Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7839#discussion_r36252740
--- Diff:
network/yarn/src/main/java/org/apache/spark/network/yarn/YarnShuffleService.java
---
@@ -181,4 +249,38 @@ public ByteBuffer getMetaData() {
return ByteBuffer.allocate(0);
}
+ private Map<String, List<Entry<AppExecId, ExecutorShuffleInfo>>>
reloadRegisteredExecutors()
+ throws IOException, ClassNotFoundException {
+ if (registeredExecutorFile != null && registeredExecutorFile.exists())
{
+ logger.info("Reloading executors from {}", registeredExecutorFile);
+ return reloadRegisteredExecutors(registeredExecutorFile);
+ } else {
+ logger.info("No executor info to reload");
+ return new HashMap<>();
+ }
+ }
+
+
+ @VisibleForTesting
+ static Map<String, List<Entry<AppExecId, ExecutorShuffleInfo>>>
reloadRegisteredExecutors(
+ File file
+ ) throws IOException, ClassNotFoundException {
+ Map<String, List<Entry<AppExecId, ExecutorShuffleInfo>>> result = new
HashMap<>();
+ ObjectInputStream in = new ObjectInputStream(new
FileInputStream(file));
+ Map<AppExecId, ExecutorShuffleInfo> registeredExecutors =
+ (Map<AppExecId, ExecutorShuffleInfo>) in.readObject();
+ for (Entry<AppExecId, ExecutorShuffleInfo> e:
registeredExecutors.entrySet()) {
+ List<Map.Entry<AppExecId, ExecutorShuffleInfo>> executorsForApp =
+ result.get(e.getKey().appId);
+ if (executorsForApp == null) {
+ executorsForApp = new ArrayList<>();
+ result.put(e.getKey().appId, executorsForApp);
+ }
+ executorsForApp.add(new
AbstractMap.SimpleImmutableEntry<>(e.getKey(), e.getValue()));
+ }
+ in.close();
--- End diff --
This needs to be in a `finally` block.
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