[fix](bdbje) set maxMessageSize for bdbje (#50213)

default is cache size / 2. #50093 reduce memory consumed by fe via
reducing cache size of bdbje.

Author: dataroaring

fe/fe-common/src/main/java/org/apache/doris/common/Config.java

@@ -312,6 +312,9 @@ public class Config extends ConfigBase {
     @ConfField(description = {"BDBJE Cache 内存大小， 最小值为 96KB。", "Amount of memory used by by BDBJE as cache. "})
     public static long bdbje_cache_size_bytes = 10 * 1024 * 1024; // 10 MB
 
+    @ConfField(description = {"BDBJE Message 大小限制。", "Max message size of BDBJE. "})
+    public static long bdbje_max_message_size_bytes = Integer.MAX_VALUE; // 2 GB
+
     @ConfField(masterOnly = true, description = {"心跳线程池的线程数",
             "Num of thread to handle heartbeat events"})
     public static int heartbeat_mgr_threads_num = 8;

fe/fe-core/src/main/java/org/apache/doris/journal/bdbje/BDBEnvironment.java

@@ -130,6 +130,8 @@ public void setup(File envHome, String selfNodeName, String selfNodeHostPort,
             replicationConfig.setNodeType(NodeType.SECONDARY);
             replicationConfig.setConsistencyPolicy(new NoConsistencyRequiredPolicy());
         }
+        replicationConfig.setConfigParam(ReplicationConfig.MAX_MESSAGE_SIZE,
+                                         String.valueOf(Config.bdbje_max_message_size_bytes));
 
         // set environment config
         environmentConfig = new EnvironmentConfig();