Hean-Chhinling commented on code in PR #7726:
URL: https://github.com/apache/hadoop/pull/7726#discussion_r2143450213
##########
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/webapp/NMWebServices.java:
##########
@@ -271,6 +273,35 @@ public ContainerInfo
getNodeContainer(@javax.ws.rs.core.Context
}
+ @GET
+ @Path("/jstack")
Review Comment:
Stack and JStack are totally different from each other. JStack is used on
current running Java process to see what each thread are actually doing while
Stack is just a list of active methods that have been called.
Here is an example of JStack:
```
2025-05-06 14:43:45
Full thread dump OpenJDK 64-Bit Server VM (25.232-b09 mixed mode):
"Attach Listener" #36 daemon prio=9 os_prio=0 tid=0x00007f8cf6288800
nid=0x5601e waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"shuffle-client-4-1" #35 daemon prio=5 os_prio=0 tid=0x00007f8cd86e6800
nid=0x55f04 runnable [0x00007f8ccfc0e000]
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:93)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:86)
- locked <0x00000000c1402a30> (a
io.netty.channel.nio.SelectedSelectionKeySet)
- locked <0x00000000c1402a48> (a java.util.Collections$UnmodifiableSet)
- locked <0x00000000c14029e8> (a sun.nio.ch.EPollSelectorImpl)
at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:97)
at
```
Here is an example Stack:
```
Process Thread Dump:
263 active threads
Thread 5938 (qtp2085713965-5938):
State: RUNNABLE
Blocked count: 2
Waited count: 6
Stack:
sun.management.ThreadImpl.getThreadInfo1(Native Method)
sun.management.ThreadImpl.getThreadInfo(ThreadImpl.java:178)
sun.management.ThreadImpl.getThreadInfo(ThreadImpl.java:139)
org.apache.hadoop.util.ReflectionUtils.printThreadInfo(ReflectionUtils.java:169)
org.apache.hadoop.http.HttpServer2$StackServlet.doGet(HttpServer2.java:1563)
javax.servlet.http.HttpServlet.service(HttpServlet.java:687)
javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:799)
org.eclipse.jetty.servlet.ServletHandler$ChainEnd.doFilter(ServletHandler.java:1656)
com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:89)
com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:941)
com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:875)
org.apache.hadoop.yarn.server.resourcemanager.webapp.RMWebAppFilter.doFilter(RMWebAppFilter.java:178)
com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:829)
com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:82)
com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:119)
com.google.inject.servlet.GuiceFilter$1.call(GuiceFilter.java:133)
com.google.inject.servlet.GuiceFilter$1.call(GuiceFilter.java:130)
com.google.inject.servlet.GuiceFilter$Context.call(GuiceFilter.java:203)
com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:130)
Thread 5937 (qtp2085713965-5937):
```
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