Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.
To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.
This guide will help you check for common problems that cause the log ” Unexpected exception while failing ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: discovery-azure-classic.
Log Context
Log “Unexpected exception while failing [{}]” classname is ZenDiscovery.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
} catch (Exception e) {
try {
pendingStatesQueue.markAsFailed(newClusterState; e);
} catch (Exception inner) {
inner.addSuppressed(e);
logger.error(() -> new ParameterizedMessage("unexpected exception while failing [{}]"; reason); inner);
}
return false;
}
if (currentState.blocks().hasGlobalBlock(discoverySettings.getNoMasterBlock())) {
Find & fix Elasticsearch problems
