在httpclient.execute中的HttpClientConnectionOperator.connect时，套接字读取超时将被忽略 [英] Socket read timeout ignored when HttpClientConnectionOperator.connect in httpclient.execute

问题描述

下面是jstack的输出，请注意线程nid = 0x771d(30493).几个小时前开始的.

Below is output of jstack, watch the thread, nid=0x771d (30493). Which started several hours ago.

"taskScheduler-6" prio=10 tid=0x00007f4479e07800 nid=0x771d runnable [0x00007f446e63a000]
   java.lang.Thread.State: RUNNABLE
    at java.net.SocketInputStream.socketRead0(Native Method)
    at java.net.SocketInputStream.read(SocketInputStream.java:152)
    at java.net.SocketInputStream.read(SocketInputStream.java:122)
    at sun.security.ssl.InputRecord.readFully(InputRecord.java:442)
    at sun.security.ssl.InputRecord.readV3Record(InputRecord.java:554)
    at sun.security.ssl.InputRecord.read(InputRecord.java:509)
    at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:934)
    - locked <0x00000007601abdf0> (a java.lang.Object)
    at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1332)
    - locked <0x00000007601abea0> (a java.lang.Object)
    at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1359)
    at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1343)
    at org.apache.http.conn.ssl.SSLConnectionSocketFactory.createLayeredSocket(SSLConnectionSocketFactory
.java:275)
    at org.apache.http.conn.ssl.SSLConnectionSocketFactory.connectSocket(SSLConnectionSocketFactory.java:
254)
    at org.apache.http.impl.conn.HttpClientConnectionOperator.connect(HttpClientConnectionOperator.java:1
23)
    at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionMa
nager.java:318)
    at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:363)
    at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:219)
    at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:195)
    at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:86)
    at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:108)
    at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:184)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
    at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:106)

    ........ // other call stack of custom codes

并且线程的CPU时间始终不变，不会改变:(由top -Hp pid产生)

And the thread's CPU time is always the same, not change: (produced by top -Hp pid)

  PID USER      PR  NI  VIRT  RES  SHR S  %CPU %MEM    TIME+  COMMAND
30493 root      20   0 3832m 1.0g  11m S   0.0  2.2   0:01.20 java

这是Java代码:

    RequestConfig config = RequestConfig.custom().setConnectionRequestTimeout(so_timeout_milliseconds)
                        .setConnectTimeout(so_timeout_milliseconds).setSocketTimeout(so_timeout_milliseconds).build();  // so_timeout_milliseconds = 6000
    do {
        CloseableHttpClient httpclient = HttpClients.createDefault();
        try {
            HttpGet httpget = new HttpGet(url);
            httpget.setConfig(config);
            if (headers != null) {
                for (Header header : headers) {
                    httpget.addHeader(header);
                }
            }

            CloseableHttpResponse response = httpclient.execute(httpget); // see jstack output above
            try {
                StatusLine statusLine = response.getStatusLine();
                if (statusLine.getStatusCode() == HttpStatus.SC_OK) {
                    HttpEntity entity = response.getEntity();
                    if (entity != null) {
                        InputStream instream = entity.getContent();
                        try {
                            return IOUtils.isToString(instream);
                        } catch (IOException ex) {
                            throw ex;
                        } finally {
                            instream.close();
                        }
                    }
                }
            } finally {
                response.close();
            }
        } finally {
            httpclient.close();
        }
    } while (--try_times > 0);

HttpClient版本:

HttpClient version:

    <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpclient</artifactId>
        <version>4.3.5</version>
    </dependency>

1. 我不确定这是HTTPClient中的错误吗?如果是，那么什么零件代码会导致此问题?
2. 为什么线程处于RUNNABLE状态，并且CPU时间没有增加?

1. I am not sure is this a bug in HTTPClient? If yes, what part codes make this problem?
2. Why the thread is RUNNABLE status, and the CPU time does not increase?

在我看来，这是因为IO无法完成，所以它不会发生CPU中断，而是为什么状态不是SUSPEND.(在Java中，我的意思是WAITING).

In my opinion, this is because of IO can not complete, so it can not occur CPU Interruption, but why the status is not SUSPEND.(I means WAITING in Java).

推荐答案

我找到了解决方案，将httpclient更新为4.3.6，问题已解决. 这是 apache JIRA . 更改的代码是此处.

I have found a solution, update the httpclient to 4.3.6 and the problem is solved. This is apache JIRA. The changed codes is here.

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