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尝试获取 NameNodeStatus 时，curl 被卡住

tag-icon • tag-icon linux networking curl http hadoop
尝试获取 NameNodeStatus 时，curl 被卡住

我们的hadoop集群中有两个namenode

这是返回良好状态的名称节点之一的好例子

第一个 namenode 机器 IP -92.3.44.2

curl -v http://92.3.44.2:50070/jmx?qry=Hadoop:service=NameNode,name=NameNodeStatus
* About to connect() to 92.3.44.2 port 50070 (#0)
*   Trying 92.3.44.2...
* Connected to 92.3.44.2 (92.3.44.2) port 50070 (#0)
> GET /jmx?qry=Hadoop:service=NameNode,name=NameNodeStatus HTTP/1.1
> User-Agent: curl/7.29.0
> Host: 92.3.44.2:50070
> Accept: */*
>
< HTTP/1.1 200 OK
< Cache-Control: no-cache
< Expires: Mon, 27 Jan 2020 15:39:57 GMT
< Date: Mon, 27 Jan 2020 15:39:57 GMT
< Pragma: no-cache
< Expires: Mon, 27 Jan 2020 15:39:57 GMT
< Date: Mon, 27 Jan 2020 15:39:57 GMT
< Pragma: no-cache
< Content-Type: application/json; charset=utf-8
< X-FRAME-OPTIONS: SAMEORIGIN
< Access-Control-Allow-Methods: GET
< Access-Control-Allow-Origin: *
< Transfer-Encoding: chunked
< Server: Jetty(6.1.26.hwx)
<
{
  "beans" : [ {
    "name" : "Hadoop:service=NameNode,name=NameNodeStatus",
    "modelerType" : "org.apache.hadoop.hdfs.server.namenode.NameNode",
    "State" : "active",
    "NNRole" : "NameNode",
    "HostAndPort" : "namenode.kuku.com:8020",
    "SecurityEnabled" : false,
    "LastHATransitionTime" : 1579019610100,
    "BytesWithFutureGenerationStamps" : 0,
    "SlowPeersReport" : null,
    "SlowDisksReport" : null
  } ]
* Connection #0 to host 92.3.44.2 left intact

但在第二个名称节点上，图片是不同的

例子

curl -v http://92.3.44.3:50070/jmx?qry=Hadoop:service=NameNode,name=NameNodeStatus
* About to connect() to 92.3.44.3 port 50070 (#0)
*   Trying 92.3.44.3...
* Connected to 92.3.44.2 (92.3.44.2) port 50070 (#0)
> GET /jmx?qry=Hadoop:service=NameNode,name=NameNodeStatus HTTP/1.1
> User-Agent: curl/7.29.0
> Host: 92.3.44.2:50070
> Accept: */*
>

我们可以看到命令curl被卡住了

如何确定curl卡住的原因？

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