sadanand48 commented on code in PR #10821:
URL: https://github.com/apache/ozone/pull/10821#discussion_r3619736513
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hadoop-hdds/rocksdb-checkpoint-differ/src/main/java/org/apache/ozone/rocksdiff/RocksDBCheckpointDiffer.java:
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@@ -1161,6 +1162,46 @@ private synchronized void
removeKeyFromCompactionLogTable(
}
}
+ /**
+ * Removes SST files from the backup directory that were hard-linked during
+ * {@code onCompactionBegin} but never recorded in the compaction log because
+ * the compaction did not complete (for example, due to an OM crash/restart).
+ */
+ @VisibleForTesting
+ void cleanupOrphanedSstBackupFiles() {
+ Path sstBackupDirPath = Paths.get(sstBackupDir);
+ if (!Files.isDirectory(sstBackupDirPath)) {
+ return;
+ }
+
+ Set<String> referencedFiles = compactionDag.getCompactionMap().keySet();
+ Set<String> orphanedFiles = new HashSet<>();
+ try (Stream<Path> pathStream = Files.list(sstBackupDirPath)) {
+ pathStream.filter(path -> path.getFileName().toString().toLowerCase()
+ .endsWith(SST_FILE_EXTENSION))
+ .forEach(path -> {
+ String fileName =
FilenameUtils.getBaseName(path.getFileName().toString());
+ if (!referencedFiles.contains(fileName)) {
+ orphanedFiles.add(fileName);
+ }
+ });
+ } catch (IOException e) {
+ LOG.warn("Failed to list SST backup directory " + sstBackupDir, e);
+ }
+
+ if (orphanedFiles.isEmpty()) {
+ return;
+ }
+
+ LOG.info("Removing orphaned SST backup files left by incomplete
compactions: {}",
+ orphanedFiles);
+ try (UncheckedAutoCloseable ignored =
getBootstrapStateLock().acquireReadLock()) {
Review Comment:
read lock because no other thread is going to read the orphaned files? I
guess bootstrap process also copies only the referenced SST's right
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