_all = request.get('all', False)
if request.get('all', False):
row = self.query_equivalent(method, taskhash, self.ALL_QUERY)
else:
row = self.query_equivalent(method, taskhash, self.FAST_QUERY)
if row is not None:
logger.debug('Found equivalent task %s -> %s', (row['taskhash'], row['unihash']))
d = {k: row[k] for k in row.keys()}
elif self.upstream_client is not None:
d = await copy_from_upstream(self.upstream_client, self.db, method, taskhash)
else:
d = None
with closing(self.db.cursor()) as cursor:
d = await self.get_unihash(cursor, method, taskhash, fetch_all)
self.write_message(d)
async def handle_get_outhash(self, request):
with closing(self.db.cursor()) as cursor:
cursor.execute(self.OUTHASH_QUERY,
{k: request[k] for k in ('method', 'outhash', 'taskhash')})
async def get_unihash(self, cursor, method, taskhash, fetch_all=False):
d = None
if fetch_all:
cursor.execute(
'''
SELECT *, unihashes_v2.unihash AS unihash FROM outhashes_v2
INNER JOIN unihashes_v2 ON unihashes_v2.method=outhashes_v2.method AND unihashes_v2.taskhash=outhashes_v2.taskhash
WHERE outhashes_v2.method=:method AND outhashes_v2.taskhash=:taskhash
ORDER BY outhashes_v2.created ASC
LIMIT 1
''',
{
'method': method,
'taskhash': taskhash,
}
)
row = cursor.fetchone()
if row is not None:
logger.debug('Found equivalent outhash %s -> %s', (row['outhash'], row['unihash']))
d = {k: row[k] for k in row.keys()}
if row is not None:
d = {k: row[k] for k in row.keys()}
elif self.upstream_client is not None:
d = await self.upstream_client.get_taskhash(method, taskhash, True)
self.update_unified(cursor, d)
self.db.commit()
else:
d = None
row = self.query_equivalent(cursor, method, taskhash)
if row is not None:
d = {k: row[k] for k in row.keys()}
elif self.upstream_client is not None:
d = await self.upstream_client.get_taskhash(method, taskhash)
d = {k: v for k, v in d.items() if k in UNIHASH_TABLE_COLUMNS}
insert_unihash(cursor, d, Resolve.IGNORE)
self.db.commit()
return d
async def handle_get_outhash(self, request):
method = request['method']
outhash = request['outhash']
taskhash = request['taskhash']
with closing(self.db.cursor()) as cursor:
d = await self.get_outhash(cursor, method, outhash, taskhash)
self.write_message(d)
async def get_outhash(self, cursor, method, outhash, taskhash):
d = None
cursor.execute(
'''
SELECT *, unihashes_v2.unihash AS unihash FROM outhashes_v2
INNER JOIN unihashes_v2 ON unihashes_v2.method=outhashes_v2.method AND unihashes_v2.taskhash=outhashes_v2.taskhash
WHERE outhashes_v2.method=:method AND outhashes_v2.outhash=:outhash
ORDER BY outhashes_v2.created ASC
LIMIT 1
''',
{
'method': method,
'outhash': outhash,
}
)
row = cursor.fetchone()
if row is not None:
d = {k: row[k] for k in row.keys()}
elif self.upstream_client is not None:
d = await self.upstream_client.get_outhash(method, outhash, taskhash)
self.update_unified(cursor, d)
self.db.commit()
return d
def update_unified(self, cursor, data):
if data is None:
return
insert_unihash(
cursor,
{k: v for k, v in data.items() if k in UNIHASH_TABLE_COLUMNS},
Resolve.IGNORE
)
insert_outhash(
cursor,
{k: v for k, v in data.items() if k in OUTHASH_TABLE_COLUMNS},
Resolve.IGNORE
)
async def handle_get_stream(self, request):
self.write_message('ok')
@ -267,7 +342,12 @@ class ServerClient(bb.asyncrpc.AsyncServerConnection):
(method, taskhash) = l.split()
#logger.debug('Looking up %s %s' % (method, taskhash))
row = self.query_equivalent(method, taskhash, self.FAST_QUERY)
cursor = self.db.cursor()
try:
row = self.query_equivalent(cursor, method, taskhash)
finally:
cursor.close()
if row is not None:
msg = ('%s\n' % row['unihash']).encode('utf-8')
#logger.debug('Found equivalent task %s -> %s', (row['taskhash'], row['unihash']))
@ -294,55 +374,82 @@ class ServerClient(bb.asyncrpc.AsyncServerConnection):
async def handle_report(self, data):
with closing(self.db.cursor()) as cursor:
cursor.execute(self.OUTHASH_QUERY,
{k: data[k] for k in ('method', 'outhash', 'taskhash')})
outhash_data = {
'method': data['method'],
'outhash': data['outhash'],
'taskhash': data['taskhash'],
'created': datetime.now()
}
row = cursor.fetchone()
for k in ('owner', 'PN', 'PV', 'PR', 'task', 'outhash_siginfo'):
if k in data:
outhash_data[k] = data[k]
if row is None and self.upstream_client:
# Try upstream
row = await copy_outhash_from_upstream(self.upstream_client,
self.db,
data['method'],
data['outhash'],
data['taskhash'])
# Insert the new entry, unless it already exists
(rowid, inserted) = insert_outhash(cursor, outhash_data, Resolve.IGNORE)
if inserted:
# If this row is new, check if it is equivalent to another
# output hash
cursor.execute(
'''
SELECT outhashes_v2.taskhash AS taskhash, unihashes_v2.unihash AS unihash FROM outhashes_v2
INNER JOIN unihashes_v2 ON unihashes_v2.method=outhashes_v2.method AND unihashes_v2.taskhash=outhashes_v2.taskhash
-- Select any matching output hash except the one we just inserted
WHERE outhashes_v2.method=:method AND outhashes_v2.outhash=:outhash AND outhashes_v2.taskhash!=:taskhash
-- Pick the oldest hash
ORDER BY outhashes_v2.created ASC
LIMIT 1
''',
{
'method': data['method'],
'outhash': data['outhash'],
'taskhash': data['taskhash'],
}
)
row = cursor.fetchone()
# If no matching outhash was found, or one *was* found but it
# wasn't an exact match on the taskhash, a new entry for this
# taskhash should be added
if row is None or row['taskhash'] != data['taskhash']:
# If a row matching the outhash was found, the unihash for
# the new taskhash should be the same as that one.
# Otherwise the caller provided unihash is used.
unihash = data['unihash']
if row is not None:
# A matching output hash was found. Set our taskhash to the
# same unihash since they are equivalent
unihash = row['unihash']
resolve = Resolve.REPLACE
else:
# No matching output hash was found. This is probably the
# first outhash to be added.
unihash = data['unihash']
resolve = Resolve.IGNORE
insert_data = {
'method': data['method'],
'outhash': data['outhash'],
'taskhash': data['taskhash'],
'unihash': unihash,
'created': datetime.now()
}
# Query upstream to see if it has a unihash we can use
if self.upstream_client is not None:
upstream_data = await self.upstream_client.get_outhash(data['method'], data['outhash'], data['taskhash'])
if upstream_data is not None:
unihash = upstream_data['unihash']
for k in ('owner', 'PN', 'PV', 'PR', 'task', 'outhash_siginfo'):
if k in data:
insert_data[k] = data[k]
insert_task(cursor, insert_data)
self.db.commit()
insert_unihash(
cursor,
{
'method': data['method'],
'taskhash': data['taskhash'],
'unihash': unihash,
},
resolve
)
logger.info('Adding taskhash %s with unihash %s',
data['taskhash'], unihash)
d = {
'taskhash': data['taskhash'],
'method': data['method'],
'unihash': unihash
}
unihash_data = await self.get_unihash(cursor, data['method'], data['taskhash'])
if unihash_data is not None:
unihash = unihash_data['unihash']
else:
d = {k: row[k] for k in ('taskhash', 'method', 'unihash')}
unihash = data['unihash']
self.db.commit()
d = {
'taskhash': data['taskhash'],
'method': data['method'],
'unihash': unihash,
}
self.write_message(d)
@ -350,23 +457,16 @@ class ServerClient(bb.asyncrpc.AsyncServerConnection):
with closing(self.db.cursor()) as cursor:
insert_data = {
'method': data['method'],
'outhash': "",
'taskhash': data['taskhash'],
'unihash': data['unihash'],
'created': datetime.now()
}
for k in ('owner', 'PN', 'PV', 'PR', 'task', 'outhash_siginfo'):
if k in data:
insert_data[k] = data[k]
insert_task(cursor, insert_data, ignore=True)
insert_unihash(cursor, insert_data, Resolve.IGNORE)
self.db.commit()
# Fetch the unihash that will be reported for the taskhash. If the
# unihash matches, it means this row was inserted (or the mapping
# was already valid)
row = self.query_equivalent(data['method'], data['taskhash'], self.FAST_QUERY)
row = self.query_equivalent(cursor, data['method'], data['taskhash'])
if row['unihash'] == data['unihash']:
logger.info('Adding taskhash equivalence for %s with unihash %s',
@ -399,14 +499,16 @@ class ServerClient(bb.asyncrpc.AsyncServerConnection):
await self.backfill_queue.join()
self.write_message(d)
def query_equivalent(self, method, taskhash, query):
def query_equivalent(self, cursor, method, taskhash):
# This is part of the inner loop and must be as fast as possible
try:
cursor = self.db.cursor()
cursor.execute(query, {'method': method, 'taskhash': taskhash})
return cursor.fetchone()
except:
cursor.close()
cursor.execute(
'SELECT taskhash, method, unihash FROM unihashes_v2 WHERE method=:method AND taskhash=:taskhash',
{
'method': method,
'taskhash': taskhash,
}
)
return cursor.fetchone()
class Server(bb.asyncrpc.AsyncServer):
@ -435,7 +537,7 @@ class Server(bb.asyncrpc.AsyncServer):
self.backfill_queue.task_done()
break
method, taskhash = item
await copy_from_upstream(client, self.db, method, taskhash)
await copy_unihash_from_upstream(client, self.db, method, taskhash)
self.backfill_queue.task_done()
finally:
await client.close()

60
bitbake/lib/hashserv/tests.py
View File

@ -19,10 +19,10 @@ import time
import signal
def server_prefunc(server, idx):
logging.basicConfig(level=logging.DEBUG, filename='bbhashserv.log', filemode='w',
logging.basicConfig(level=logging.DEBUG, filename='bbhashserv-%d.log' % idx, filemode='w',
format='%(levelname)s %(filename)s:%(lineno)d %(message)s')
server.logger.debug("Running server %d" % idx)
sys.stdout = open('bbhashserv-%d.log' % idx, 'w')
sys.stdout = open('bbhashserv-stdout-%d.log' % idx, 'w')
sys.stderr = sys.stdout
class HashEquivalenceTestSetup(object):
@ -140,12 +140,17 @@ class HashEquivalenceCommonTests(object):
})
self.assertEqual(result['unihash'], unihash, 'Server returned bad unihash')
result = self.client.get_taskhash(self.METHOD, taskhash, True)
self.assertEqual(result['taskhash'], taskhash)
self.assertEqual(result['unihash'], unihash)
self.assertEqual(result['method'], self.METHOD)
self.assertEqual(result['outhash'], outhash)
self.assertEqual(result['outhash_siginfo'], siginfo)
result_unihash = self.client.get_taskhash(self.METHOD, taskhash, True)
self.assertEqual(result_unihash['taskhash'], taskhash)
self.assertEqual(result_unihash['unihash'], unihash)
self.assertEqual(result_unihash['method'], self.METHOD)
result_outhash = self.client.get_outhash(self.METHOD, outhash, taskhash)
self.assertEqual(result_outhash['taskhash'], taskhash)
self.assertEqual(result_outhash['method'], self.METHOD)
self.assertEqual(result_outhash['unihash'], unihash)
self.assertEqual(result_outhash['outhash'], outhash)
self.assertEqual(result_outhash['outhash_siginfo'], siginfo)
def test_stress(self):
def query_server(failures):
@ -260,6 +265,39 @@ class HashEquivalenceCommonTests(object):
result = down_client.report_unihash(taskhash6, self.METHOD, outhash5, unihash6)
self.assertEqual(result['unihash'], unihash5, 'Server failed to copy unihash from upstream')
# Tests read through from server with
taskhash7 = '9d81d76242cc7cfaf7bf74b94b9cd2e29324ed74'
outhash7 = '8470d56547eea6236d7c81a644ce74670ca0bbda998e13c629ef6bb3f0d60b69'
unihash7 = '05d2a63c81e32f0a36542ca677e8ad852365c538'
self.client.report_unihash(taskhash7, self.METHOD, outhash7, unihash7)
result = down_client.get_taskhash(self.METHOD, taskhash7, True)
self.assertEqual(result['unihash'], unihash7, 'Server failed to copy unihash from upstream')
self.assertEqual(result['outhash'], outhash7, 'Server failed to copy unihash from upstream')
self.assertEqual(result['taskhash'], taskhash7, 'Server failed to copy unihash from upstream')
self.assertEqual(result['method'], self.METHOD)
taskhash8 = '86978a4c8c71b9b487330b0152aade10c1ee58aa'
outhash8 = 'ca8c128e9d9e4a28ef24d0508aa20b5cf880604eacd8f65c0e366f7e0cc5fbcf'
unihash8 = 'd8bcf25369d40590ad7d08c84d538982f2023e01'
self.client.report_unihash(taskhash8, self.METHOD, outhash8, unihash8)
result = down_client.get_outhash(self.METHOD, outhash8, taskhash8)
self.assertEqual(result['unihash'], unihash8, 'Server failed to copy unihash from upstream')
self.assertEqual(result['outhash'], outhash8, 'Server failed to copy unihash from upstream')
self.assertEqual(result['taskhash'], taskhash8, 'Server failed to copy unihash from upstream')
self.assertEqual(result['method'], self.METHOD)
taskhash9 = 'ae6339531895ddf5b67e663e6a374ad8ec71d81c'
outhash9 = 'afc78172c81880ae10a1fec994b5b4ee33d196a001a1b66212a15ebe573e00b5'
unihash9 = '6662e699d6e3d894b24408ff9a4031ef9b038ee8'
self.client.report_unihash(taskhash9, self.METHOD, outhash9, unihash9)
result = down_client.get_taskhash(self.METHOD, taskhash9, False)
self.assertEqual(result['unihash'], unihash9, 'Server failed to copy unihash from upstream')
self.assertEqual(result['taskhash'], taskhash9, 'Server failed to copy unihash from upstream')
self.assertEqual(result['method'], self.METHOD)
def test_ro_server(self):
(ro_client, ro_server) = self.start_server(dbpath=self.server.dbpath, read_only=True)
@ -287,10 +325,8 @@ class HashEquivalenceCommonTests(object):
def test_slow_server_start(self):
"""
Ensures that the server will exit correctly even if it gets a SIGTERM
before entering the main loop
"""
# Ensures that the server will exit correctly even if it gets a SIGTERM
# before entering the main loop
event = multiprocessing.Event()