Unexpected exception while failing – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.17

Briefly, this error occurs when Elasticsearch encounters an unexpected issue while trying to mark a task as failed. This could be due to a variety of reasons such as network issues, node failures, or data corruption. To resolve this issue, you could try restarting the Elasticsearch node, checking the network connectivity, or repairing the corrupted data. If the problem persists, you may need to look into the Elasticsearch logs for more detailed information about the error.

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.

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(noMasterBlockService.getNoMasterBlock())) {

 

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