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https://issues.apache.org/jira/browse/HDFS-13453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16439668#comment-16439668
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Íñigo Goiri commented on HDFS-13453:
------------------------------------
Internally, we had:
{code}
private Map<String, Long> getMountPointDates(String path) {
Map<String, Long> ret = new TreeMap<>();
if (subclusterResolver instanceof MountTableResolver) {
try {
MountTableResolver mountTable = (MountTableResolver)subclusterResolver;
List<MountTable> entries = mountTable.getMounts(path);
for (MountTable entry : entries) {
String srcPath = entry.getSourcePath();
long modTime = entry.getDateModified();
// Remove the suffix
srcPath = srcPath.substring(path.length());
int index = srcPath.indexOf("/");
if (index > 0) {
srcPath = srcPath.substring(0, index);
}
// Remove the / in the beginning
if (srcPath.startsWith("/")) {
srcPath = srcPath.substring(1);
}
// Get the latest date
Long prevTime = ret.get(srcPath);
if (prevTime == null || prevTime < modTime) {
ret.put(srcPath, modTime);
}
}
} catch (IOException ioe) {
LOG.error("Cannot get mount table entries", ioe);
}
}
return ret;
}
{code}
I think that [^HDFS-13453-001.patch] goes even a little further.
You may want to extract the variable and do a merge of these two approaches.
> RBF: getMountPointDates should fetch latest subdir time/date when parent dir
> is not present but /parent/child dirs are present in mount table
> ---------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-13453
> URL: https://issues.apache.org/jira/browse/HDFS-13453
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Dibyendu Karmakar
> Assignee: Dibyendu Karmakar
> Priority: Major
> Attachments: HDFS-13453-000.patch, HDFS-13453-001.patch
>
>
> [HDFS-13386|https://issues.apache.org/jira/browse/HDFS-13386] is not handling
> the case when /parent in not present in mount table but /parent/subdir is in
> mount table.
> In this case getMountPointDates is not able to fetch the latest time for
> /parent as /parent is not present in mount table.
> For this scenario we will display latest modified subdir date/time as /parent
> modified time.
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