slfan1989 commented on code in PR #9065:
URL: https://github.com/apache/hudi/pull/9065#discussion_r1244702211
##########
hudi-client/hudi-client-common/src/main/java/org/apache/hudi/config/HoodieMemoryConfig.java:
##########
@@ -140,7 +144,9 @@ private HoodieMemoryConfig() {
public static String getDefaultSpillableMapBasePath() {
String[] localDirs = FileIOUtils.getConfiguredLocalDirs();
- return (localDirs != null && localDirs.length > 0) ? localDirs[0] :
"/tmp/";
+ List<String> localDirLists = Arrays.asList(localDirs);
+ Collections.shuffle(localDirLists);
+ return !localDirLists.isEmpty() ? localDirLists.get(0) : "/tmp/";
Review Comment:
Thank you very much for helping with the code review! `LOCAL_DIRS` is an
environment variable set by YARN during Container startup, taking into
consideration disk space availability and cases where a disk may be
inaccessible.
- Hudi#FileIOUtils#getYarnLocalDirs
```
private static String getYarnLocalDirs() {
String localDirs = System.getenv("LOCAL_DIRS");
if (localDirs == null) {
throw new HoodieIOException("Yarn Local dirs can't be empty");
}
return localDirs;
}
```
- YARN
ContainerLaunch#call
```
// dirsHandler is LocalDirsHandlerService
List<String> localDirs = dirsHandler.getLocalDirs();
List<String> containerLocalDirs = getContainerLocalDirs(localDirs);
if (truststore != null) {
addTruststoreVars(environment, containerWorkDir);
}
prepareContainer(localResources, containerLocalDirs);
// Write out the environment
exec.writeLaunchEnv(containerScriptOutStream, environment,
localResources, launchContext.getCommands(), containerLogDir, user,
nmEnvVars);
```
ContainerLaunch#prepareContainer
```
protected List<String> getContainerLocalDirs(List<String> localDirs) {
List<String> containerLocalDirs = new ArrayList<>(localDirs.size());
String user = container.getUser();
String appIdStr = app.getAppId().toString();
String relativeContainerLocalDir = ContainerLocalizer.USERCACHE
+ Path.SEPARATOR + user + Path.SEPARATOR +
ContainerLocalizer.APPCACHE
+ Path.SEPARATOR + appIdStr + Path.SEPARATOR;
for (String localDir : localDirs) {
containerLocalDirs.add(localDir + Path.SEPARATOR
+ relativeContainerLocalDir);
}
return containerLocalDirs;
}
```
LocalDirsHandlerService#getLocalDirs
```
public List<String> getLocalDirs() {
return localDirs.getGoodDirs();
}
```
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