rakeshadr commented on a change in pull request #1503:
URL: https://github.com/apache/hadoop-ozone/pull/1503#discussion_r512452877
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File path:
hadoop-ozone/ozone-manager/src/main/java/org/apache/hadoop/ozone/om/KeyManagerImpl.java
##########
@@ -2205,6 +2276,318 @@ private void listStatusFindKeyInTableCache(
return fileStatusList;
}
+ public List<OzoneFileStatus> listStatusV1(OmKeyArgs args, boolean recursive,
+ String startKey, long numEntries, String clientAddress)
+ throws IOException {
+ Preconditions.checkNotNull(args, "Key args can not be null");
+
+ // unsorted OMKeyInfo list contains combine results from TableCache and DB.
+ List<OzoneFileStatus> fileStatusFinalList = new ArrayList<>();
+ LinkedHashSet<OzoneFileStatus> fileStatusList = new LinkedHashSet<>();
+ if (numEntries <= 0) {
+ return fileStatusFinalList;
+ }
+
+ String volumeName = args.getVolumeName();
+ String bucketName = args.getBucketName();
+ String keyName = args.getKeyName();
+ String seekFileInDB;
+ String seekDirInDB;
+ long prefixKeyInDB;
+ String prefixPath = keyName;
+
+ int countEntries = 0;
+
+ metadataManager.getLock().acquireReadLock(BUCKET_LOCK, volumeName,
+ bucketName);
+ try {
+ if (Strings.isNullOrEmpty(startKey)) {
+ OzoneFileStatus fileStatus = getFileStatus(args, clientAddress);
+ if (fileStatus.isFile()) {
+ return Collections.singletonList(fileStatus);
+ }
+
+ // Not required to search in DeletedTable because all the deleted
+ // keys will be marked directly in dirTable or in keyTable by
+ // breaking the pointer to its sub-dirs. So, there is no issue of
+ // inconsistency.
+
+ /*
+ * keyName is a directory.
+ * Say, "/a" is the dir name and its objectID is 1024, then seek
+ * will be doing with "1024/" to get all immediate descendants.
+ */
+ if (fileStatus.getKeyInfo() != null) {
+ prefixKeyInDB = fileStatus.getKeyInfo().getObjectID();
+ } else {
+ // list root directory.
+ String bucketKey = metadataManager.getBucketKey(volumeName,
+ bucketName);
+ OmBucketInfo omBucketInfo =
+ metadataManager.getBucketTable().get(bucketKey);
+ prefixKeyInDB = omBucketInfo.getObjectID();
+ }
+ seekFileInDB = metadataManager.getOzonePathKey(prefixKeyInDB, "");
+ seekDirInDB = metadataManager.getOzonePathKey(prefixKeyInDB, "");
+
+ // TODO: recursive flag=true will be handled in HDDS-4360 jira.
+ // Order of seek -> (1)Seek dirs in dirTable (2)Seek files in fileTable
+ // 1. Seek the given key in key table.
+ countEntries = getFilesFromDirectory(fileStatusList, seekFileInDB,
+ prefixPath, prefixKeyInDB, startKey, countEntries, numEntries);
+ // 2. Seek the given key in dir table.
+ getDirectories(recursive, startKey, numEntries, fileStatusList,
+ volumeName, bucketName, seekDirInDB, prefixKeyInDB,
+ prefixPath, countEntries);
+ } else {
+ /*
+ * startKey will be used in iterator seek and sets the beginning point
+ * for key traversal.
+ *
+ * key name will be used as parentID where the user has requested to
+ * list the keys from.
+ *
+ * When recursive flag=false, parentID won't change between two pages.
+ * For example: OM has a namespace like,
+ * /a/1...1M files and /a/b/1...1M files.
+ * /a/1...1M directories and /a/b/1...1M directories.
+ * Listing "/a", will always have the parentID as "a" irrespective of
+ * the startKey value.
+ */
+ // TODO: recursive flag=true will be handled in HDDS-4360 jira.
+ OzoneFileStatus fileStatusInfo = getOzoneFileStatusV1(volumeName,
+ bucketName, startKey, false, null, true);
+
+ if (fileStatusInfo != null) {
+ prefixKeyInDB = fileStatusInfo.getKeyInfo().getParentObjectID();
+ if(fileStatusInfo.isDirectory()){
+ seekDirInDB = metadataManager.getOzonePathKey(prefixKeyInDB,
+ fileStatusInfo.getKeyInfo().getFileName());
+
+ // Order of seek -> (1) Seek dirs in dirTable. In OM, always the
+ // order of search is, first seek into fileTable and then dirTable.
+ // So, its not required to search again into the fileTable.
+
+ // Seek the given key in dirTable.
+ getDirectories(recursive, startKey, numEntries,
+ fileStatusList, volumeName, bucketName, seekDirInDB,
+ prefixKeyInDB, prefixPath, countEntries);
+
+ } else {
+ seekFileInDB = metadataManager.getOzonePathKey(prefixKeyInDB,
Review comment:
As we have to perform seek in two tables to finish the listing, I'm
maintaining a seek order
1) Finish listing all the files from FileTable, then
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