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总结
本章主要记录.Java多线程
分析和使用过程中的一些技巧.后续的内容也会陆续补充在此处.
正文
- 如何Dump文件?
使用jstack -l <pid> >> filename
. 例如:jstack -l 20866 > hello.log
参考
如何分析Thread Dump(收集)
Dump文件
JAVA dump查看线程运行情况
2019-03-22 10:41:05
Full thread dump Java HotSpot(TM) 64-Bit Server VM (25.102-b14 mixed mode):
"Attach Listener" #24434 daemon prio=9 os_prio=31 tid=0x00007fe56bd78800 nid=0x335b waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"org.apache.hadoop.fs.FileSystem$Statistics$StatisticsDataReferenceCleaner" #11 daemon prio=5 os_prio=31 tid=0x00007fe56bdb1800 nid=0x3a07 in Object.wait() [0x0000700005d00000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <0x0000000781b23218> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
- locked <0x0000000781b23218> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:164)
at org.apache.hadoop.fs.FileSystem$Statistics$StatisticsDataReferenceCleaner.run(FileSystem.java:3061)
at java.lang.Thread.run(Thread.java:745)
Locked ownable synchronizers:
- None
"Service Thread" #8 daemon prio=9 os_prio=31 tid=0x00007fe56b030000 nid=0x4503 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"C1 CompilerThread2" #7 daemon prio=9 os_prio=31 tid=0x00007fe56c001000 nid=0x4603 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"C2 CompilerThread1" #6 daemon prio=9 os_prio=31 tid=0x00007fe56b02f800 nid=0x3703 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"C2 CompilerThread0" #5 daemon prio=9 os_prio=31 tid=0x00007fe56b871000 nid=0x3603 waiting on condition [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"Signal Dispatcher" #4 daemon prio=9 os_prio=31 tid=0x00007fe56b878800 nid=0x4903 runnable [0x0000000000000000]
java.lang.Thread.State: RUNNABLE
Locked ownable synchronizers:
- None
"Finalizer" #3 daemon prio=8 os_prio=31 tid=0x00007fe56c000000 nid=0x3003 in Object.wait() [0x00007000055eb000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
- locked <0x000000078183b2d0> (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)
Locked ownable synchronizers:
- None
"Reference Handler" #2 daemon prio=10 os_prio=31 tid=0x00007fe56b010000 nid=0x5103 in Object.wait() [0x00007000054e8000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:502)
at java.lang.ref.Reference.tryHandlePending(Reference.java:191)
- locked <0x000000078183b310> (a java.lang.ref.Reference$Lock)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:153)
Locked ownable synchronizers:
- None
"main" #1 prio=5 os_prio=31 tid=0x00007fe56b005000 nid=0x1c03 waiting on condition [0x0000700004ed6000]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at org.apache.hadoop.mapreduce.v2.hs.HistoryFileManager.createHistoryDirs(HistoryFileManager.java:586)
at org.apache.hadoop.mapreduce.v2.hs.HistoryFileManager.serviceInit(HistoryFileManager.java:552)
at org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
- locked <0x0000000781b23ae0> (a java.lang.Object)
at org.apache.hadoop.mapreduce.v2.hs.JobHistory.serviceInit(JobHistory.java:94)
at org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
- locked <0x0000000781853c20> (a java.lang.Object)
at org.apache.hadoop.service.CompositeService.serviceInit(CompositeService.java:107)
at org.apache.hadoop.mapreduce.v2.hs.JobHistoryServer.serviceInit(JobHistoryServer.java:143)
at org.apache.hadoop.service.AbstractService.init(AbstractService.java:163)
- locked <0x0000000781853cb8> (a java.lang.Object)
at org.apache.hadoop.mapreduce.v2.hs.JobHistoryServer.launchJobHistoryServer(JobHistoryServer.java:221)
at org.apache.hadoop.mapreduce.v2.hs.JobHistoryServer.main(JobHistoryServer.java:231)
Locked ownable synchronizers:
- None
"VM Thread" os_prio=31 tid=0x00007fe56b868800 nid=0x5203 runnable
"GC task thread#0 (ParallelGC)" os_prio=31 tid=0x00007fe56b816800 nid=0x2007 runnable
"GC task thread#1 (ParallelGC)" os_prio=31 tid=0x00007fe56b817800 nid=0x2a03 runnable
"GC task thread#2 (ParallelGC)" os_prio=31 tid=0x00007fe56b818000 nid=0x2b03 runnable
"GC task thread#3 (ParallelGC)" os_prio=31 tid=0x00007fe56b818800 nid=0x5303 runnable
"VM Periodic Task Thread" os_prio=31 tid=0x00007fe56b01c800 nid=0x4303 waiting on condition
JNI global references: 267