R ua解析器在单线程时工作正常，在多线程时失败

我试图在运行Ubuntu14.04和R3.2.2的AWS EC2实例上使用mclappy并行使用的R实现。我似乎不能对这个问题全神贯注。任何帮助都将不胜感激

运行下面的程序就可以了

parsed_ua <- as.data.frame(parse_agents(data))

以下是一些示例数据：

data <- c("Mozilla/5.0 (Linux; Android 4.4.2; en-us; SAMSUNG-SGH-I537 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Version/1.5 Chrome/28.0.1500.94 Mobile Safari/537.36",
    "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.115 Safari/537.36",
    "Mozilla/5.0 (iPhone; CPU iPhone OS 8_1_3 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12B466 Safari/600.1.4",
    "Mozilla/5.0 (iPhone; CPU iPhone OS 8_1_3 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12B466 Safari/600.1.4",
    "Mozilla/5.0 (iPhone; CPU iPhone OS 8_1_3 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12B466 Safari/600.1.4",
    "Mozilla/5.0 (iPad; U; CPU OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5",
    "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:36.0) Gecko/20100101 Firefox/36.0",
    "Mozilla/5.0 (Linux; Android 4.4.2; en-us; SAMSUNG-SGH-I537 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Version/1.5 Chrome/28.0.1500.94 Mobile Safari/537.36",
    "Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko",
    "Mozilla/5.0 (iPhone; CPU iPhone OS 8_1_3 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12B466 Safari/600.1.4"
    )

---

数据您需要添加日志代码（和一些战术
tryCatch（）
语句）或运行w/o
mclappy
一段时间，以查看哪些字符串会抛出错误。也许@oliver keyes也有一些想法。@hrbrmstr-谢谢你的建议。早些时候，我尝试了一些随机的tryCatch（）语句，但没有任何运气，但它们远非战术性的。需要注意的是，脚本在分割数据集时作为单个线程运行良好，但在到达McLappy部分时几乎立即失败（我通常会看到3-10个R进程在一瞬间启动，然后一切立即中断，R终端抛出警告消息。我将此变化归因于延迟）
In mclapply(split(data, rep(1:5,each=2)), function(x) { :
  all scheduled cores encountered errors in user code

data <- c("Mozilla/5.0 (Linux; Android 4.4.2; en-us; SAMSUNG-SGH-I537 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Version/1.5 Chrome/28.0.1500.94 Mobile Safari/537.36",
    "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.115 Safari/537.36",
    "Mozilla/5.0 (iPhone; CPU iPhone OS 8_1_3 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12B466 Safari/600.1.4",
    "Mozilla/5.0 (iPhone; CPU iPhone OS 8_1_3 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12B466 Safari/600.1.4",
    "Mozilla/5.0 (iPhone; CPU iPhone OS 8_1_3 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12B466 Safari/600.1.4",
    "Mozilla/5.0 (iPad; U; CPU OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5",
    "Mozilla/5.0 (Windows NT 6.3; WOW64; rv:36.0) Gecko/20100101 Firefox/36.0",
    "Mozilla/5.0 (Linux; Android 4.4.2; en-us; SAMSUNG-SGH-I537 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) Version/1.5 Chrome/28.0.1500.94 Mobile Safari/537.36",
    "Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko",
    "Mozilla/5.0 (iPhone; CPU iPhone OS 8_1_3 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12B466 Safari/600.1.4"
    )