Hello,
a few months ago, i have a OOM from catalogd
after that i monitor the heap usage and it seems that catalogd never
perform full GC
even when Old Generation usage is over 99%
i can perform a full GC manually and after that the Old Generation usage
will drop to 18%
clearly there is lots of free space
i dont understand why
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$sudo -u impala /usr/java/jdk1.8.0_74/bin/jmap -heap 76868
Attaching to process ID 76868, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 25.74-b02
using thread-local object allocation.
Parallel GC with 48 thread(s)
Heap Configuration:
MinHeapFreeRatio = 0
MaxHeapFreeRatio = 100
MaxHeapSize = 34359738368 (32768.0MB)
NewSize = 11453071360 (10922.5MB)
MaxNewSize = 11453071360 (10922.5MB)
OldSize = 22906667008 (21845.5MB)
NewRatio = 2
SurvivorRatio = 8
MetaspaceSize = 21807104 (20.796875MB)
CompressedClassSpaceSize = 1073741824 (1024.0MB)
MaxMetaspaceSize = 17592186044415 MB
G1HeapRegionSize = 0 (0.0MB)
Heap Usage:
PS Young Generation
Eden Space:
capacity = 11389632512 (10862.0MB)
used = 8377265840 (7989.18327331543MB)
free = 3012366672 (2872.8167266845703MB)
73.55167808244734% used
From Space:
capacity = 31981568 (30.5MB)
used = 25886816 (24.687591552734375MB)
free = 6094752 (5.812408447265625MB)
80.94292312371927% used
To Space:
capacity = 31457280 (30.0MB)
used = 0 (0.0MB)
free = 31457280 (30.0MB)
0.0% used
PS Old Generation
capacity = 22906667008 (21845.5MB)
used = 22800444088 (21744.197929382324MB)
free = 106222920 (101.30207061767578MB)
99.53627945976207% used
19085 interned Strings occupying 2356816 bytes.
---------------------------
$ sudo -u impala /usr/java/jdk1.8.0_74/bin/jcmd 76868 GC.run
76868:
Command executed successfully
---------------------------
$ sudo -u impala /usr/java/jdk1.8.0_74/bin/jmap -heap 76868
Attaching to process ID 76868, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 25.74-b02
using thread-local object allocation.
Parallel GC with 48 thread(s)
Heap Configuration:
MinHeapFreeRatio = 0
MaxHeapFreeRatio = 100
MaxHeapSize = 34359738368 (32768.0MB)
NewSize = 11453071360 (10922.5MB)
MaxNewSize = 11453071360 (10922.5MB)
OldSize = 22906667008 (21845.5MB)
NewRatio = 2
SurvivorRatio = 8
MetaspaceSize = 21807104 (20.796875MB)
CompressedClassSpaceSize = 1073741824 (1024.0MB)
MaxMetaspaceSize = 17592186044415 MB
G1HeapRegionSize = 0 (0.0MB)
Heap Usage:
PS Young Generation
Eden Space:
capacity = 11391205376 (10863.5MB)
used = 1129420064 (1077.0989074707031MB)
free = 10261785312 (9786.401092529297MB)
9.914842430806859% used
From Space:
capacity = 30932992 (29.5MB)
used = 0 (0.0MB)
free = 30932992 (29.5MB)
0.0% used
To Space:
capacity = 30932992 (29.5MB)
used = 0 (0.0MB)
free = 30932992 (29.5MB)
0.0% used
PS Old Generation
capacity = 22906667008 (21845.5MB)
used = 4267747272 (4070.0409622192383MB)
free = 18638919736 (17775.45903778076MB)
18.631026812017296% used
19074 interned Strings occupying 2355872 bytes.
