Github user rmetzger commented on a diff in the pull request: https://github.com/apache/flink/pull/1962#discussion_r62174087 --- Diff: flink-streaming-connectors/flink-connector-elasticsearch2/src/main/java/org/apache/flink/streaming/connectors/elasticsearch2/ElasticsearchSink.java --- @@ -177,7 +180,72 @@ public void open(Configuration configuration) { if (LOG.isInfoEnabled()) { LOG.info("Created Elasticsearch TransportClient {}", client); } + } + + @Override + public void invoke(final T element) { + ParameterTool params = ParameterTool.fromMap(userConfig); + + if (params.has(CONFIG_NO_OF_CONN_RETRIES) && params.getInt(CONFIG_NO_OF_CONN_RETRIES) > 0) { + final Timer timer = new Timer(true); + TimerTask task = new TimerTask() { + @Override + public void run() { + // verify that we actually are connected to a cluster + ImmutableList<DiscoveryNode> nodes = ImmutableList.copyOf(((TransportClient) client).connectedNodes()); + if (nodes.isEmpty()) { + if (LOG.isInfoEnabled()) { + LOG.info("Connection Lost..Trying to reconnect to Elasticsearch nodes..."); + } + open(new Configuration()); --- End diff -- I would not recommend calling the open() method from invoke(). Open() is a "lifecycle" method called by Flink. You should assume its only called one. However, you can move the (re)connect logic into a separate method.
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