[IGNITE-13100] ClassCastException in cache group metrics on client nodes

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.9
• Assignee: Alexey Goncharuk
• Reporter: Alexey Goncharuk
• Created: 01/Jun/20 09:56
• Updated: 02/Jun/20 18:22
• Resolved: 02/Jun/20 13:38

Description

The following exception can be observed when reading cache group metrics on client nodes with persistence-enabled config:

java.lang.ClassCastException: org.apache.ignite.internal.processors.cache.persistence.IgniteCacheDatabaseSharedManager cannot be cast to org.apache.ignite.internal.processors.cache.persistence.GridCacheDatabaseSharedManager
	at org.apache.ignite.internal.processors.cache.CacheGroupMetricsImpl.database(CacheGroupMetricsImpl.java:506)
	at org.apache.ignite.internal.processors.cache.CacheGroupMetricsImpl.lambda$new$0(CacheGroupMetricsImpl.java:103)
	at org.apache.ignite.internal.util.lang.GridFunc.lambda$nonThrowableSupplier$3(GridFunc.java:3341)
	at org.apache.ignite.internal.processors.metric.impl.LongGauge.value(LongGauge.java:45)
	at org.apache.ignite.spi.metric.LongMetric.getAsString(LongMetric.java:29)

The reason is an incomplete check for persistence enabled in CacheGroupMetricsImpl: we should also check for client nodes.

Suggested solution: include the check for client node mode for database metrics readings

Issue Links

• links to: GitHub Pull Request #7875