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Use of Postgres arrays in JpaRepository methods may be using too much memory. Though it is currently unclear how much of a contributor this is to Out Of Memory errors.
For example, see this partial stack trace:
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| Component | Hazelcast Structure | Type | Purpose | Recommendation | Implementation Proposal | Notes |
|---|---|---|---|---|---|---|
| CPS | anchorDataCache | Map<String, AnchorDataCacheEntry> | Needs further analysis | |||
| NCMP | moduleSyncWorkQueue | BlockingQueue<DataNode> | Remove | TBC | Entire CM handles are stored in work queue for module sync. This creates very high memory usage during CM handle registration. The use of this blocking queue likely causes issues with load balancing during module sync also. | |
| NCMP | moduleSyncStartedOnCmHandles | Map<String, Object> | Remove | TBC | One entry is stored in memory per CM handle in ADVISED state. | |
| NCMP | dataSyncSemaphores | Map<String, Boolean> | No immediate action, see notes | Low priority - this map is only populated if data sync is enabled for a CM handle. If the feature is used, it will store one entry per CM handle with data sync enabled. | ||
| NCMP | trustLevelPerCmHandle | Map<String, TrustLevel> | Remove | TBC | One entry is stored in memory per CM handle. This is directly implicated in logs supplied in investigation of out-of-memory errors in CPS-2146 | |
| NCMP | trustLevelPerDmiPlugin | Map<String, TrustLevel> | Low risk, see notes | Low priority - there are only small number of DMIs, so this structure will not grow so large. However, if trustLevelPerCmHandle is being removed, this structure may be removed as part of the same solution. | ||
| NCMP | cmNotificationSubscriptionCache | Map<String, Map<String, DmiCmNotificationSubscriptionDetails>> | Will need further analysis in future; see notes | This is low priority, as the CM subscription feature is not yet implemented, thus it is not in use. It is unclear how much data will be stored in the structure. It is presumed to be low, as this structure will only hold pending subscriptions. |
ModuleSetTag lookup
As ModuleSetTag is a relatively new feature, and performance testing of that feature is not yet complete (in progress, see CPS-1805), there is some risk of this causing high memory consumption.
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