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https://issues.apache.org/jira/browse/HADOOP-17028?focusedWorklogId=479133&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-479133
]
ASF GitHub Bot logged work on HADOOP-17028:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 04/Sep/20 14:27
Start Date: 04/Sep/20 14:27
Worklog Time Spent: 10m
Work Description: steveloughran commented on a change in pull request
#2260:
URL: https://github.com/apache/hadoop/pull/2260#discussion_r483645622
##########
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
Review comment:
nit: add a . to keep javadoc happy
##########
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;
Review comment:
nit, curly { }
##########
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:
this will dual init as thread #2 will block. You need another check
inside the sync block so the second thread won't repeat itself
##########
File path:
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/ViewFileSystem.java
##########
@@ -893,6 +906,9 @@ public short getDefaultReplication(Path f) {
return res.targetFileSystem.getDefaultReplication(res.remainingPath);
} catch (FileNotFoundException e) {
throw new NotInMountpointException(f, "getDefaultReplication");
+ } catch (IOException e) {
+ throw new RuntimeException("Not able to initialize fs in "
Review comment:
FYI. I've got a WrappedIOException, but in #2069 making it a public
`org.apache.hadoop.fs.functional.RuntimeIOException` whose cause is only ever
IOE. Not something to be picked up here (yet), but worth knowing. I'm trying to
make the functional & lambda/expression stuff more useable,
##########
File path:
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/ViewFileSystem.java
##########
@@ -855,7 +861,11 @@ public void setVerifyChecksum(final boolean
verifyChecksum) {
List<InodeTree.MountPoint<FileSystem>> mountPoints =
fsState.getMountPoints();
for (InodeTree.MountPoint<FileSystem> mount : mountPoints) {
- mount.target.targetFileSystem.setVerifyChecksum(verifyChecksum);
+ try {
+ mount.target.getTargetFileSystem().setVerifyChecksum(verifyChecksum);
+ } catch (IOException ex) {
+ LOG.error("Could not set verifyChecksum for source path " + mount.src);
+ }
Review comment:
log the full stack trace
##########
File path:
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/fs/viewfs/ViewFileSystem.java
##########
@@ -936,8 +956,13 @@ public void setWriteChecksum(final boolean writeChecksum) {
fsState.getMountPoints();
Set<FileSystem> children = new HashSet<FileSystem>();
for (InodeTree.MountPoint<FileSystem> mountPoint : mountPoints) {
- FileSystem targetFs = mountPoint.target.targetFileSystem;
- children.addAll(Arrays.asList(targetFs.getChildFileSystems()));
+ try {
+ FileSystem targetFs = mountPoint.target.getTargetFileSystem();
+ children.addAll(Arrays.asList(targetFs.getChildFileSystems()));
+ } catch (IOException ex) {
+ LOG.error("Could not add child filesystems "
+ + "for source path " + mountPoint.src);
Review comment:
+full exception log
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Issue Time Tracking
-------------------
Worklog Id: (was: 479133)
Time Spent: 1h 50m (was: 1h 40m)
> 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: 1h 50m
> 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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