[fix](stream load) do not throw exception but skip record when can no…

…t find database (#39360) (#39527)

pick (#39360)

When fetch stream load record from BE node, if can not find database,
StreamLoadRecordMgr will throw exception and the remaining records will
not be recorded in memory.

For example: Ten stream load records were pulled, and the database
associated with the stream load of the first record was deleted by the
user. Therefore, the pull will end, resulting in the remaining nine
records not being consumed recorded in memory.

This pr do not throw exception but skip record when can not find
database to solve this problem.

fe/fe-core/src/main/java/org/apache/doris/load/StreamLoadRecordMgr.java

@@ -22,7 +22,6 @@
 import org.apache.doris.catalog.Env;
 import org.apache.doris.common.ClientPool;
 import org.apache.doris.common.Config;
-import org.apache.doris.common.UserException;
 import org.apache.doris.common.io.Text;
 import org.apache.doris.common.io.Writable;
 import org.apache.doris.common.util.MasterDaemon;
@@ -315,7 +314,8 @@ protected void runAfterCatalogReady() {
                         if (Strings.isNullOrEmpty(streamLoadItem.getCluster())) {
                             dbName = streamLoadItem.getDb();
                         }
-                        throw new UserException("unknown database, database=" + dbName);
+                        LOG.warn("unknown database, database=" + dbName);
+                        continue;
                     }
                     long dbId = db.getId();
                     Env.getCurrentEnv().getStreamLoadRecordMgr()