在子进程 stdin.write 期间损坏的管道

问题描述

我与用于标记句子的服务器进行交互.此服务器在端口 2020 上本地启动.

I interact with a server that I use to tag sentences. This server is launched locally on port 2020.

例如，如果我通过下面使用的客户端在端口 2020 上发送 Je mange des pâtes .，服务器会回答 Je_CL mange_V des_P pâtes_N ._.，结果总是只有一行，如果我的输入不为空，总是一行.

For example, if I send Je mange des pâtes . on port 2020 through the client used below, the server answers Je_CL mange_V des_P pâtes_N ._., the result is always one line only, and always one line if my input is not empty.

我目前必须通过此服务器标记 9 568 个文件.前 9 483 个文件按预期标记.之后，输入流似乎已关闭/已满/其他原因，因为当我尝试在 stdinIOError，特别是 Broken Pipe 错误代码>.

I currently have to tag 9 568 files through this server. The first 9 483 files are tagged as expected. After that, the input stream seems closed / full / something else because I get an IOError, specifically a Broken Pipe error when I try to write on stdin.

当我跳过前 9 483 个第一个文件时，最后一个被标记没有任何问题，包括导致第一个错误的那个.

When I skip the first 9 483 first files, the last ones are tagged without any issue, including the one causing the first error.

我的服务器没有产生任何错误日志，表明发生了一些可疑的事情...我是否处理错误?一段时间后管道出现故障是否正常?

My server doesn't produce any error log indicating something fishy happened... Do I handle something incorrectly? Is it normal that the pipe fails after some time?

log = codecs.open('stanford-tagger.log', 'w', 'utf-8')
p1 = Popen(["java",
            "-cp", JAR,
            "edu.stanford.nlp.tagger.maxent.MaxentTaggerServer",
            "-client",
            "-port", "2020"],
           stdin=PIPE,
           stdout=PIPE,
           stderr=log)

fhi = codecs.open(SUMMARY, 'r', 'utf-8') # a descriptor of the files to tag

for i, line in enumerate(fhi, 1):
    if i % 500:
        print "Tagged " + str(i) + " documents..."
    tokens = ... # a list of words, can be quite long
    try:
        p1.stdin.write(' '.join(tokens).encode('utf-8') + '\n')
    except IOError:
        print 'bouh, I failed ;(('
    result = p1.stdout.readline()
    # Here I do something with result...
fhi.close()

推荐答案

除了我的评论之外，我可能会建议一些其他更改...

In addition to my comments, I might suggest a few other changes...

for i, line in enumerate(fhi, 1):
    if i % 500:
        print "Tagged " + str(i) + " documents..."
    tokens = ... # a list of words, can be quite long
    try:
        s = ' '.join(tokens).encode('utf-8') + '\n'
        assert s.find('\n') == len(s) - 1       # Make sure there's only one CR in s
        p1.stdin.write(s)
        p1.stdin.flush()                        # Block until we're sure it's been sent
    except IOError:
        print 'bouh, I failed ;(('
    result = p1.stdout.readline()
    assert result                               # Make sure we got something back
    assert result.find('\n') == len(result) - 1 # Make sure there's only one CR in result
    # Here I do something with result...
fhi.close()

...但鉴于还有一个我们一无所知的客户端/服务器，有很多地方可能会出错.

...but given there's also a client/server of which we know nothing about, there's a lot of places it could be going wrong.

如果您将所有查询转储到一个文件中，然后从命令行使用类似...的内容运行它，它会起作用吗?

Does it work if you dump all the queries into a single file, and then run it from the commandline with something like...

java .... < input > output

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