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Improve visibility for distributed lock hanging

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This commit is contained in:
allegroai 2021-05-03 17:35:17 +03:00
parent 7f4ad0d1ca
commit 6411954002
1 changed files with 5 additions and 2 deletions
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7
apiserver/sync.py
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@ -1,3 +1,4 @@
import os
import time
from contextlib import contextmanager
from time import sleep
@ -18,10 +19,12 @@ def distributed_lock(name: str, timeout: int, max_wait: int = 0):
lock_name = f"dist_lock_{name}"
start = time.time()
max_wait = max_wait or timeout * 2
while not _redis.set(lock_name, value="", ex=timeout, nx=True):
pid = os.getpid()
while _redis.set(lock_name, value=pid, ex=timeout, nx=True) is None:
sleep(1)
if time.time() - start > max_wait:
raise Exception(f"Could not acquire {name} lock for {max_wait} seconds")
holder = _redis.get(lock_name)
raise Exception(f"Could not acquire {name} lock for {max_wait} seconds. The lock is hold by {holder}")
try:
yield
finally: