junkaixue commented on code in PR #2805:
URL: https://github.com/apache/helix/pull/2805#discussion_r1633641222
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meta-client/src/main/java/org/apache/helix/metaclient/impl/zk/ZkMetaClient.java:
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@@ -207,16 +208,55 @@ public void set(String key, T data, int version) {
@Override
public T update(String key, DataUpdater<T> updater) {
- org.apache.zookeeper.data.Stat stat = new org.apache.zookeeper.data.Stat();
- // TODO: add retry logic for ZkBadVersionException.
- try {
- T oldData = _zkClient.readData(key, stat);
- T newData = updater.update(oldData);
- set(key, newData, stat.getVersion());
- return newData;
- } catch (ZkException e) {
- throw translateZkExceptionToMetaclientException(e);
- }
+ return update(key, updater, false);
+ }
+
+ @Override
+ public T update(String key, DataUpdater<T> updater, boolean retryOnFailure) {
+ final int MAX_RETRY_ATTEMPTS = 3;
+ int retryAttempts = 0;
+ boolean retry;
+ T updatedData = null;
+ do {
+ retry = false;
+ retryAttempts++;
+ try {
+ ImmutablePair<T, Stat> tup = getDataAndStat(key);
+ Stat stat = tup.right;
+ T oldData = tup.left;
+ T newData = updater.update(oldData);
+ set(key, newData, stat.getVersion());
+ updatedData = newData;
+ } catch (MetaClientBadVersionException badVersionException) {
+ // If exceeded max retry attempts, re-throw exception
+ if (retryAttempts >= MAX_RETRY_ATTEMPTS) {
+ LOG.error("Failed to update node at " + key + " after " +
MAX_RETRY_ATTEMPTS + " attempts.");
+ throw badVersionException;
+ }
+ // Retry on bad version
+ retry = true;
+ } catch (MetaClientNoNodeException noNodeException) {
+ // If node does not exist, attempt to create it - pass null to updater
+ T newData = updater.update(null);
+ if (newData != null) {
+ try {
+ create(key, newData);
Review Comment:
I am also thinking of no creation. If this is update, it supposed to be
updating something was there. It has the possibility that the node just be
deleted recursively before update. Then update should be an invalidate
operation and fail.
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