[jira] [Commented] (FLINK-10423) Forward RocksDB native metrics to Flink metrics reporter

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-10423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16644136#comment-16644136 ] 

ASF GitHub Bot commented on FLINK-10423:
----------------------------------------

zentol 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_r223873851
 
 

 ##########
 File path: flink-state-backends/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/RocksDBNativeMetricOptions.java
 ##########
 @@ -0,0 +1,278 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.contrib.streaming.state;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+
+/**
+ * Enable which RocksDB metrics to forward to Flink's metrics reporter.
+ * All metrics report at the column family level and return unsigned long values.
+ *
+ * <p>Properties and doc comments are taken from RocksDB documentation. See
+ * <a href="https://github.com/facebook/rocksdb/blob/64324e329eb0a9b4e77241a425a1615ff524c7f1/include/rocksdb/db.h#L429">
+ * db.h</a> for more information.
+ */
+public class RocksDBNativeMetricOptions {
+
+	private static final long TEN_SECONDS = 10 * 1000;
+
+	private Set<String> properties;
+
+	private long frequency = TEN_SECONDS;
+
+	public RocksDBNativeMetricOptions() {
+		this.properties = new HashSet<>();
+	}
+
+	/**
+	 * Returns number of immutable memtables that have not yet been flushed.
+	 */
+	public void enableNumImmutableMemTable() {
+		this.properties.add("rocksdb.num-immutable-mem-table");
 
 Review comment:
   all of this must be configurable via the `flink-conf.yaml` configuration.

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> 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)



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