Github user tillrohrmann commented on a diff in the pull request: https://github.com/apache/flink/pull/1030#discussion_r37563984 --- Diff: flink-staging/flink-streaming/flink-streaming-core/src/main/java/org/apache/flink/streaming/api/functions/sink/SocketClientSink.java --- @@ -73,13 +84,44 @@ public void intializeConnection() { * The incoming data */ @Override - public void invoke(IN value) { + public void invoke(IN value) throws Exception { byte[] msg = schema.serialize(value); try { dataOutputStream.write(msg); } catch (IOException e) { - throw new RuntimeException("Cannot send message " + value.toString() + - " to socket server at " + hostName + ":" + port, e); + retries = 0; + boolean success = false; + while ((retries < maxRetry || retryForever) && !success && isRunning){ + try { + + if (dataOutputStream != null) { + dataOutputStream.close(); + } + + if (client != null && !client.isClosed()) { + client.close(); + } + + if (!retryForever){ + retries++; + } + + client = new Socket(hostName, port); + dataOutputStream = new DataOutputStream(client.getOutputStream()); + dataOutputStream.write(msg); + success = true; + + }catch(Exception ee){ + + Thread.sleep(CONNECTION_RETRY_SLEEP); --- End diff -- Maybe it's also better to use a `synchronized(lock) { lock.wait(CONNECTION_RETRY_SLEEP) }` here. That way we can call in the `closeConnection` method the `lock.notifyAll` method to directly wake all sleeping threads up. This will speed up the shutdown procedure.
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