smengcl commented on code in PR #4045:
URL: https://github.com/apache/ozone/pull/4045#discussion_r1049087825
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hadoop-hdds/rocksdb-checkpoint-differ/src/main/java/org/apache/ozone/rocksdiff/RocksDBCheckpointDiffer.java:
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@@ -939,6 +978,114 @@ private void populateCompactionDAG(List<String>
inputFiles,
}
+ /**
+ * This is the task definition which is run periodically by the service
+ * executor at fixed delay.
+ * It looks for snapshots in compaction DAG which are older than the allowed
+ * time to be in compaction DAG and removes them from the DAG.
+ */
+ public void pruneOlderSnapshotsWithCompactionHistory() {
+ String snapshotDir = null;
+ long currentTimeMillis = System.currentTimeMillis();
+
+ while (!snapshots.isEmpty() &&
+ (currentTimeMillis - snapshots.peek().getLeft())
+ > maxAllowedTimeInDag) {
+ snapshotDir = snapshots.poll().getRight();
+ }
+
+ if (snapshotDir != null) {
+ pruneSnapshotFileNodesFromDag(snapshotDir);
+ }
+ }
+
+ /**
+ * Prunes forward and backward DAGs when oldest snapshot with compaction
+ * history gets deleted.
+ */
+ public void pruneSnapshotFileNodesFromDag(String snapshotDir) {
+ Set<String> snapshotSstFiles = readRocksDBLiveFiles(snapshotDir);
Review Comment:
Good point. This is a valid concern. We might have to read compaction log
entries then. Either write the list of SSTs into the compaction log snapshot
entry, or ask @sadanand48 's pruning thread to leave a note of the SST list
before pruning happens and use that.
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