![]() Highly customizable performance views for monitoring performance charts and trends are available. You can see the association of the caches, nodes, hosts and also Oracle WebLogic targets using Coherence*Web applications. You can correlate cluster nodes with the underlying hosts to determine CPU and memory utilization on those hosts in order to make better decisions for scaling your clusters. By including metric extensions in export or imported monitoring templates, multiple metric extensions can be easily shared at the same time between Enterprise Manager deployments. Metric Extensions are the next generation of User-Defined Metrics, which enable you to extend Enterprise Manager to monitor conditions specific to the enterprise's environment by creating new metrics for any target type. ![]() You can export and import monitoring templates to share monitoring settings between different Enterprise Manager deployments. You can create a monitoring template by pre-populating the monitoring template with metrics for a Coherence target. ![]() Nodes and caches can be proactively monitored by the Incident Management feature. The Cluster Home page provides immediate visibility into the worst caches in the system based on hits-to-gets ratio which is an overall health indicator for the cluster. The Cluster Home page displays an overview of the performance hotspots such as nodes with minimum available memory, publisher and receiver success rate, and nodes with maximum send queue size. It is composed of many individual nodes or java processes which work together to provide highly reliable and high speed virtual caching.Įnterprise Manager provides deep visibility into performance of all the artifacts such as caches, nodes, and services. Always get the reference of NamedCache by calling CacheFactory.getCache method.Oracle Coherence is an in-memory data-grid and distributed caching solution. Never make static reference to Named Cache. Even though the cache service got restarted due to the above issue, the named cache reference still holds the old static reference which will throw the error Private static NamedCache cache=CacheFactory.getCache(cacheName) ĭue to this, the named cache reference will be made initialized as a static reference during the first load. We were making a static reference of the namedcache in our code But after restart too, we were not able to access the NamedCache which make the issue a blocker one !!! Due to this error, our cache service were getting stopped and getting restarted. After some time, the issue starts again.įrom the logs, we could see another log partĠ5-10 11:38:30.999/81516.547 Oracle Coherence GE 12.1.3.0.5 (thread=PacketPublisher, member=12): Stopping cluster due to unhandled exception: : Illegal buffer offset in writing packet (offset: 42, length: 36, packet-count: 1, class: .ByteArrayWriteBuffer$ByteArrayBufferOutput, output: .(PacketBundle.CDB:30)Īt .(UdpSocket.CDB:22)Īt .(PacketBundle.CDB:1)Īt .PacketSpeaker$BundlingQueue.flush(PacketSpeaker.CDB:61)Īt .(ConcurrentQueue.CDB:1)Īt .PacketPublisher.flushSend(PacketPublisher.CDB:1)Īt .PacketPublisher.onWait(PacketPublisher.CDB:1) Once we restarted the cache servers, the issue would be gone. The named cache was not able to access due to which the cache servers was in fact in a freezed state. ![]() : SafeNamedCache was explicitly releasedĪt .(SafeNamedCache.CDB:23)Īt .(SafeNamedCache.CDB:1)Īt .(SafeNamedCache.CDB:1) : SafeNamedCache was explicitly released. Recently, we faced a challenging issue in Coherence service node with the below exception ![]()
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