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https://issues.apache.org/jira/browse/HDDS-3054?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
ASF GitHub Bot updated HDDS-3054:
---------------------------------
Labels: pull-request-available (was: )
> OzoneFileStatus#getModificationTime should return actual directory
> modification time when its OmKeyInfo is available
> --------------------------------------------------------------------------------------------------------------------
>
> Key: HDDS-3054
> URL: https://issues.apache.org/jira/browse/HDDS-3054
> Project: Hadoop Distributed Data Store
> Issue Type: Improvement
> Reporter: Siyao Meng
> Assignee: Siyao Meng
> Priority: Major
> Labels: pull-request-available
>
> As of current implementation,
> [{{getModificationTime()}}|https://github.com/apache/hadoop-ozone/blob/c9f26ccf9f93a052c5c0c042c57b6f87709597ae/hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/om/helpers/OzoneFileStatus.java#L90-L107]
> always returns "fake" modification time (current time) for directory due to
> the reason that a directory in Ozone might be faked from a file key.
> But, there are cases where real directory key exists in OzoneBucket. For
> example when user calls {{fs.mkdirs(directory)}}. In this case, a reasonable
> thing to do would be getting the modification time from the OmInfoKey, rather
> than faking it.
> CC [~xyao]
> My POC for the fix:
> {code:java|title=Diff}
> diff --git
> a/hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/om/helpers/OzoneFileStatus.java
>
> b/hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/om/helpers/OzoneFileStatus.java
> index 8717946512..708e62d692 100644
> ---
> a/hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/om/helpers/OzoneFileStatus.java
> +++
> b/hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/om/helpers/OzoneFileStatus.java
> @@ -93,7 +93,7 @@ public FileStatus makeQualified(URI defaultUri, Path parent,
> */
> @Override
> public long getModificationTime(){
> - if (isDirectory()) {
> + if (isDirectory() && super.getModificationTime() == 0) {
> return System.currentTimeMillis();
> } else {
> return super.getModificationTime();
> diff --git
> a/hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/KeyManagerImpl.java
>
> b/hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/KeyManagerImpl.java
> index 1be5fb3f3c..cb8f647a41 100644
> ---
> a/hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/KeyManagerImpl.java
> +++
> b/hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/KeyManagerImpl.java
> @@ -2004,8 +2004,14 @@ public OmKeyInfo lookupFile(OmKeyArgs args, String
> clientAddress)
> } else {
> // if entry is a directory
> if (!deletedKeySet.contains(entryInDb)) {
> - cacheKeyMap.put(entryInDb,
> - new OzoneFileStatus(immediateChild));
> + if (!entryKeyName.equals(immediateChild)) {
> + cacheKeyMap.put(entryInDb,
> + new OzoneFileStatus(immediateChild));
> + } else {
> + // If entryKeyName matches dir name, we have the info
> + cacheKeyMap.put(entryInDb,
> + new OzoneFileStatus(value, 0, true));
> + }
> countEntries++;
> }
> // skip the other descendants of this child directory.
> {code}
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