simbadzina commented on code in PR #6208:
URL: https://github.com/apache/hadoop/pull/6208#discussion_r1394778522
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hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/router/RouterRpcClient.java:
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@@ -772,13 +780,22 @@ public static boolean isUnavailableException(IOException
ioe) {
* Check if the cluster of given nameservice id is available.
*
* @param nsId nameservice ID.
+ * @param namenode namenode context.
+ * @param listObserverFirst Observer read case, observer NN will be ranked
first.
* @return true if the cluster with given nameservice id is available.
* @throws IOException if error occurs.
*/
- private boolean isClusterUnAvailable(String nsId) throws IOException {
+ private boolean isClusterUnAvailable(
+ String nsId, FederationNamenodeContext namenode,
+ boolean listObserverFirst) throws IOException {
+ // Use observer and the namenode that causes the exception is an observer,
+ // false is returned so that the observer can be marked as unavailable,so
other observers
+ // or active namenode which is standby in the cache of the router can be
retried.
Review Comment:
This comment is a bit confusing to read. Maybe the following could make it
clearer
```
If the operation is an observer read and the namenode that caused the
exception is an observer ...
```
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