StateStoreMetrics¶

StateStoreMetrics holds the performance metrics of StateStores and SymmetricHashJoinStateManager.

Creating Instance¶

StateStoreMetrics takes the following to be created:

• Number of Keys
• Memory used (in bytes)
• Custom Metrics

StateStoreMetrics is created when:

• HDFSBackedStateStore is requested for metrics
• RocksDBStateStore is requested for metrics
• StateStoreMetrics is requested to combine metrics
• SymmetricHashJoinStateManager is requested for metrics

Custom Metrics¶

StateStoreMetrics is given StateStoreCustomMetrics and their current values when created.