- Native Thread
- Demon Thread
- Non-Demon Thread
Demon Thread:- Created by JVM(JVM will not wait for finish their work).
Non-Demon Thread :- Created by Application. (The Main Thread is always Non-Demon thread).
Thread Problems :- These are the things happens at Application server side. and in these situations, we will take Thread Dump and analyze issues.
- Application Server Freezes
- Application Server unresponsiveness
- Application server Crash or Hang
- Application Server CPU is 100% High load
- GC is crashing.
- Slow Performance due to high Response Time
- Server performance problems with API calls
- Hang Threads
- Server restarts
Thread States :-
New
Running ---> High CPU issues
Waiting
Timed waiting
Blocked --> Application Unresponsiveness
Terminated
Thread Including :-
Thread name
Thread Type & Priority
Thread ID
Native Thread ID
Java Thread stack Trace
Java Heap breakdown
Counters :-
Live Threads
Peak Threads
Demon Threads
Total Started Threads
Thread Contentions or Resource Contention
User Threads & Kernal Threads
Deadlocks
Multi Threading
Thread Concurrency
Thread Dump
Single Thread & Multi Thread
Thread Pool Size
Thread Count
Thread State
Thread Group
Thread Execution
Thread Patterns
Daemon Thread :- Created by JVM (JVM will not wait for finish Their work)
Non-Daemon Thread :- Created by Application (The Main Thread is always Non-Daemon Thread).
Native Thread :- Any Thread which is mapped to OS that is called Native Thread.
Resource or Thread Contention :- where Two or More threads are fighting with same resources.
if you have more number of waiting threads, then there is too much of Resource Contention.
Note : When CPU Utilization is more not coming down then take two Thread Dumps with 10sec gap eg : Dump1 and Dump2
