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https://issues.apache.org/jira/browse/PHOENIX-3518?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15723176#comment-15723176
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Jonathan Leech commented on PHOENIX-3518:
-----------------------------------------
>From Eclipse memory analysis tool
Class Name
| Shallow Heap | Retained Heap
-----------------------------------------------------------------------------------------------------------------------------------------------
java.lang.ref.WeakReference @ 0x7378442d0
| 32 | 0
'- item java.util.concurrent.LinkedBlockingQueue$Node @ 0x7378442f0
| 24 | 0
'- last java.util.concurrent.LinkedBlockingQueue @ 0x5cc884f00
| 48 | 0
'- connectionsQueue
org.apache.phoenix.query.ConnectionQueryServicesImpl$RenewLeaseTask @
0x5cd8870e8 | 24 | 0
'- task java.util.concurrent.Executors$RunnableAdapter @ 0x5cd8870d0
| 24 | 0
'- callable
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask @
0x5cd887088 | 72 | 0
'- [8] java.util.concurrent.RunnableScheduledFuture[16] @
0x5cd886d78 | 80 | 0
'- queue
java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue @ 0x5cd886d58
| 32 | 0
|- <Java Local> java.lang.Thread @ 0x5cd8874d8
PHOENIX-SCANNER-RENEW-LEASE-thread-9 Thread| 120 | 0
|- <Java Local> java.lang.Thread @ 0x5cd8877f8
PHOENIX-SCANNER-RENEW-LEASE-thread-3 Thread| 120 | 0
|- <Java Local> java.lang.Thread @ 0x5cd887b10
PHOENIX-SCANNER-RENEW-LEASE-thread-4 Thread| 120 | 0
|- <Java Local> java.lang.Thread @ 0x5cd887e28
PHOENIX-SCANNER-RENEW-LEASE-thread-0 Thread| 120 | 0
|- <Java Local> java.lang.Thread @ 0x5cd888140
PHOENIX-SCANNER-RENEW-LEASE-thread-5 Thread| 120 | 0
|- <Java Local> java.lang.Thread @ 0x5cd890380
PHOENIX-SCANNER-RENEW-LEASE-thread-1 Thread| 120 | 0
|- <Java Local> java.lang.Thread @ 0x5cd890698
PHOENIX-SCANNER-RENEW-LEASE-thread-7 Thread| 120 | 0
|- <Java Local> java.lang.Thread @ 0x5cd890948
PHOENIX-SCANNER-RENEW-LEASE-thread-8 Thread| 120 | 0
|- <Java Local> java.lang.Thread @ 0x5cd890bf8
PHOENIX-SCANNER-RENEW-LEASE-thread-6 Thread| 120 | 0
|- <Java Local> java.lang.Thread @ 0x5cd890f10
PHOENIX-SCANNER-RENEW-LEASE-thread-2 Thread| 120 | 0
|- workQueue
java.util.concurrent.ScheduledThreadPoolExecutor @ 0x5cd886cf8 |
80 | 0
'- Total: 11 entries
| |
-----------------------------------------------------------------------------------------------------------------------------------------------
>From jmap -histo:live
num #instances #bytes class name
----------------------------------------------
1: 100167888 3205372416 java.lang.ref.WeakReference
2: 100166733 2404001592
java.util.concurrent.LinkedBlockingQueue$Node
...
>From jmap -heap
PS Old Generation
capacity = 5595201536 (5336.0MB)
used = 5594874240 (5335.6878662109375MB)
free = 327296 (0.3121337890625MB)
99.99415041624695% used
> Memory Leak in RenewLeaseTask
> -----------------------------
>
> Key: PHOENIX-3518
> URL: https://issues.apache.org/jira/browse/PHOENIX-3518
> Project: Phoenix
> Issue Type: Bug
> Affects Versions: 4.7.0
> Environment: 5.7.1-1.cdh5.7.1.p0.11 + jdk1.7.0_67
> 4.7.0-1.clabs_phoenix1.3.0.p0.000
> CentOS Linux release 7.0.1406 (Core)
> apache-tomcat-8.5.4 + jdk1.8.0_102
> Reporter: Jonathan Leech
>
> Looks like PHOENIX-2357 introduced a memory leak, at least for me... I end up
> with old gen filled up with objects - 100,000,000 instances each of
> WeakReference and LinkedBlockingQueue$Node, owned by
> ConnectionQueryServicesImpl.connectionsQueue. The PhoenixConnection referred
> to by the WeakReference is null for all but the few active connections. I
> don't see anything in the log - I can't confirm that it's logging properly
> though. Per the docs for ScheduledThreadPoolExecutor, if the run method
> throws an error, further executions are suppressed.
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