Briefly, this error occurs when Elasticsearch encounters an issue in the transport layer, which is responsible for communication between nodes in a cluster. This could be due to network issues, incompatible versions of Elasticsearch in the cluster, or a node failure. To resolve this, you can check the network connectivity between nodes, ensure all nodes are running compatible versions of Elasticsearch, and monitor the health of your nodes to detect and address any failures promptly.
This guide will help you check for common problems that cause the log ” exception caught on transport layer [{}]; closing connection ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .
Log Context
Log “exception caught on transport layer [{}]; closing connection” classname is TcpTransport.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
} else if (e instanceof StreamCorruptedException) {
logger.warn(() -> new ParameterizedMessage("{}; [{}]; closing connection"; e.getMessage(); channel));
} else if (e instanceof TransportNotReadyException) {
logger.debug(() -> new ParameterizedMessage("{} on [{}]; closing connection"; e.getMessage(); channel));
} else {
logger.warn(() -> new ParameterizedMessage("exception caught on transport layer [{}]; closing connection"; channel); e);
}
} finally {
if (closeChannel) {
CloseableChannel.closeChannel(channel);
}
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