szetszwo commented on a change in pull request #2165:
URL: https://github.com/apache/hadoop/pull/2165#discussion_r463146771
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File path:
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
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@@ -7166,6 +7178,30 @@ void deleteSnapshot(String snapshotRoot, String
snapshotName,
logAuditEvent(true, operationName, rootPath, null, null);
}
+ public void gcDeletedSnapshot(String snapshotRoot, String snapshotName)
+ throws IOException {
+ final String operationName = "gcDeletedSnapshot";
+ String rootPath = null;
+ final INode.BlocksMapUpdateInfo blocksToBeDeleted;
+
+ checkOperation(OperationCategory.WRITE);
+ writeLock();
+ try {
+ checkOperation(OperationCategory.WRITE);
+ rootPath = Snapshot.getSnapshotPath(snapshotRoot, snapshotName);
+ checkNameNodeSafeMode("Cannot gcDeletedSnapshot for " + rootPath);
+
+ final long now = Time.now();
+ final INodesInPath iip = dir.resolvePath(null, snapshotRoot,
DirOp.WRITE);
+ snapshotManager.assertMarkedAsDeleted(iip, snapshotName);
+ blocksToBeDeleted = FSDirSnapshotOp.deleteSnapshot(
+ dir, snapshotManager, iip, snapshotName, now);
+ } finally {
+ writeUnlock(operationName, getLockReportInfoSupplier(rootPath));
+ }
+ removeBlocks(blocksToBeDeleted);
Review comment:
No. blocksToBeDeleted is never null.
The statement "if (blocksToBeDeleted != null)" in
FsNamesystem#deleteSnapshot actually generates a warning in IntelIJ saying that
"the condition blocksToBeDeleted != null is always true".
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