From 45fcdaabc79abe6cd775b06a1951b2edc62f64cb Mon Sep 17 00:00:00 2001
From: yuxuan-luo <119841515+yuxuan-luo@users.noreply.github.com>
Date: Wed, 15 Mar 2023 09:56:24 +0800
Subject: [PATCH] [Bug](catalog) Fix fetching information_schema table timed
 out(#17692) (#17694)

Co-authored-by: hugoluo <hugoluo@tencent.com>
---
 .../org/apache/doris/datasource/CatalogIf.java     |  2 ++
 .../apache/doris/datasource/ExternalCatalog.java   | 14 ++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/fe/fe-core/src/main/java/org/apache/doris/datasource/CatalogIf.java b/fe/fe-core/src/main/java/org/apache/doris/datasource/CatalogIf.java
index 8647a00a8b..1f2777c87f 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/datasource/CatalogIf.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/datasource/CatalogIf.java
@@ -49,6 +49,8 @@ public interface CatalogIf<T extends DatabaseIf> {
 
     List<String> getDbNames();
 
+    // Will be used when querying the information_schema table
+    // Unable to get db for uninitialized catalog to avoid query timeout
     default List<String> getDbNamesOrEmpty() {
         try {
             return getDbNames();
diff --git a/fe/fe-core/src/main/java/org/apache/doris/datasource/ExternalCatalog.java b/fe/fe-core/src/main/java/org/apache/doris/datasource/ExternalCatalog.java
index 6f4ff316aa..4291c7b883 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/datasource/ExternalCatalog.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/datasource/ExternalCatalog.java
@@ -240,6 +240,20 @@ public abstract class ExternalCatalog implements CatalogIf<ExternalDatabase>, Wr
         return listDatabaseNames(null);
     }
 
+    @Override
+    public List<String> getDbNamesOrEmpty() {
+        if (initialized) {
+            try {
+                return getDbNames();
+            } catch (Exception e) {
+                LOG.warn("failed to get db names in catalog {}", getName(), e);
+                return Lists.newArrayList();
+            }
+        } else {
+            return Lists.newArrayList();
+        }
+    }
+
     @Override
     public String getResource() {
         return catalogProperty.getResource();