sankarh commented on a change in pull request #551: HIVE-21286: Hive should
support clean-up of previously bootstrapped tables when retry from different
dump.
URL: https://github.com/apache/hive/pull/551#discussion_r262345212
##########
File path: ql/src/java/org/apache/hadoop/hive/ql/exec/repl/ReplLoadTask.java
##########
@@ -279,6 +292,72 @@ a database ( directory )
return 0;
}
+ /**
+ * Cleanup/drop tables from the given database which are bootstrapped by
input dump dir.
+ * @throws HiveException Failed to drop the tables.
+ * @throws IOException File operations failure.
+ * @throws InvalidInputException Invalid input dump directory.
+ */
+ private void bootstrapRollbackTask() throws HiveException, IOException,
InvalidInputException {
+ Path bootstrapDirectory = new PathBuilder(work.bootstrapDumpToRollback)
+ .addDescendant(ReplUtils.INC_BOOTSTRAP_ROOT_DIR_NAME).build();
+ FileSystem fs = bootstrapDirectory.getFileSystem(conf);
+
+ if (!fs.exists(bootstrapDirectory)) {
+ throw new InvalidInputException("Input bootstrap dump directory to
rollback doesn't exist: "
+ + bootstrapDirectory);
+ }
+
+ FileStatus[] fileStatuses = fs.listStatus(bootstrapDirectory,
EximUtil.getDirectoryFilter(fs));
+ if ((fileStatuses == null) || (fileStatuses.length == 0)) {
+ throw new InvalidInputException("Input bootstrap dump directory to
rollback is empty: "
+ + bootstrapDirectory);
+ }
+
+ if (StringUtils.isNotBlank(work.dbNameToLoadIn) && (fileStatuses.length >
1)) {
+ throw new InvalidInputException("Multiple DB dirs in the dump: " +
bootstrapDirectory
+ + " is not allowed to load to single target DB: " +
work.dbNameToLoadIn);
+ }
+
+ for (FileStatus dbDir : fileStatuses) {
+ Path dbLevelPath = dbDir.getPath();
+ String dbNameInDump = dbLevelPath.getName();
+
+ List<String> tableNames = new ArrayList<>();
+ RemoteIterator<LocatedFileStatus> filesIterator =
fs.listFiles(dbLevelPath, true);
+ while (filesIterator.hasNext()) {
+ Path nextFile = filesIterator.next().getPath();
+ String filePath = nextFile.toString();
+ if (filePath.endsWith(EximUtil.METADATA_NAME)) {
+ // Remove dbLevelPath from the current path to check if this
_metadata file is under DB or
+ // table level directory.
+ String replacedString = filePath.replace(dbLevelPath.toString(), "");
+ if (!replacedString.equalsIgnoreCase(EximUtil.METADATA_NAME)) {
+ tableNames.add(nextFile.getParent().getName());
+ }
+ }
+ }
+
+ // No tables listed in the DB level directory to be dropped.
+ if (tableNames.isEmpty()) {
+ LOG.info("No tables are listed to be dropped for Database: {} in
bootstrap dump: {}",
+ dbNameInDump, bootstrapDirectory);
+ continue;
+ }
+
+ // Drop all tables bootstrapped from previous dump.
+ // Get the target DB in which previously bootstrapped tables to be
dropped. If user specified
+ // DB name as input in REPL LOAD command, then use it.
+ String dbName = (StringUtils.isNotBlank(work.dbNameToLoadIn) ?
work.dbNameToLoadIn : dbNameInDump);
+
+ Hive db = getHive();
+ for (String table : tableNames) {
+ db.dropTable(dbName + "." + table, true);
Review comment:
That's not a problem. It is expected behaviour for external tables where
Hive shouldn't delete those directories. Even in source these directories will
remain there but the table would be dropped. Also, if the same table is found
in new bootstrap dump, then it will avoid re-copying those file again.
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