deniskuzZ commented on code in PR #6020:
URL: https://github.com/apache/hive/pull/6020#discussion_r2278589972
##########
standalone-metastore/metastore-client/src/main/java/org/apache/hadoop/hive/metastore/utils/TableFetcher.java:
##########
@@ -102,21 +104,47 @@ public List<TableName> getTables() throws Exception {
List<String> databases = client.getDatabases(catalogName, dbPattern);
for (String db : databases) {
- Database database = client.getDatabase(catalogName, db);
- if (MetaStoreUtils.checkIfDbNeedsToBeSkipped(database)) {
- LOG.debug("Skipping table under database: {}", db);
- continue;
- }
- if (MetaStoreUtils.isDbBeingPlannedFailedOver(database)) {
- LOG.info("Skipping table that belongs to database {} being failed
over.", db);
- continue;
- }
- List<String> tablesNames = client.listTableNamesByFilter(catalogName,
db, tableFilter, -1);
+ List<String> tablesNames = getTableNamesForDatabase(catalogName, db);
tablesNames.forEach(tablesName ->
candidates.add(TableName.fromString(tablesName, catalogName, db)));
}
return candidates;
}
+ public List<Table> getTables(int maxBatchSize) throws Exception {
+ List<Table> candidates = new ArrayList<>();
+
+ // if tableTypes is empty, then a list with single empty string has to
specified to scan no tables.
+ if (tableTypes.isEmpty()) {
+ LOG.info("Table fetcher returns empty list as no table types specified");
+ return candidates;
+ }
+
+ List<String> databases = client.getDatabases(catalogName, dbPattern);
+
+ for (String db : databases) {
+ List<String> tablesNames = getTableNamesForDatabase(catalogName, db);
Review Comment:
@Neer393 I don't understand what have you optimized here.
You are still doing multiple calls: 1 to get table names and another to get
table objects. Why not get table objects directly?
Also, have you considered the memory impact when loading everything into the
heap? You could have iterated over TableIterable instead. I don't think that
is a robust solution, it can potentially lead to OOM.
cc @dengzhhu653, @wecharyu
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