okumin commented on code in PR #6020:
URL: https://github.com/apache/hive/pull/6020#discussion_r2280285708
##########
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:
Let me summarize the points.
- This PR would reduce # of API calls from O(num-tables) to O(num-tables /
batch size). It's neat 👍
- This PR would require the O(num-tables * tbl-size) space. We'd like to
reduce it
- Regardless of this PR, we retain the O(num-tables * length-of-table-name)
space. Is it OK or should we optimize it?
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