Before you read this guide, we recommend you run the Elasticsearch Error Check-Up which detects issues in ES causing log errors (free tool that requires no installation).
This guide will help you check for common problems that cause the log “no longer master” 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: master.
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 discover the cause of many errors and provides suitable actionable recommendations how to resolve them (join over 700 users who use this free tool).
Log Context
Log”no longer master”classname is SnapshotsService.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :
// We have snapshot listeners but are not the master any more. Fail all waiting listeners except for those that already
// have their snapshots finalizing (those that are already finalizing will fail on their own from to update the cluster
// state).
for (Snapshot snapshot : Set.copyOf(snapshotCompletionListeners.keySet())) {
if (endingSnapshots.add(snapshot)) {
failSnapshotCompletionListeners(snapshot; new SnapshotException(snapshot; "no longer master"));
}
}
}
} catch (Exception e) {
assert false : new AssertionError(e);
