sadanand48 commented on code in PR #9079:
URL: https://github.com/apache/ozone/pull/9079#discussion_r2413900470
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hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/snapshot/SnapshotDiffManager.java:
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@@ -1180,6 +1199,37 @@ Set<String> getDeltaFiles(OmSnapshot fromSnapshot,
// TODO: [SNAPSHOT] Refactor the parameter list
Optional<Set<String>> deltaFiles = Optional.empty();
+ OmSnapshotLocalData fromSnapshotLocalData = getSnapshotLocalData(fsInfo);
+ int fromSnapshotVersion = fromSnapshotLocalData.getVersion();
+ OmSnapshotLocalData toSnapshotLocalData = getSnapshotLocalData(tsInfo);
+ int toSnapshotVersion = toSnapshotLocalData.getVersion();
+
+ try {
+ if (fromSnapshotVersion > 0 && toSnapshotVersion > 0) {
+ // both snapshots are defragmented, To calculate snap-diff, we can
simply compare the
+ // SST files contained in OmSnapshotLocalData instances of both these
and get the delta files
+ OmSnapshotLocalData.VersionMeta toSnapVersionMeta =
+
toSnapshotLocalData.getVersionSstFileInfos().get(toSnapshotVersion);
+ // get the source snapshot SST files (versionMeta) corresponding to
target snapshot
+ OmSnapshotLocalData.VersionMeta fromSnapVersionMeta =
+ resolveBaseVersionMeta(toSnapshotLocalData,
fromSnapshot.getSnapshotID());
+ // Calculate diff files using helper method
+ if (toSnapVersionMeta == null) {
+ String errMsg =
+ "Cannot find corresponding version of from snapshot " +
fromSnapshotVersion + " from " + tsInfo;
+ LOG.error(errMsg);
+ throw new IOException(errMsg);
+ }
+ List<String> diffFiles = calculateDiffFiles(fromSnapVersionMeta,
toSnapVersionMeta);
+ return OmSnapshotUtils.getSSTDiffListWithFullPath(diffFiles,
+
OmSnapshotManager.getSnapshotPath(ozoneManager.getMetadataManager(),
fsInfo).toString(),
+
OmSnapshotManager.getSnapshotPath(ozoneManager.getMetadataManager(),
tsInfo).toString(), diffDir);
+ }
+ } catch (Exception e) {
+ LOG.error("Failed to calculate snap-diff between fromSnapshot : {} ,
toSnapshot: {} via optimal method," +
+ "Falling back to other methods", fsInfo, tsInfo, e);
+ }
+
// Check if compaction DAG is available, use that if so
if (differ != null && fsInfo != null && tsInfo != null && !useFullDiff) {
Review Comment:
do we need to change DAG based diff code ? I think it already works on
version=0 files. If first if statement fails , this is the exact flow we have
today too. First DAG based diff is tried, if it fails it fallsback to full diff
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