Can’t open connection to a null node – Elasticsearch Error How To Solve Related Issues


Can’t open connection to a null node – Elasticsearch Error How To Solve Related Issues

Opster Team

July-20, Version: 1.7-8.0

 

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” can’t open connection to a null node ” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: node.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to pinpoint the cause of many errors and provides suitable actionable recommendations how to resolve them (free tool that requires no installation).

Log Context

Log”can’t open connection to a null node”classname  is TcpTransport.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

@Override
  public void openConnection(DiscoveryNode node; ConnectionProfile profile; ActionListener listener) {
 
  Objects.requireNonNull(profile; "connection profile cannot be null");
  if (node == null) {
  throw new ConnectTransportException(null; "can't open connection to a null node");
  }
  ConnectionProfile finalProfile = maybeOverrideConnectionProfile(profile);
  closeLock.readLock().lock(); // ensure we don't open connections while we are closing
  try {
  ensureOpen();

 

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