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Briefly, this error occurs when you attempt to create a snapshot of an OpenSearch index while a shard relocation process is ongoing. Shard relocation can happen due to various reasons like node failure, rebalancing, etc. To resolve this issue, you can either wait for the relocation process to complete before initiating the snapshot or temporarily disable shard relocation using the cluster settings API. Additionally, ensure that your cluster is in a stable state with no ongoing shard movements before starting the snapshot process.
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This guide will help you check for common problems that cause the log ” cannot snapshot while relocating ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: snapshot.
Log Context
Log “cannot snapshot while relocating” class name is SnapshotShardsService.java. We extracted the following from OpenSearch source code for those seeking an in-depth context :
if (indexShard.routingEntry().primary() == false) {
throw new IndexShardSnapshotFailedException(shardId; "snapshot should be performed only on primary");
}
if (indexShard.routingEntry().relocating()) {
// do not snapshot when in the process of relocation of primaries so we won't get conflicts
throw new IndexShardSnapshotFailedException(shardId; "cannot snapshot while relocating");
} final IndexShardState indexShardState = indexShard.state();
if (indexShardState == IndexShardState.CREATED || indexShardState == IndexShardState.RECOVERING) {
// shard has just been created; or still recovering
