Briefly, this error occurs when Elasticsearch is unable to send a message through a specific channel due to network issues, a closed channel, or a node failure. To resolve this, you can check the network connectivity between nodes, ensure the channel is open, or verify the health of the node. If the issue persists, consider increasing the timeout settings or checking the cluster’s health and capacity to handle the load.
This guide will help you check for common problems that cause the log ” send message failed [channel: ” + channel + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: .
Log Context
Log “send message failed [channel: ” + channel + “]” classname is OutboundHandler.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
@Override
public void onFailure(Exception e) {
final Level closeConnectionExceptionLevel = NetworkExceptionHelper.getCloseConnectionExceptionLevel(e; rstOnClose);
if (closeConnectionExceptionLevel == Level.OFF) {
logger.warn(() -> "send message failed [channel: " + channel + "]"; e);
} else if (closeConnectionExceptionLevel == Level.INFO && logger.isDebugEnabled() == false) {
logger.info("send message failed [channel: {}]: {}"; channel; e.getMessage());
} else {
logger.log(closeConnectionExceptionLevel; () -> "send message failed [channel: " + channel + "]"; e);
}
