Tejaskriya commented on code in PR #8016:
URL: https://github.com/apache/ozone/pull/8016#discussion_r2057708586
##########
hadoop-hdds/rocksdb-checkpoint-differ/src/main/java/org/apache/ozone/rocksdiff/RocksDBCheckpointDiffer.java:
##########
@@ -758,22 +681,27 @@ public void loadAllCompactionLogs() {
synchronized (this) {
preconditionChecksForLoadAllCompactionLogs();
addEntriesFromLogFilesToDagAndCompactionLogTable();
Review Comment:
Added to the java doc for `loadAllCompactionLogs()`
##########
hadoop-hdds/rocksdb-checkpoint-differ/src/main/java/org/apache/ozone/rocksdiff/CompactionDag.java:
##########
@@ -0,0 +1,155 @@
+/*
+ * 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.ozone.rocksdiff;
+
+import com.google.common.graph.GraphBuilder;
+import com.google.common.graph.MutableGraph;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+import org.apache.ozone.compaction.log.CompactionFileInfo;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Helper methods for creating compaction DAGs.
+ */
+public class CompactionDag {
+ private static final Logger LOG =
LoggerFactory.getLogger(CompactionDag.class);
+
+ private final ConcurrentMap<String, CompactionNode> compactionNodeMap = new
ConcurrentHashMap<>();
+ private final MutableGraph<CompactionNode> forwardCompactionDAG =
GraphBuilder.directed().build();
+ private final MutableGraph<CompactionNode> backwardCompactionDAG =
GraphBuilder.directed().build();
+
+ private CompactionNode addNodeToDAG(String file, long seqNum, String
startKey, String endKey, String columnFamily) {
+ CompactionNode fileNode = new CompactionNode(file, seqNum, startKey,
endKey, columnFamily);
+ backwardCompactionDAG.addNode(fileNode);
+ forwardCompactionDAG.addNode(fileNode);
+ return fileNode;
+ }
+
+ /**
+ * Populate the compaction DAG with input and output SST files lists.
+ *
+ * @param inputFiles List of compaction input files.
+ * @param outputFiles List of compaction output files.
+ * @param seqNum DB transaction sequence number.
+ */
+ public void populateCompactionDAG(List<CompactionFileInfo> inputFiles,
+ List<CompactionFileInfo> outputFiles,
+ long seqNum) {
+
+ if (LOG.isDebugEnabled()) {
+ LOG.debug("Input files: {} -> Output files: {}", inputFiles,
outputFiles);
+ }
+
+ for (CompactionFileInfo outfile : outputFiles) {
+ final CompactionNode outfileNode =
compactionNodeMap.computeIfAbsent(outfile.getFileName(),
+ file -> addNodeToDAG(file, seqNum, outfile.getStartKey(),
outfile.getEndKey(), outfile.getColumnFamily()));
+
+ for (CompactionFileInfo infile : inputFiles) {
+ final CompactionNode infileNode =
compactionNodeMap.computeIfAbsent(infile.getFileName(),
+ file -> addNodeToDAG(file, seqNum, infile.getStartKey(),
infile.getEndKey(), infile.getColumnFamily()));
+
+ // Draw the edges
+ if (!Objects.equals(outfileNode.getFileName(),
infileNode.getFileName())) {
+ forwardCompactionDAG.putEdge(outfileNode, infileNode);
+ backwardCompactionDAG.putEdge(infileNode, outfileNode);
+ }
+ }
+ }
+ }
+
+ public Set<String> pruneNodesFromDag(Set<CompactionNode> nodesToRemove) {
+ pruneBackwardDag(backwardCompactionDAG, nodesToRemove);
+ Set<String> sstFilesPruned = pruneForwardDag(forwardCompactionDAG,
nodesToRemove);
+ // Remove SST file nodes from compactionNodeMap too,
+ // since those nodes won't be needed after clean up.
+ nodesToRemove.forEach(compactionNodeMap::remove);
+ return sstFilesPruned;
+ }
+
+ /**
+ * Prunes backward DAG's upstream from the level, that needs to be removed.
+ */
+ Set<String> pruneBackwardDag(MutableGraph<CompactionNode> backwardDag,
+ Set<CompactionNode> startNodes) {
+ Set<String> removedFiles = new HashSet<>();
+ Set<CompactionNode> currentLevel = startNodes;
+
+ synchronized (this) {
Review Comment:
We have the following synchronized block in
RocksDBCheckpointDiffer#pruneSstFileNodesFromDag
```
synchronized (this) {
return compactionDag.pruneNodesFromDag(startNodes);
}
```
I have removed the synchronized blocks present in CompactionDag now
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