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From Chan Chor Pang <chin...@indetail.co.jp>
Subject when will catalogd perform full GC
Date Mon, 06 Nov 2017 00:21:26 GMT
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

---------------------------
$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.

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