Strong connection

Hi all,
I've got trouble with joining a member. There are already two members which talk to each other perfectly.
Can anyone shed light on this log entry?
FEINER: thread=Cluster, member=1: TcpRing: disconnected from member 2 due to transition to a strong connection
What is a strong connection?
Senior member log:
FEINER: thread=Cluster, member=1: Member(Id=3, Timestamp=2008-11-19 11:32:17.892, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2016) joined Cluster with senior member 1
19.11.2008 11:32:19 com.tangosol.coherence.component.util.logOutput.Jdk log
FEINER: thread=Cluster, member=1: TcpRing: connecting to member 3 using TcpSocket{State=STATE_OPEN, Socket=Socket[http://addr=/192.168.0.198,port=8088,localport=1754]}
19.11.2008 11:32:19 com.tangosol.coherence.component.util.logOutput.Jdk log
FEINER: thread=Cluster, member=1: TcpRing: disconnected from member 2 due to transition to a strong connection
Member failing to join logs:
INFO: thread=Cluster, member=n/a: This Member(Id=3, Timestamp=2008-11-19 11:32:17.892, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2016, Edition=Grid Edition, Mode=Production, CpuCount=2, SocketCount=1) joined cluster "cluster:0x37EB" with senior Member(Id=1, Timestamp=2008-11-19 11:31:03.796, Address=192.168.0.163:8088, MachineId=26787, Location=site:my.local,machine:my34,process:5256, Role=CoherenceServer, Edition=Grid Edition, Mode=Production, CpuCount=4, SocketCount=2)
19.11.2008 11:32:18 com.tangosol.coherence.component.util.logOutput.Jdk log
INFO: thread=AWT-EventQueue-0, member=3: Loaded cache configuration from resource "file:/C:/workspace/Java/trunk/build/classes/coherence-cache-config.xml"
19.11.2008 11:32:48 com.tangosol.coherence.component.util.logOutput.Jdk log
SCHWERWIEGEND: thread=AWT-EventQueue-0, member=3: Error while starting service "DistributedCache": com.tangosol.net.RequestTimeoutException: Request timed out after 30017 millis
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.checkRequestTimeout(Grid.CDB:8)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.poll(Grid.CDB:52)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.poll(Grid.CDB:11)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.ClusterService.ensureService(ClusterService.CDB:15)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.start(Grid.CDB:23)
at com.tangosol.coherence.component.util.SafeService.startService(SafeService.CDB:28)
at com.tangosol.coherence.component.util.safeService.SafeCacheService.startService(SafeCacheService.CDB:5)
at com.tangosol.coherence.component.util.SafeService.ensureRunningService(SafeService.CDB:27)
at com.tangosol.coherence.component.util.SafeService.start(SafeService.CDB:14)
at com.tangosol.net.DefaultConfigurableCacheFactory.ensureService(DefaultConfigurableCacheFactory.java:841)
at com.tangosol.net.DefaultConfigurableCacheFactory.ensureCache(DefaultConfigurableCacheFactory.java:710)
at com.tangosol.net.DefaultConfigurableCacheFactory.configureCache(DefaultConfigurableCacheFactory.java:919)
at com.tangosol.net.DefaultConfigurableCacheFactory.ensureCache(DefaultConfigurableCacheFactory.java:277)
at com.tangosol.net.CacheFactory.getCache(CacheFactory.java:689)
at com.tangosol.net.CacheFactory.getCache(CacheFactory.java:667)
Thanks in advance,
-Ralf
Edited by: user989723 on Nov 19, 2008 12:33 PM
I changed my configuration as followes:
<multicast-listener>
<address>235.1.2.3</address>
<port>3091</port>
<time-to-live>1</time-to-live>
<join-timeout-milliseconds>30000</join-timeout-milliseconds>
</multicast-listener>
<packet-publisher>
<packet-delivery>
<timeout-milliseconds>60000</timeout-milliseconds>
</packet-delivery>
</packet-publisher>
And:
<service id="3">
<service-type>DistributedCache</service-type>
<service-component>DistributedCache</service-component>
<use-filters>
<filter-name>gzip</filter-name>
</use-filters>
<init-params>
<init-param id="2">
<param-name>lease-granularity</param-name>
<param-value>member</param-value>
</init-param>
<init-param id="3">
<param-name>partition-count</param-name>
<param-value>31</param-value>
</init-param>
<init-param id="5">
<param-name>transfer-threshold</param-name>
<param-value>1024</param-value>
</init-param>
<init-param id="6">
<param-name>backup-count</param-name>
<param-value>2</param-value>
</init-param>
<init-param id="8">
<param-name>thread-count</param-name>
<param-value>4</param-value>
</init-param>
<init-param id="14">
<param-name>request-timeout</param-name>
<param-value>60000</param-value>
</init-param>
</init-params>
</service>
Waiting for a "long" time then shows this in senior member log:
19.11.2008 12:09:25 com.tangosol.coherence.component.util.logOutput.Jdk log
FEINER: thread=Cluster, member=1: TcpRing: disconnected from member 2 due to transition to a strong connection
19.11.2008 12:15:16 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=1: Member(Id=3, Timestamp=2008-11-19 12:09:24.322, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:304) has failed to respond to 17 packets; declaring this member as paused.
19.11.2008 12:15:28 com.tangosol.coherence.component.util.logOutput.Jdk log
WARNUNG: thread=PacketPublisher, member=1: Experienced a 11797 ms communication delay (probable remote GC) with Member(Id=3, Timestamp=2008-11-19 12:09:24.322, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:304); 75 packets rescheduled, PauseRate=0.0323, Threshold=1976
19.11.2008 12:15:29 com.tangosol.coherence.component.util.logOutput.Jdk log
FEINER: thread=Cluster, member=1: TcpRing: connecting to member 3 using TcpSocket{State=STATE_OPEN, Socket=Socket[addr=/192.168.0.198,port=8088,localport=2802]}
19.11.2008 12:16:31 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=1: Member(Id=3, Timestamp=2008-11-19 12:09:24.322, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:304) has failed to respond to 17 packets; declaring this member as paused.
19.11.2008 12:16:38 com.tangosol.coherence.component.util.logOutput.Jdk log
WARNUNG: thread=PacketPublisher, member=1: Experienced a 6719 ms communication delay (probable remote GC) with Member(Id=3, Timestamp=2008-11-19 12:09:24.322, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:304); 50 packets rescheduled, PauseRate=0.0426, Threshold=1878
19.11.2008 12:17:12 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=1: Member(Id=3, Timestamp=2008-11-19 12:09:24.322, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:304) has failed to respond to 17 packets; declaring this member as paused.
19.11.2008 12:17:12 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=1: Experienced a 15 ms communication delay (probable remote GC) with Member(Id=3, Timestamp=2008-11-19 12:09:24.322, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:304); 17 packets rescheduled, PauseRate=0.0396, Threshold=1785
19.11.2008 12:19:04 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=1: Member(Id=3, Timestamp=2008-11-19 12:09:24.322, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:304) has failed to respond to 17 packets; declaring this member as paused.
19.11.2008 12:19:12 com.tangosol.coherence.component.util.logOutput.Jdk log
WARNUNG: thread=PacketPublisher, member=1: Experienced a 8547 ms communication delay (probable remote GC) with Member(Id=3, Timestamp=2008-11-19 12:09:24.322, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:304); 59 packets rescheduled, PauseRate=0.046, Threshold=1612
19.11.2008 12:19:50 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=1: Member(Id=3, Timestamp=2008-11-19 12:09:24.322, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:304) has failed to respond to 17 packets; declaring this member as paused.
19.11.2008 12:20:03 com.tangosol.coherence.component.util.logOutput.Jdk log
WARNUNG: thread=PacketPublisher, member=1: Experienced a 13469 ms communication delay (probable remote GC) with Member(Id=3, Timestamp=2008-11-19 12:09:24.322, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:304); 83 packets rescheduled, PauseRate=0.0634, Threshold=1456
19.11.2008 12:20:03 com.tangosol.coherence.component.util.logOutput.Jdk log
FEINER: thread=Cluster, member=1: TcpRing: connecting to member 3 using TcpSocket{State=STATE_OPEN, Socket=Socket[addr=/192.168.0.198,port=8088,localport=2907]}
The JVMs (6u10) are started with args:
-server -verbose:gc -Xms512m -Xmx512m -XX:+DisableExplicitGC -XX:+UseParallelGC -Djava.library.path=lib/jTDS_1.2.2/SSO -Dtangosol.coherence.config=coherence-cache-config.xml -Dtangosol.coherence.override=tangosol-coherence-override.xml

Thanks Rob, so why is a disconnection forced for a strong connection? I think it's ok for a cluster to have a connection with a different machine ;-)
We've got two machines in development environment:
1. Server: Intel QuadCore, 2 GB RAM, 2x1 GBit (Teaming), 2 JVMs: DefaultCacheServer, MyCacheServer for loading data from database and inserting into cache
2. Workstation: Intel DualCore, 4 GB RAM, 1 GBit, 1 JVM: Client working on data in cache
Despite having GBit network cards, both are running on 100 MBit/s. In production there are more workstations querying the cache.
I see GCs in log of a JVM on the server when I start my desktop application:
20.11.2008 12:36:00 com.tangosol.coherence.component.util.logOutput.Jdk log
FEINER: thread=Cluster, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) joined Cluster with senior member 1
20.11.2008 12:36:00 com.tangosol.coherence.component.util.logOutput.Jdk log
FEINER: thread=Cluster, member=4: Member 2 joined Service Management with senior member 1
20.11.2008 12:36:01 com.tangosol.coherence.component.util.logOutput.Jdk log
FEINER: thread=Cluster, member=4: Member 2 joined Service DistributedCache with senior member 1
20.11.2008 12:36:01 com.tangosol.coherence.component.util.logOutput.Jdk log
FEINER: thread=DistributedCache, member=4: 2> Transferring 3 out of 11 primary partitions to member 2 requesting 3
20.11.2008 12:36:01 com.tangosol.coherence.component.util.logOutput.Jdk log
FEINER: thread=DistributedCache, member=4: 2) Transferring backup[1] for partition 12 from member 1 (over 3) to member 2 (under 13)
20.11.2008 12:36:01 com.tangosol.coherence.component.util.logOutput.Jdk log
FEINER: thread=DistributedCache, member=4: 2) Transferring backup[2] for partition 13 from member 3 (over 6) to member 2 (under 9)
20.11.2008 12:36:02 com.tangosol.coherence.component.util.logOutput.Jdk log
FEINER: thread=DistributedCache, member=4: 2) Transferring backup[2] for partition 14 from member 3 (over 4) to member 2 (under 6)
20.11.2008 12:36:02 com.tangosol.coherence.component.util.logOutput.Jdk log
FEINER: thread=DistributedCache, member=4: 2) Transferring backup[2] for partition 15 from member 3 (over 3) to member 2 (under 5)
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 0 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 304 packets rescheduled, PauseRate=0.0, Threshold=2775
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 16 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 276 packets rescheduled, PauseRate=0.0015, Threshold=2637
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 0 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 136 packets rescheduled, PauseRate=0.0015, Threshold=2506
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 16 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 546 packets rescheduled, PauseRate=0.0030, Threshold=2381
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 15 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 252 packets rescheduled, PauseRate=0.0044, Threshold=2262
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 0 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 129 packets rescheduled, PauseRate=0.0044, Threshold=2149
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 0 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 128 packets rescheduled, PauseRate=0.0044, Threshold=2042
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 0 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 126 packets rescheduled, PauseRate=0.0044, Threshold=1940
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 0 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 128 packets rescheduled, PauseRate=0.0044, Threshold=1843
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 63 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 410 packets rescheduled, PauseRate=0.0103, Threshold=1751
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 0 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 33 packets rescheduled, PauseRate=0.0103, Threshold=1664
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 0 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 97 packets rescheduled, PauseRate=0.0102, Threshold=1660
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 15 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 227 packets rescheduled, PauseRate=0.0116, Threshold=1577
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:10 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 0 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 33 packets rescheduled, PauseRate=0.0116, Threshold=1499
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 0 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 230 packets rescheduled, PauseRate=0.0115, Threshold=1496
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 15 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 260 packets rescheduled, PauseRate=0.0128, Threshold=1422
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 72 packets; declaring this member as paused.
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 0 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 185 packets rescheduled, PauseRate=0.0128, Threshold=1351
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 15 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 253 packets rescheduled, PauseRate=0.0141, Threshold=1284
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 0 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 33 packets rescheduled, PauseRate=0.0141, Threshold=1220
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 16 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 275 packets rescheduled, PauseRate=0.0155, Threshold=1159
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 15 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 214 packets rescheduled, PauseRate=0.0169, Threshold=1102
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 0 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 47 packets rescheduled, PauseRate=0.0168, Threshold=1047
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 0 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 186 packets rescheduled, PauseRate=0.0167, Threshold=946
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 16 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 24 packets rescheduled, PauseRate=0.0181, Threshold=899
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 16 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 40 packets rescheduled, PauseRate=0.0195, Threshold=855
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 12:36:11 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=4: Experienced a 0 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 12:35:59.883, Address=192.168.0.198:8088, MachineId=26822, Location=site:my.local,machine:mylap,process:2100); 29 packets rescheduled, PauseRate=0.0193, Threshold=853
And I see GCs on my workstation:
20.11.2008 12:36:06 ui.task.ConnectClusterTask enableCluster
FEIN: connected to cache
[GC 46688K->25091K(517056K), 0.0414128 secs]
[GC 68867K->48150K(517056K), 0.0357713 secs]
[GC 91926K->67998K(517056K), 0.0765421 secs]
[GC 111774K->89280K(517056K), 0.1152057 secs]
[GC 133056K->115866K(492736K), 0.1066485 secs]
[GC 135322K->124544K(504896K), 0.0755632 secs]
[GC 144000K->133172K(504896K), 0.0989548 secs]
[GC 152628K->141928K(504896K), 0.0867878 secs]
[GC 161384K->150792K(504896K), 0.0935929 secs]
[GC 170248K->159660K(504896K), 0.0803323 secs]
[GC 179116K->161604K(504896K), 0.0322206 secs]
[GC 181060K->161640K(504896K), 0.0158883 secs]
[GC 181096K->161632K(504896K), 0.0065547 secs]
[GC 181088K->161632K(504896K), 0.0064441 secs]
[GC 181088K->161632K(504896K), 0.0076786 secs]
[GC 181088K->161632K(504896K), 0.0068146 secs]
[GC 181088K->161632K(504896K), 0.0065274 secs]
[GC 181088K->161632K(504896K), 0.0066196 secs]
[GC 181088K->161632K(504896K), 0.0064584 secs]
[GC 181088K->161648K(504896K), 0.0080762 secs]
20.11.2008 12:36:15 ui.task.SearchTask doInBackground
FEIN: result.size() == 2
I can see the "remote GC error messages" in server log start when I query the cache (see timestamps; query started at 12:36:06, error messages started at 12:36:10). I am using two MapListener without a filter etc. in my desktop application for acting on newly inserted keys.
My application works as followes:
1. DB query of a whole table
2. Server does calculations on data from 1.
3. Server inserts approx. ~100,000 entries in one key in cache (key "list" => list with entries)
4. The server inserts a key referring to a list entry from 3.
5. Client acts on that key and inserts an "answer" into cache
My opinion is that working on the large list causes many minor collections. Even if I query namedCache.keySet() for listing all keys in cache (in development there are only two keys) I see minor collections.
I also tried using -Xincgc instead of -XX:UseParallelGC and setting the size of young generation: -XX:NewSize=256m -XX:MaxNewSize=512m which slightly reduced minor collections.
Thanks,
-Ralf
Edited by: Ralf B. on Nov 20, 2008 1:15 PM
Thats interesting. Sizing up the young generation to 512 MB stops minor collections, but:
Server log shows "communication delay":
20.11.2008 13:13:40 com.tangosol.coherence.component.util.logOutput.Jdk log
AM FEINSTEN: thread=PacketPublisher, member=1: Member(Id=2, Timestamp=2008-11-20 13:12:44.311, Address=192.168.0.163:8089, MachineId=26787, Location=site:my.local,machine:myserv,process:5208, Role=CacheServer) has failed to respond to 17 packets; declaring this member as paused.
20.11.2008 13:13:54 com.tangosol.coherence.component.util.logOutput.Jdk log
WARNUNG: thread=PacketPublisher, member=1: Experienced a 13907 ms communication delay (probable remote GC) with Member(Id=2, Timestamp=2008-11-20 13:12:44.311, Address=192.168.0.163:8089, MachineId=26787, Location=site:my.local,machine:myserv,process:5208, Role=CacheServer); 85 packets rescheduled, PauseRate=0.1998, Threshold=3364
Server shows no GC at all while showing all keys in cache (as I said above, that was causing GCs too):
key=work_1 locked by=null
key=list locked by=null
No more GCs on my workstation.
JVM args used for server and client: -Xincgc -XX:+DisableExplicitGC -XX:NewSize=512m -XX:MaxNewSize=512m -Xms1024m -Xmx1024m
Edited by: Ralf B. on Nov 20, 2008 4:10 PM
I was able to get rid of GCs by sizing the young generation. But "communication delay" messages are logged when an application accesses the cache. I am curious about the "0 - 16 ms" delays, can this be due to network outages?
Thanks,
-Ralf

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- Power off and then back on the router
- Reset network settings: Settings>General>Reset>Reset Network Settings
- iOS: Troubleshooting Wi-Fi networks and connections
- iOS: Recommended settings for Wi-Fi routers and access points
- Restore from backup. See:
iOS: How to back up
- Restore to factory settings/new iOS device.
- Make an appointment at the Genius Bar of an Apple store.
Apple Retail Store - Genius Bar

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