Commit a550c7cf by Julien Muchembled

stress: add comments

1 parent f0d56734
......@@ -2,6 +2,17 @@
# implement another tool to stress an existing cluster, which would be filled
# by a real application.
# XXX: Killing storage nodes out of the control of the master
# (tools/stress -r RATIO with RATIO != 0) sometimes causes the cluster to
# become non-operational. The race condition is that by the time the
# master notices a node is killed, it may finish a transaction for which
# the client node got failures with the replica, which gets disconnected.
# The code tries to anticipate failures, by assuming a node is down until
# it is actually down and again running, but even after a single kill,
# long-running commits (e.g deadlock resolution) can cause several
# failures+resync in a row for the same node.
# The only solution looks like to not abort if it goes to RECOVERY.
import curses, os, random, re, select, threading, time
from collections import deque
from neo.lib import logging, protocol
......
......@@ -330,6 +330,7 @@ class Application(StressApplication):
def __init__(self, config):
dscpPatch(1)
StorageApplication__init__(self, config)
#StorageApplication.__init__ = __init__
if kill_mysqld:
from neo.scripts import neostorage
......
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