[GitHub] sijie commented on a change in pull request #210: Issue 209: Support rename log

[GitBox <gi...@apache.org>]

sijie commented on a change in pull request #210: Issue 209: Support rename log
URL: https://github.com/apache/distributedlog/pull/210#discussion_r145556801
 
 

 ##########
 File path: distributedlog-core/src/main/java/org/apache/distributedlog/impl/metadata/ZKLogStreamMetadataStore.java
 ##########
 @@ -620,4 +631,271 @@ public void processResult(int rc, String path, Object ctx) {
         }
         return promise;
     }
+
+    //
+    // Rename Log
+    //
+
+    @Override
+    public CompletableFuture<Void> renameLog(URI uri, String oldStreamName, String newStreamName) {
+        return getLog(
+            uri,
+            oldStreamName,
+            true,
+            false
+        ).thenCompose(metadata -> renameLogMetadata(uri, metadata, newStreamName));
+    }
+
+    private CompletableFuture<Void> renameLogMetadata(URI uri,
+                                                      LogMetadataForWriter oldMetadata,
+                                                      String newStreamName) {
+
+
+        final LinkedList<Op> createOps = Lists.newLinkedList();
+        final LinkedList<Op> deleteOps = Lists.newLinkedList();
+
+        List<ACL> acls = zooKeeperClient.getDefaultACL();
+
+        // get the root path
+        String oldRootPath = oldMetadata.getLogRootPath();
+        String newRootPath = LogMetadata.getLogRootPath(
+            uri, newStreamName, conf.getUnpartitionedStreamName());
+
+        // 0. the log path
+        deleteOps.addFirst(Op.delete(
+            LogMetadata.getLogStreamPath(uri, oldMetadata.getLogName()), -1));
+
+        // 1. the root path
+        createOps.addLast(Op.create(
+            newRootPath, EMPTY_BYTES, acls, CreateMode.PERSISTENT));
+        deleteOps.addFirst(Op.delete(
+            oldRootPath, -1));
+
+        // 2. max id
+        Versioned<byte[]> maxTxIdData = oldMetadata.getMaxTxIdData();
+        deleteOldPathAndCreateNewPath(
+            oldRootPath, MAX_TXID_PATH, maxTxIdData,
+            newRootPath, DLUtils.serializeTransactionId(0L), acls,
+            createOps, deleteOps
+        );
+
+        // 3. version
+        createOps.addLast(Op.create(
+            newRootPath + VERSION_PATH, intToBytes(LAYOUT_VERSION), acls, CreateMode.PERSISTENT));
+        deleteOps.addFirst(Op.delete(
+            oldRootPath + VERSION_PATH, -1));
+
+        // 4. lock path (NOTE: if the stream is locked by a writer, then the delete will fail as you can not
 
 Review comment:
   done

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