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2a8381d3fa
Today if a write replication request fails, we will send a shard-failed message to the master node to fail that replica. However, if there are many ongoing write replication requests and the master node is busy, we might overwhelm the cluster and the master node with many shard-failed requests. This commit tries to minimize the shard-failed requests in the above scenario by caching the ongoing shard-failed requests. This issue was discussed at https://discuss.elastic.co/t/half-dead-node-lead-to-cluster-hang/113658/25.