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From "Gary Tully (JIRA)" <j...@apache.org>
Subject [jira] Updated: (AMQ-2916) Kaha persistence adapter not closing opend file after lock check in secondery server: shared file system mode
Date Mon, 13 Sep 2010 20:25:40 GMT

     [ https://issues.apache.org/activemq/browse/AMQ-2916?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gary Tully updated AMQ-2916:
----------------------------

    Summary: Kaha persistence adapter not closing opend file after lock check in secondery
server: shared file system mode  (was: KahaDb not closing opend file after lock check in secondery
server: shared file system mode)

workaround, try KahaDB  or AMQ store as alternatives.

> Kaha persistence adapter not closing opend file after lock check in secondery server:
shared file system mode
> -------------------------------------------------------------------------------------------------------------
>
>                 Key: AMQ-2916
>                 URL: https://issues.apache.org/activemq/browse/AMQ-2916
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: Broker
>    Affects Versions: 5.3.0
>         Environment: Mac os x 10.6 which NFS file system for shared file system
>            Reporter: Madhu Krishna
>            Priority: Critical
>
> This For KahaDb store.
> From the logs it looks like activeMq shared file system broker has a leak in RandomAccessfile
lock check. On a lock fail it is not closing the opened files. This is causing the secondary
server to run out of number of open files set in the OS. 
> Current OS is Set to 1024 max open files.
> I have been running some tests to validate this and the following is the observations.

> 1. Log from secondary server: 
> 2010-09-10 06:36:12,157 [MQ-BROKER-SERVICE] INFO  (KahaStore.java:463) - Kaha Store using
data directory /nfs/soleta/gdvt/activeMq 
> 2010-09-10 06:36:12,157 [MQ-BROKER-SERVICE] INFO  (KahaPersistenceAdapter.java:180) -
Store is locked... waiting 10 seconds for the Store to be unlocked. 
> 2010-09-10 06:36:22,159 [MQ-BROKER-SERVICE] INFO  (KahaStore.java:463) - Kaha Store using
data directory /nfs/soleta/gdvt/activeMq 
> 2010-09-10 06:36:22,161 [MQ-BROKER-SERVICE] INFO  (KahaPersistenceAdapter.java:180) -
Store is locked... waiting 10 seconds for the Store to be unlocked. 
> 2010-09-10 06:36:32,161 [MQ-BROKER-SERVICE] INFO  (KahaStore.java:463) - Kaha Store using
data directory /nfs/soleta/gdvt/activeMq 
> 2010-09-10 06:36:32,162 [MQ-BROKER-SERVICE] INFO  (KahaPersistenceAdapter.java:180) -
Store is locked... waiting 10 seconds for the Store to be unlocked. 
> 2010-09-10 06:36:42,162 [MQ-BROKER-SERVICE] INFO  (KahaStore.java:463) - Kaha Store using
data directory /nfs/soleta/gdvt/activeMq 
> 2010-09-10 06:36:42,174 [MQ-BROKER-SERVICE] INFO  (KahaPersistenceAdapter.java:180) -
Store is locked... waiting 10 seconds for the Store to be unlocked. 
> 2010-09-10 06:36:52,175 [MQ-BROKER-SERVICE] INFO  (KahaStore.java:463) - Kaha Store using
data directory /nfs/soleta/gdvt/activeMq 
> 2010-09-10 06:36:52,175 [MQ-BROKER-SERVICE] INFO  (KahaPersistenceAdapter.java:180) -
Store is locked... waiting 10 seconds for the Store to be unlocked. 
> 2010-09-10 06:37:02,175 [MQ-BROKER-SERVICE] INFO  (KahaStore.java:463) - Kaha Store using
data directory /nfs/soleta/gdvt/activeMq 
> 2010-09-10 06:37:02,176 [MQ-BROKER-SERVICE] INFO  (KahaPersistenceAdapter.java:180) -
Store is locked... waiting 10 seconds for the Store to be unlocked. 
> 2010-09-10 06:37:12,177 [MQ-BROKER-SERVICE] INFO  (KahaStore.java:463) - Kaha Store using
data directory /nfs/soleta/gdvt/activeMq 
> 2010-09-10 06:37:12,178 [MQ-BROKER-SERVICE] INFO  (KahaPersistenceAdapter.java:180) -
Store is locked... waiting 10 seconds for the Store to be unlocked. 
> Note: As you can see that the secondary server is trying to get the lock on  /nfs/soleta/gdvt/activeMq
file, it fails as the file has been locked by the primary server. So it tries to get the lock
very 10 seconds. 
> 2. Log from lsof | grep activeMq 
> java      13855 madhu   84u     REG       14,2         0 7519799 /nfs/soleta/gdvt/activeMq/lock

> java      13855 madhu   85u     REG       14,2         0 7519799 /nfs/soleta/gdvt/activeMq/lock

> java      13855 madhu   86u     REG       14,2         0 7519799 /nfs/soleta/gdvt/activeMq/lock

> java      13855 madhu   87u     REG       14,2         0 7519799 /nfs/soleta/gdvt/activeMq/lock

> java      13855 madhu   94u     REG       14,2         0 7519799 /nfs/soleta/gdvt/activeMq/lock

> java      13855 madhu   95u     REG       14,2         0 7519799 /nfs/soleta/gdvt/activeMq/lock

> java      13855 madhu   96u     REG       14,2         0 7519799 /nfs/soleta/gdvt/activeMq/lock

> java      13855 madhu   97u     REG       14,2         0 7519799 /nfs/soleta/gdvt/activeMq/lock

> You can see that the file used for the lock is not getting closed. 
> 3. Log from lsof | grep activeMq | wc -l 
> The above cmd will give us the total number of open files for " /nfs/soleta/gdvt/activeMq/lock"
. 
> et3-tk:~ madhu$ lsof | grep activeMq | wc -l 
>       56 
> et3-tk:~ madhu$ lsof | grep activeMq | wc -l 
>       57 
> et3-tk:~ madhu$ lsof | grep activeMq | wc -l 
>       58 
> et3-tk:~ madhu$ lsof | grep activeMq | wc -l 
>       62 
>  
> As you can see that the open files are increasing on "/nfs/soleta/gdvt/activeMq/lock"
and the count doesn't come down. 
>  
> Note: The below changes were done only for learning purpose. 
> I was able to resolve this issue by changing version 5.3.0 activeMq-core 
> org.apache.activemq.kaha.impl.KahaStore line no 465
> I replace line 465 with the following code 
>          try{
>             	lock();
>             }catch(StoreLockedExcpetion e){
>             	LOG.error("Got error locking file",e);
>                 lockFile.getChannel().close();
>                 lockFile.close();
>             	  throw new StoreLockedExcpetion("Kaha Store " + directory.getName() + "
 is already opened by another application");
>             }

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