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From Oleg Kalnichevski <ol...@apache.org>
Subject Re: HttpClient thread seems waiting for stuff for a long time and do not stop
Date Mon, 11 Jun 2018 12:27:48 GMT
On Fri, 2018-06-08 at 15:30 +0800, zhangminglei wrote:
> Hi, friends.
> 
>  I am using HttpClient for a few tests. And I use the below code to
> run without success. But the process never stoped. 
> I use jstack for this and found it always wait for something. Could
> you help me please ? Thanks.
> 
> parking to wait for <0x000000076c1d0980> (a
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject
> )
> 
> Best
> Minglei
> 
> public class HttpClientWithSync {
> 
>    public static void main(String[] args) {
> 
>       String url = "https://www.baidu.com/";
> 
>       String[] strs = new String[] {url, url, url};
> 
>       CloseableHttpClient httpclient = HttpClients.createDefault();
> 
>       for (int i = 0; i < 3; i++) {
>          HttpGet httpget = new HttpGet(strs[i]);
>          System.out.println();
>          try {
>             System.out.println("Waiting for the contents, hurry!
> hurry ! hurry!.....");
> 
>             // take a while and block the main thread.
>             HttpResponse response = httpclient.execute(httpget);
> 
>             if (response.getStatusLine().getStatusCode() ==
> HttpStatus.SC_OK) {
>                System.out.println("============ Get the entity
> ============ "+ response.getEntity());
>             }
>             // after getting the value from the url and then do this
> or do not if something unexpected to happen.
>             System.out.println("Do some other stuff");
>          } catch (IOException e) {
>             e.printStackTrace();
>          }
>       }
>       try {
>          httpclient.close();
>       } catch (IOException e) {
>          e.printStackTrace();
>       }
>    }
> }
> 

Your code is leaking connections.

Please see 

http://hc.apache.org/httpcomponents-client-4.5.x/tutorial/html/fundamen
tals.html#d5e145

Oleg


> 
> The full thread dump are
> 
> 2018-06-08 11:02:08
> Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.161-b12 mixed
> mode):
> 
> "Attach Listener" #12 daemon prio=9 os_prio=31 tid=0x00007fce8904a000
> nid=0x1207 waiting on condition [0x0000000000000000]
>    java.lang.Thread.State: RUNNABLE
> 
> "Service Thread" #10 daemon prio=9 os_prio=31 tid=0x00007fce8c04b800
> nid=0x5503 runnable [0x0000000000000000]
>    java.lang.Thread.State: RUNNABLE
> 
> "C1 CompilerThread3" #9 daemon prio=9 os_prio=31
> tid=0x00007fce8c002800 nid=0x5303 waiting on condition
> [0x0000000000000000]
>    java.lang.Thread.State: RUNNABLE
> 
> "C2 CompilerThread2" #8 daemon prio=9 os_prio=31
> tid=0x00007fce89084000 nid=0x5103 waiting on condition
> [0x0000000000000000]
>    java.lang.Thread.State: RUNNABLE
> 
> "C2 CompilerThread1" #7 daemon prio=9 os_prio=31
> tid=0x00007fce8c002000 nid=0x4f03 waiting on condition
> [0x0000000000000000]
>    java.lang.Thread.State: RUNNABLE
> 
> "C2 CompilerThread0" #6 daemon prio=9 os_prio=31
> tid=0x00007fce8c001000 nid=0x4d03 waiting on condition
> [0x0000000000000000]
>    java.lang.Thread.State: RUNNABLE
> 
> "Monitor Ctrl-Break" #5 daemon prio=5 os_prio=31
> tid=0x00007fce8a83b800 nid=0x4b03 runnable [0x0000700007e38000]
>    java.lang.Thread.State: RUNNABLE
>    at java.net.SocketInputStream.socketRead0(Native Method)
>    at
> java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
>    at java.net.SocketInputStream.read(SocketInputStream.java:171)
>    at java.net.SocketInputStream.read(SocketInputStream.java:141)
>    at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:284)
>    at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:326)
>    at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
>    - locked <0x000000076adce880> (a java.io.InputStreamReader)
>    at java.io.InputStreamReader.read(InputStreamReader.java:184)
>    at java.io.BufferedReader.fill(BufferedReader.java:161)
>    at java.io.BufferedReader.readLine(BufferedReader.java:324)
>    - locked <0x000000076adce880> (a java.io.InputStreamReader)
>    at java.io.BufferedReader.readLine(BufferedReader.java:389)
>    at
> com.intellij.rt.execution.application.AppMainV2$1.run(AppMainV2.java:
> 64)
> 
> "Signal Dispatcher" #4 daemon prio=9 os_prio=31
> tid=0x00007fce8881c000 nid=0x4903 runnable [0x0000000000000000]
>    java.lang.Thread.State: RUNNABLE
> 
> "Finalizer" #3 daemon prio=8 os_prio=31 tid=0x00007fce89003800
> nid=0x3903 in Object.wait() [0x0000700007c32000]
>    java.lang.Thread.State: WAITING (on object monitor)
>    at java.lang.Object.wait(Native Method)
>    - waiting on <0x000000076ab08ec0> (a
> java.lang.ref.ReferenceQueue$Lock)
>    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
>    - locked <0x000000076ab08ec0> (a
> java.lang.ref.ReferenceQueue$Lock)
>    at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164)
>    at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:209)
> 
> "Reference Handler" #2 daemon prio=10 os_prio=31
> tid=0x00007fce8b004000 nid=0x3703 in Object.wait()
> [0x0000700007b2f000]
>    java.lang.Thread.State: WAITING (on object monitor)
>    at java.lang.Object.wait(Native Method)
>    - waiting on <0x000000076ab06b68> (a java.lang.ref.Reference$Lock)
>    at java.lang.Object.wait(Object.java:502)
>    at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
>    - locked <0x000000076ab06b68> (a java.lang.ref.Reference$Lock)
>    at
> java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)
> 
> "main" #1 prio=5 os_prio=31 tid=0x00007fce8a008000 nid=0x1c03 waiting
> on condition [0x0000700007110000]
>    java.lang.Thread.State: WAITING (parking)
>    at sun.misc.Unsafe.park(Native Method)
>    - parking to wait for  <0x000000076c1d0980> (a
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject
> )
>    at
> java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
>    at
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject
> .await(AbstractQueuedSynchronizer.java:2039)
>    at
> org.apache.http.pool.AbstractConnPool.getPoolEntryBlocking(AbstractCo
> nnPool.java:377)
>    at
> org.apache.http.pool.AbstractConnPool.access$200(AbstractConnPool.jav
> a:67)
>    at
> org.apache.http.pool.AbstractConnPool$2.get(AbstractConnPool.java:243
> )
>    - locked <0x000000076d160008> (a
> org.apache.http.pool.AbstractConnPool$2)
>    at
> org.apache.http.pool.AbstractConnPool$2.get(AbstractConnPool.java:191
> )
>    at
> org.apache.http.impl.conn.PoolingHttpClientConnectionManager.leaseCon
> nection(PoolingHttpClientConnectionManager.java:282)
>    at
> org.apache.http.impl.conn.PoolingHttpClientConnectionManager$1.get(Po
> olingHttpClientConnectionManager.java:269)
>    at
> org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.
> java:191)
>    at
> org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java
> :185)
>    at
> org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)
>    at
> org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java
> :111)
>    at
> org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttp
> Client.java:185)
>    at
> org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttp
> Client.java:83)
>    at
> org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttp
> Client.java:108)
>    at
> org.apache.flink.streaming.connectors.fs.HttpClientWithSync.main(Http
> ClientWithSync.java:37)
> 
> "VM Thread" os_prio=31 tid=0x00007fce88819000 nid=0x3503 runnable 
> 
> "GC task thread#0 (ParallelGC)" os_prio=31 tid=0x00007fce8a014000
> nid=0x2503 runnable 
> 
> "GC task thread#1 (ParallelGC)" os_prio=31 tid=0x00007fce8a014800
> nid=0x2703 runnable 
> 
> "GC task thread#2 (ParallelGC)" os_prio=31 tid=0x00007fce89004800
> nid=0x2903 runnable 
> 
> "GC task thread#3 (ParallelGC)" os_prio=31 tid=0x00007fce88800800
> nid=0x2b03 runnable 
> 
> "GC task thread#4 (ParallelGC)" os_prio=31 tid=0x00007fce88808800
> nid=0x2d03 runnable 
> 
> "GC task thread#5 (ParallelGC)" os_prio=31 tid=0x00007fce88809000
> nid=0x2f03 runnable 
> 
> "GC task thread#6 (ParallelGC)" os_prio=31 tid=0x00007fce89005800
> nid=0x3103 runnable 
> 
> "GC task thread#7 (ParallelGC)" os_prio=31 tid=0x00007fce89006000
> nid=0x3303 runnable 
> 
> "VM Periodic Task Thread" os_prio=31 tid=0x00007fce888c7000
> nid=0x5703 waiting on condition 
> 
> JNI global references: 364
> 
> 

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