[improvement](detailMessage) add AvailCapacity prompt in detailMessage (#26328)

Co-authored-by: xingying01 <xingying01@corp.netease.com>

fe/fe-core/src/main/java/org/apache/doris/system/SystemInfoService.java

@@ -593,7 +593,8 @@ public class SystemInfoService {
             if (!failedEntries.isEmpty()) {
                 String failedMsg = Joiner.on("\n").join(failedEntries);
                 throw new DdlException("Failed to find enough backend, please check the replication num,"
-                        + "replication tag and storage medium.\n" + "Create failed replications:\n" + failedMsg);
+                        + "replication tag and storage medium and avail capacity of backends.\n"
+                        + "Create failed replications:\n" + failedMsg);
             }
         }
 

fe/fe-core/src/test/java/org/apache/doris/catalog/CreateTableTest.java

@@ -268,11 +268,13 @@ public class CreateTableTest extends TestWithFeService {
 
         ConfigBase.setMutableConfig("disable_storage_medium_check", "false");
         ExceptionChecker
-                .expectThrowsWithMsg(DdlException.class, "Failed to find enough backend, please check the replication num,replication tag and storage medium.\n"
+                .expectThrowsWithMsg(DdlException.class,
+                        "Failed to find enough backend, please check the replication num,replication tag and storage medium and avail capacity of backends.\n"
                                 + "Create failed replications:\n"
                                 + "replication tag: {\"location\" : \"default\"}, replication num: 1, storage medium: SSD",
-                        () -> createTable("create table test.tb7(key1 int, key2 varchar(10)) distributed by hash(key1) \n"
-                                + "buckets 1 properties('replication_num' = '1', 'storage_medium' = 'ssd');"));
+                        () -> createTable(
+                                "create table test.tb7(key1 int, key2 varchar(10)) distributed by hash(key1) \n"
+                                        + "buckets 1 properties('replication_num' = '1', 'storage_medium' = 'ssd');"));
 
         ExceptionChecker
                 .expectThrowsWithMsg(DdlException.class, "sequence column only support UNIQUE_KEYS",

fe/fe-core/src/test/java/org/apache/doris/catalog/ModifyBackendTest.java

@@ -81,7 +81,8 @@ public class ModifyBackendTest {
         String createStr = "create table test.tbl1(\n" + "k1 int\n" + ") distributed by hash(k1)\n"
                 + "buckets 3 properties(\n" + "\"replication_num\" = \"1\"\n" + ");";
         CreateTableStmt createStmt = (CreateTableStmt) UtFrameUtils.parseAndAnalyzeStmt(createStr, connectContext);
-        ExceptionChecker.expectThrowsWithMsg(DdlException.class, "Failed to find enough backend, please check the replication num,replication tag and storage medium.\n"
+        ExceptionChecker.expectThrowsWithMsg(DdlException.class,
+                "Failed to find enough backend, please check the replication num,replication tag and storage medium and avail capacity of backends.\n"
                         + "Create failed replications:\n"
                         + "replication tag: {\"location\" : \"default\"}, replication num: 1, storage medium: SSD",
                 () -> DdlExecutor.execute(Env.getCurrentEnv(), createStmt));
@@ -151,10 +152,10 @@ public class ModifyBackendTest {
         String wrongAlterStr = "alter table test.tbl4 modify partition " + partName
                 + " set ('replication_allocation' = 'tag.location.zonex:1')";
         ExceptionChecker.expectThrowsWithMsg(AnalysisException.class, "errCode = 2, detailMessage = "
-                + "errCode = 2, detailMessage = Failed to find enough backend, "
-                + "please check the replication num,replication tag and storage medium.\n"
-                + "Create failed replications:\n"
-                + "replication tag: {\"location\" : \"zonex\"}, replication num: 1, storage medium: null",
+                        + "errCode = 2, detailMessage = Failed to find enough backend, "
+                        + "please check the replication num,replication tag and storage medium and avail capacity of backends.\n"
+                        + "Create failed replications:\n"
+                        + "replication tag: {\"location\" : \"zonex\"}, replication num: 1, storage medium: null",
                 () -> UtFrameUtils.parseAndAnalyzeStmt(wrongAlterStr, connectContext));
         tblProperties = tableProperty.getProperties();
         Assert.assertTrue(tblProperties.containsKey("default.replication_allocation"));