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https://issues.apache.org/jira/browse/YARN-10885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17577087#comment-17577087
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ASF GitHub Bot commented on YARN-10885:
---------------------------------------
slfan1989 commented on code in PR #4701:
URL: https://github.com/apache/hadoop/pull/4701#discussion_r940824886
##########
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/utils/FederationStateStoreFacade.java:
##########
@@ -376,10 +378,23 @@ public void updateApplicationHomeSubCluster(
*/
public SubClusterId getApplicationHomeSubCluster(ApplicationId appId)
throws YarnException {
- GetApplicationHomeSubClusterResponse response =
- stateStore.getApplicationHomeSubCluster(
+ try {
+ if (isCachingEnabled()) {
+ Object value =
+ cache.get(buildGetApplicationHomeSubClusterRequest(appId));
+ if (value instanceof SubClusterId) {
+ return (SubClusterId) value;
+ } else {
+ throw new YarnException("Cannot be converted to SubClusterId.");
Review Comment:
This part of the code does need cast, I simplified the code.
The main reasons are as follows:
The key and value used by the Cache defined here are both Object types.
```
private Cache<Object, Object> cache;
```
##########
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/federation/utils/FederationStateStoreFacade.java:
##########
@@ -376,10 +378,23 @@ public void updateApplicationHomeSubCluster(
*/
public SubClusterId getApplicationHomeSubCluster(ApplicationId appId)
throws YarnException {
- GetApplicationHomeSubClusterResponse response =
- stateStore.getApplicationHomeSubCluster(
+ try {
+ if (isCachingEnabled()) {
+ Object value =
+ cache.get(buildGetApplicationHomeSubClusterRequest(appId));
+ if (value instanceof SubClusterId) {
+ return (SubClusterId) value;
+ } else {
+ throw new YarnException("Cannot be converted to SubClusterId.");
Review Comment:
This part of the code does need cast, I simplified the code.
The main reasons are as follows:
The key and value used by the Cache defined here are both Object types.
```
private Cache<Object, Object> cache;
```
> Make FederationStateStoreFacade#getApplicationHomeSubCluster use JCache
> -----------------------------------------------------------------------
>
> Key: YARN-10885
> URL: https://issues.apache.org/jira/browse/YARN-10885
> Project: Hadoop YARN
> Issue Type: Improvement
> Reporter: chaosju
> Assignee: fanshilun
> Priority: Major
> Labels: pull-request-available
> Time Spent: 2h 20m
> Remaining Estimate: 0h
>
> Yarn Client getApplicationReport function may produce lots of zookeeper ops,
> Its import to use the JCache that cache the mapping of application and
> subcluster id.
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