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https://issues.apache.org/jira/browse/HADOOP-17028?focusedWorklogId=605543&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-605543
]
ASF GitHub Bot logged work on HADOOP-17028:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 02/Jun/21 20:49
Start Date: 02/Jun/21 20:49
Worklog Time Spent: 10m
Work Description: abhishekdas99 commented on a change in pull request
#2260:
URL: https://github.com/apache/hadoop/pull/2260#discussion_r644310547
##########
File path:
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/InodeTree.java
##########
@@ -284,7 +288,20 @@ boolean isInternalDir() {
return false;
}
- public T getTargetFileSystem() {
+ /**
+ * Gets lazily loaded instance of FileSystem
+ * @return An Initialized instance of T
+ * @throws IOException
+ */
+ public T getTargetFileSystem() throws IOException {
+ if (targetFileSystem != null)
+ return targetFileSystem;
+
+ if (targetDirLinkList.length == 1) {
+ synchronized (this) {
+ targetFileSystem = fileSystemInitFunc.apply(targetDirLinkList[0]);
Review comment:
Added extra check
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Issue Time Tracking
-------------------
Worklog Id: (was: 605543)
Time Spent: 2h 40m (was: 2.5h)
> ViewFS should initialize target filesystems lazily
> --------------------------------------------------
>
> Key: HADOOP-17028
> URL: https://issues.apache.org/jira/browse/HADOOP-17028
> Project: Hadoop Common
> Issue Type: Bug
> Components: client-mounts, fs, viewfs
> Affects Versions: 3.2.1
> Reporter: Uma Maheswara Rao G
> Assignee: Abhishek Das
> Priority: Major
> Labels: pull-request-available
> Time Spent: 2h 40m
> Remaining Estimate: 0h
>
> Currently viewFS initialize all configured target filesystems when
> viewfs#init itself.
> Some target file system initialization involve creating heavy objects and
> proxy connections. Ex: DistributedFileSystem#initialize will create DFSClient
> object which will create proxy connections to NN etc.
> For example: if ViewFS configured with 10 target fs with hdfs uri and 2
> targets with s3a.
> If one of the client only work with s3a target, But ViewFS will initialize
> all targets irrespective of what clients interested to work with. That means,
> here client will create 10 DFS initializations and 2 s3a initializations. Its
> unnecessary to have DFS initialization here. So, it will be a good idea to
> initialize the target fs only when first time usage call come to particular
> target fs scheme.
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