# PageAccessSynchronizer

**URL:** <https://forum.inductiveautomation.com/t/pageaccesssynchronizer/15822>\
**Category:** Ignition\
**Created:** [October 31, 2017, 12:01pm UTC](https://forum.inductiveautomation.com/t/pageaccesssynchronizer/15822 "2017-10-31T12:01:40Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![HooK\_a](https://avatars.discourse-cdn.com/v4/letter/h/87869e/32.png) [@HooK\_a](https://forum.inductiveautomation.com/u/HooK_a)\
**Post date:** [October 31, 2017, 12:01pm UTC](https://forum.inductiveautomation.com/t/pageaccesssynchronizer/15822/1 "2017-10-31T12:01:40Z")

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Hi, all.  
We have redundant igniiton 7.8.4.

System Properties  
Context State Running  
Redundancy Mode Master  
Redundancy State Active  
Version 7.8.4 (b2016082217)  
Java Version Oracle Corporation 1.8.0\_102  
CPU % 18,3  
Memory (used/max) 314 mb / 2,0 gb  
Uptime 1 hours, 1 minutes, 8 seconds  
Timezone Asia/Karachi [GMT+5:00]  
Locale ru\_RU  
Java Library Path lib;lib\core\gateway

And sometimes we see error in console:

Thread ‘qtp1983330395-42’ failed to acquire lock to page with id ‘1’, attempted for 1 minutes out of allowed 1 minute. The thread that holds the lock has name ‘qtp1983330395-562’.

Why?

ERROR 16:35:40 DefaultExceptionMapper Unexpected error occurred

org.apache.wicket.page.CouldNotLockPageException: Could not lock page 1. Attempt lasted 1 minute  
more  
WARN 16:35:40 PageAccessSynchronizer “qtp1983330395-3140” prio=5 tid=3140 state=TIMED\_WAITING

org.apache.wicket.util.lang.Threads$ThreadDump  
more  
WARN 16:35:40 PageAccessSynchronizer Thread ‘qtp1983330395-2874’ failed to acquire lock to page with id ‘1’, attempted for 1 minute out of allowed 1 minute. The thread that holds the lock has name ‘qtp1983330395-3140’.  
WARN 16:20:48 ClockDriftDetector Clock drift, degraded performance, or pause-the-world detected. lastTime=Tue Oct 31 16:21:04 PKT 2017 currentTime=Tue Oct 31 16:20:48 PKT 2017 deviation from expected 1000ms delta=-16795ms.  
ERROR 16:17:09 DefaultExceptionMapper Unexpected error occurred

org.apache.wicket.page.CouldNotLockPageException: Could not lock page 1. Attempt lasted 1 minute  
more  
WARN 16:17:09 PageAccessSynchronizer “qtp1983330395-42” prio=5 tid=42 state=TIMED\_WAITING

org.apache.wicket.util.lang.Threads$ThreadDump  
more  
WARN 16:17:09 PageAccessSynchronizer Thread ‘qtp1983330395-21’ failed to acquire lock to page with id ‘1’, attempted for 1 minute out of allowed 1 minute. The thread that holds the lock has name ‘qtp1983330395-42’.  
ERROR 16:13:51 DefaultExceptionMapper Unexpected error occurred

org.apache.wicket.page.CouldNotLockPageException: Could not lock page 1. Attempt lasted 1 minute  
more  
WARN 16:13:51 PageAccessSynchronizer “qtp1983330395-562” prio=5 tid=562 state=TIMED\_WAITING

org.apache.wicket.util.lang.Threads$ThreadDump  
more  
WARN 16:13:51 PageAccessSynchronizer Thread ‘qtp1983330395-42’ failed to acquire lock to page with id ‘1’, attempted for 1 minutes out of allowed 1 minute. The thread that holds the lock has name ‘qtp1983330395-562’.