Web应用程序在运行密集任务时关闭-Openhift

Question

我遇到与此相关的问题：Web app shuts down (502 error) while running a intensive task。 下面是代码

您可以直接与尾这个应用程序： 的ssh -t 577d56787628e1406200010c@mainserver-bizcentral.rhcloud.com '尾巴 /日志/*' /var/lib/gems/2.3。 0/gems/net-ssh-3.2.0/lib/net/ssh/ruby​​_compat.rb：25：在select': closed stream (IOError) from /var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/ruby_compat.rb:25:in io_select' from /var/lib/gems/2.3.0/gems/net-ssh-3.2.0 /lib/net/ssh/transport/packet_stream.rb:75:in available_for_read?' from /var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/transport/packet_stream.rb:87:in next_packet' from /var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/transport/ session.rb：193：来自/var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/transport/session.rb:188的block in poll_message' from /var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/transport/session.rb:188:in循环' ：在poll_message' from /var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/connection/session.rb:474:in dispatch_incoming_packets' from /var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/connection/session.rb:225:in preprocess' from /var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/connection/session.rb:206:in process' from/var /lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/connection/session.rb:170:in block in loop' from /var/lib/gems/2.3.0/gems/net-ssh-3.2.0/lib/net/ssh/connection/session.rb:170:in loop' from /var/lib/gems/2.3.0/ gems/net-ssh-3.2.0/lib/net/ssh/connection/session.rb：170：从012/012/16/.0/lib/net/ssh.rb：240：在start' from /var/lib/gems/2.3.0/gems/rhc-1.38.7/lib/rhc/ssh_helpers.rb:173:in ssh_ruby' from /var/lib/gems/2.3.0/gems/rhc-1.38.7/lib/rhc/commands/tail.rb:40：在tail' from /var/lib/gems/2.3.0/gems/rhc-1.38.7/lib/rhc/commands/tail.rb:21:in运行 ' 从/var/lib/gems/2.3.0/gems/rhc-1.38.7/lib/rhc/commands.rb:294:in在to_commander execute' from /var/lib/gems/2.3.0/gems/rhc-1.38.7/lib/rhc/commands.rb:285:in块（3级）' 从/ var/lib/gems/2.3.0/gems/commander-4.2.1/lib/commander/command.rb：180：在call' from /var/lib/gems/2.3.0/gems/commander-4.2.1/lib/commander/command.rb:155:in运行' from /var/lib/gems/2.3.0/gems/commander-4.2 .1/lib/commander/runner.rb：421：在run_active_command' from /var/lib/gems/2.3.0/gems/rhc-1.38.7/lib/rhc/command_runner.rb:72:in运行！' from /var/lib/gems/2.3.0/gems/commander-4.2.1/lib/commander/delegates.rb:8:in run!' from /var/lib/gems/2.3.0/gems/rhc-1.38.7/lib/rhc/cli.rb:37:in开始' from /var/lib/gems/2.3.0/gems/ RHC-1.38.7/bin中/右心导管检查：20：在<top (required)>' from /usr/local/bin/rhc:23:in负荷 ' 从/ usr/local/bin目录/ RHC：23：在'' 埃德温@埃德温 - 联想-FLEX-3-1130：〜$

这是什么正确的修复。如果我在铜牌下获得small.highcpu升级或中等cpu，如果确实与内存有关，是否仍会出现此问题？

Answer 1

502是一个网关问题。其中一台服务器的响应未到达另一台服务器。这也发生在我身上。

我的项目是Apache和Mysql（5.5）。我发现mysql服务器是真正的问题，因为我的流程清单非常庞大，并且由于表锁定和其他问题导致很少的流程卡住了。

通过指定像InnoDb这样的合适的存储引擎并将mysql更新为mariadb来优化我的数据库。

通过实施像memchache这样的缓存解决了这个问题，它减少了我的数据库服务器上的负载并且响应速度很快。

尝试重新启动服务器。

如果你看到504错误，你也可以检查你的两台服务器的超时时间。