S00020

错误代码

S00020

报错信息

Failed to read message from the socket with IO error type xxx. RefId: 00020

Failed to read response message from the socket with IO error type xxx. RefId: 00020

Failed to read object flag from the socket with IO error type xxx. RefId: 00020

Failed to parse the incoming object with IO error type xxx. RefId: 00020

Couldn't send login message to the given host/port with IO error type xxx. RefId: 00020

错误原因

当 server 接收到 xdb 的请求时，首先解析消息头部以获取命令类型（如 HTTP，API，STREAM 等），sessionID，属性信息（包括 rootId，优先级，并行度，客户端ID，消息seqNo 等）和消息长度等。

在此过程中，若出现非预期错误，则会触发上述报错，其中不同 XXX 的含义请参考附录。

可能原因包括：

  1. 解析过程中出现网络错误，如网络中断，对端断开连接等；

  2. 消息协议错误，消息头部信息必须遵循固定格式，协议不符会导致该报错；

  3. 解析出的消息类型当前 server 版本不支持。

解决办法

  1. 检查网络连接是否正常；

  2. 核对 API 和 server 版本的兼容性，排查协议不兼容问题；

  3. 确认 API 是否使用了 server 不支持的新协议。

附录

IO error type 详情：
IO error type 详情
1 Socket is disconnected/closed or file is closed.
2 In non-blocking socket mode, there is no data ready for retrieval yet.
3 Out of memory, no disk space, or no buffer for sending data in non-blocking socket mode.
4 String size exceeds 64K or code size exceeds 1 MB during serialization over network.
5 In non-blocking socket mode, a program is in pending connection mode.
6 Invalid message format.
7 Reach the end of a file or a buffer.
8 File is readable but not writable.
9 File is writable but not readable.
10 A file doesn't exist or the socket destination is not reachable.
11 The database file is corrupted.
12 Not the leader node of the RAFT protocol.
13 Unknown IO error.