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ASF GitHub Bot commented on FLINK-10423: ---------------------------------------- sjwiesman commented on a change in pull request #6814: [FLINK-10423][rocksdb][metrics] rocksdb native metrics monitor URL: https://github.com/apache/flink/pull/6814#discussion_r224854199 ########## File path: flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBKeyedStateBackend.java ########## @@ -606,6 +627,17 @@ private RocksDB openDB( Preconditions.checkState(1 + stateColumnFamilyDescriptors.size() == stateColumnFamilyHandles.size(), "Not all requested column family handles have been created"); + if (this.metricOptions.isEnabled()) { + this.nativeMetricMonitor = new RocksDBNativeMetricMonitor( + dbRef, + rocksDBResourceGuard, + metricOptions, + operatorMetricGroup + ); + + this.cancelStreamRegistry.registerCloseable(nativeMetricMonitor); Review comment: Why is this an issue? The cancelStreamRegistry is closed in `AbstractKeyedStateBackend#dispose`. I manually called close inside of `dispose` initially but I was concerned about the strict ordering it imposed. If the nativeMetricsWatcher wasn't closed first `rocksDBResourceGuard.close()` would block forever. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org > Forward RocksDB native metrics to Flink metrics reporter > --------------------------------------------------------- > > Key: FLINK-10423 > URL: https://issues.apache.org/jira/browse/FLINK-10423 > Project: Flink > Issue Type: New Feature > Components: Metrics, State Backends, Checkpointing > Reporter: Seth Wiesman > Assignee: Seth Wiesman > Priority: Major > Labels: pull-request-available > > RocksDB contains a number of metrics at the column family level about current > memory usage, open memtables, etc that would be useful to users wishing > greater insight what rocksdb is doing. This work is inspired heavily by the > comments on this rocksdb issue thread > (https://github.com/facebook/rocksdb/issues/3216#issuecomment-348779233) -- This message was sent by Atlassian JIRA (v7.6.3#76005)