Thrift 0.9.1 Memory OOM问题解决方法 内存溢出问题

公司工作遇到的一个问题，thrift版本是0.9.1

FrameBuffer为AbstractNonblockingServer类的内部类，TThreadedSelectorServer继承了AbstractNonblockingServer：

通过研究代码，发现FrameBuffer的read方法的代码中有如下片段，

<code class="hljs kotlin">          <span class="hljs-comment">// pull out the frame size as an integer.
          int frameSize = buffer_.getInt(<span class="hljs-number">0);
          <span class="hljs-keyword">if (frameSize <= <span class="hljs-number">0) {
            LOGGER.error(<span class="hljs-string">"Read an invalid frame size of " + frameSize
                + <span class="hljs-string">". Are you using TFramedTransport on the client side?");
            <span class="hljs-keyword">return <span class="hljs-literal">false;
          }
          <span class="hljs-comment">// if this frame will always be too large for this server, log the
          <span class="hljs-comment">// error and close the connection.
          <span class="hljs-keyword">if (frameSize > MAX_READ_BUFFER_BYTES) {
            LOGGER.error(<span class="hljs-string">"Read a frame size of " + frameSize
                + <span class="hljs-string">", which is bigger than the maximum allowable buffer size for ALL connections.");
            <span class="hljs-keyword">return <span class="hljs-literal">false;
          }</span></span></span></span></span></span></span></span></span></span></span></span></span></span></span></code>

MAX_READ_BUFFER_BYTES这个值即为对读取的包的长度限制，为AbstractNonblockingServer类的属性，其值又取自内部类AbstractNonblockingServerArgs的maxReadBufferBytes属性，默认值为long型的最大值；

即只要修改maxReadBufferBytes的值就可以起到限制的作用，修改服务启动的代码如下：

<code class="hljs actionscript">TThreadedSelectorServer.Args args = <span class="hljs-keyword">new TThreadedSelectorServer.Args(transport).processor(
                    processor).workerThreads(<span class="hljs-keyword">this.serverWorkerThreads);

            <span class="hljs-comment">// The maximum amount of memory we will allocate to client IO buffers at a time.
            <span class="hljs-comment">// set 1MB.
            args.maxReadBufferBytes = <span class="hljs-number">1024 * <span class="hljs-number">1024L;

            server = <span class="hljs-keyword">new TThreadedSelectorServer(args);
            server.setServerEventHandler(<span class="hljs-keyword">new DataIfaceServerEvent());
            LOG.info(<span class="hljs-string">"DataIfaceServer start, port={}.", <span class="hljs-keyword">this.serverPort);
            server.serve();</span></span></span></span></span></span></span></span></span></span></code>

args.maxReadBufferBytes = 1024 * 1024L;  --设置为1M

通过对我的thrift的服务进行抓包调研，我的方法调用请求数据包没有超过200字节的，所以1M的长度限制是足够了。

通过测试如上的修改没有问题，并且对服务继续发送http get请求不会导致直接内存增加。并且报出错误日志：

Read a frame size of XXX, which is bigger than the maximum allowable buffer size for ALL connections.

至此问题解决；