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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