swamirishi commented on code in PR #7193:
URL: https://github.com/apache/ozone/pull/7193#discussion_r1773677111
##########
hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/snapshot/SnapshotUtils.java:
##########
@@ -178,6 +180,40 @@ public static SnapshotInfo getNextSnapshot(OzoneManager
ozoneManager,
return null;
}
+ /**
+ * Get the previous snapshot in the snapshot chain.
+ */
+ public static SnapshotInfo getPreviousSnapshot(OzoneManager ozoneManager,
+ SnapshotChainManager
chainManager,
+ SnapshotInfo snapInfo)
+ throws IOException {
+ UUID previousSnapshotId = getPreviousSnapshotId(snapInfo, chainManager);
+ return previousSnapshotId == null ? null : getSnapshotInfo(ozoneManager,
chainManager, previousSnapshotId);
+ }
+
+ /**
+ * Get the previous snapshot in the snapshot chain.
+ */
+ private static UUID getPreviousSnapshotId(SnapshotInfo snapInfo,
SnapshotChainManager chainManager)
+ throws IOException {
+ // If the snapshot is deleted in the previous run, then the in-memory
+ // SnapshotChainManager might throw NoSuchElementException as the snapshot
+ // is removed in-memory but OMDoubleBuffer has not flushed yet.
+ if (snapInfo == null) {
+ throw new OMException("Snapshot Info is null. Cannot get the next
snapshot", INVALID_SNAPSHOT_ERROR);
+ }
+ try {
+ if (chainManager.hasPreviousPathSnapshot(snapInfo.getSnapshotPath(),
+ snapInfo.getSnapshotId())) {
+ return chainManager.previousPathSnapshot(snapInfo.getSnapshotPath(),
+ snapInfo.getSnapshotId());
+ }
+ } catch (NoSuchElementException ignored) {
+
Review Comment:
We need not log it since it is already logged inside hasPreviousPathSnapshot
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