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author | Davies Liu <davies.liu@gmail.com> | 2014-08-10 13:00:38 -0700 |
---|---|---|
committer | Josh Rosen <joshrosen@apache.org> | 2014-08-10 13:00:57 -0700 |
commit | 92daffed4c17e373a06333c85124075d0fd18f0c (patch) | |
tree | be807960c0529e2fa0f935e1d7d3d9ece8a21e78 | |
parent | bb23b118eb32db67779ff010fa33273e46b123f2 (diff) | |
download | spark-92daffed4c17e373a06333c85124075d0fd18f0c.tar.gz spark-92daffed4c17e373a06333c85124075d0fd18f0c.tar.bz2 spark-92daffed4c17e373a06333c85124075d0fd18f0c.zip |
[SPARK-2898] [PySpark] fix bugs in deamon.py
1. do not use signal handler for SIGCHILD, it's easy to cause deadlock
2. handle EINTR during accept()
3. pass errno into JVM
4. handle EAGAIN during fork()
Now, it can pass 50k tasks tests in 180 seconds.
Author: Davies Liu <davies.liu@gmail.com>
Closes #1842 from davies/qa and squashes the following commits:
f0ea451 [Davies Liu] fix lint
03a2e8c [Davies Liu] cleanup dead children every seconds
32cb829 [Davies Liu] fix lint
0cd0817 [Davies Liu] fix bugs in deamon.py
(cherry picked from commit 28dcbb531ae57dc50f15ad9df6c31022731669c9)
Signed-off-by: Josh Rosen <joshrosen@apache.org>
-rw-r--r-- | core/src/main/scala/org/apache/spark/api/python/PythonWorkerFactory.scala | 2 | ||||
-rw-r--r-- | python/pyspark/daemon.py | 78 |
2 files changed, 48 insertions, 32 deletions
diff --git a/core/src/main/scala/org/apache/spark/api/python/PythonWorkerFactory.scala b/core/src/main/scala/org/apache/spark/api/python/PythonWorkerFactory.scala index 7af260d0b7..bf716a8ab0 100644 --- a/core/src/main/scala/org/apache/spark/api/python/PythonWorkerFactory.scala +++ b/core/src/main/scala/org/apache/spark/api/python/PythonWorkerFactory.scala @@ -68,7 +68,7 @@ private[spark] class PythonWorkerFactory(pythonExec: String, envVars: Map[String val socket = new Socket(daemonHost, daemonPort) val pid = new DataInputStream(socket.getInputStream).readInt() if (pid < 0) { - throw new IllegalStateException("Python daemon failed to launch worker") + throw new IllegalStateException("Python daemon failed to launch worker with code " + pid) } daemonWorkers.put(socket, pid) socket diff --git a/python/pyspark/daemon.py b/python/pyspark/daemon.py index e73538baf0..22ab8d30c0 100644 --- a/python/pyspark/daemon.py +++ b/python/pyspark/daemon.py @@ -22,7 +22,8 @@ import select import socket import sys import traceback -from errno import EINTR, ECHILD +import time +from errno import EINTR, ECHILD, EAGAIN from socket import AF_INET, SOCK_STREAM, SOMAXCONN from signal import SIGHUP, SIGTERM, SIGCHLD, SIG_DFL, SIG_IGN from pyspark.worker import main as worker_main @@ -80,6 +81,17 @@ def worker(sock): os._exit(compute_real_exit_code(exit_code)) +# Cleanup zombie children +def cleanup_dead_children(): + try: + while True: + pid, _ = os.waitpid(0, os.WNOHANG) + if not pid: + break + except: + pass + + def manager(): # Create a new process group to corral our children os.setpgid(0, 0) @@ -102,29 +114,21 @@ def manager(): signal.signal(SIGTERM, handle_sigterm) # Gracefully exit on SIGTERM signal.signal(SIGHUP, SIG_IGN) # Don't die on SIGHUP - # Cleanup zombie children - def handle_sigchld(*args): - try: - pid, status = os.waitpid(0, os.WNOHANG) - if status != 0: - msg = "worker %s crashed abruptly with exit status %s" % (pid, status) - print >> sys.stderr, msg - except EnvironmentError as err: - if err.errno not in (ECHILD, EINTR): - raise - signal.signal(SIGCHLD, handle_sigchld) - # Initialization complete sys.stdout.close() try: while True: try: - ready_fds = select.select([0, listen_sock], [], [])[0] + ready_fds = select.select([0, listen_sock], [], [], 1)[0] except select.error as ex: if ex[0] == EINTR: continue else: raise + + # cleanup in signal handler will cause deadlock + cleanup_dead_children() + if 0 in ready_fds: try: worker_pid = read_int(sys.stdin) @@ -137,29 +141,41 @@ def manager(): pass # process already died if listen_sock in ready_fds: - sock, addr = listen_sock.accept() + try: + sock, _ = listen_sock.accept() + except OSError as e: + if e.errno == EINTR: + continue + raise + # Launch a worker process try: pid = os.fork() - if pid == 0: - listen_sock.close() - try: - worker(sock) - except: - traceback.print_exc() - os._exit(1) - else: - os._exit(0) + except OSError as e: + if e.errno in (EAGAIN, EINTR): + time.sleep(1) + pid = os.fork() # error here will shutdown daemon else: + outfile = sock.makefile('w') + write_int(e.errno, outfile) # Signal that the fork failed + outfile.flush() + outfile.close() sock.close() - - except OSError as e: - print >> sys.stderr, "Daemon failed to fork PySpark worker: %s" % e - outfile = os.fdopen(os.dup(sock.fileno()), "a+", 65536) - write_int(-1, outfile) # Signal that the fork failed - outfile.flush() - outfile.close() + continue + + if pid == 0: + # in child process + listen_sock.close() + try: + worker(sock) + except: + traceback.print_exc() + os._exit(1) + else: + os._exit(0) + else: sock.close() + finally: shutdown(1) |