Move a specific shard from one node to another

move-replica-shard

#!/bin/bash -e
#
# Copyright 2017 Red Hat, Inc. and/or its affiliates
# and other contributors as indicated by the @author tags.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
set -euo pipefail

allow_primary=true

helpMsg() {
cat <<MSG

 Usage: $0 <index> <shard> <from_node> <to_node>
 Command to manually move a replica shard from one Elasticsearch node to another

   args:
     index                The index to move(e.g. .kibana.02c55f18a892b365bcd1802db9e5c9df39c04674)
     shard                The shard to move
     from_node            The node where the shard is currently assigned
     to_node              The node where the shard is to be moved

   options:
     --help,-h            This message.
MSG
}

index=${1:-}
shard=${2:-}
from_node=${3:-}
to_node=${4:-}

if [ -z "${index}" ] || [ -z "${shard}" ] || [ -z "${from_node}" ] || [ -z "${to_node}" ] ; then
    helpMsg
    exit 1
fi

while (($#))
do
case $1 in
    --help|-h)
      helpMsg
      exit 0
      ;;
  esac
  shift
done

payload="{\"commands\":[{\"move\":{\"index\":\"${index}\",\"shard\":${shard},\"from_node\":\"${from_node}\",\"to_node\":\"${to_node}\"}}]}"

oc exec -c elasticsearch $POD -- es_util --query=_cluster/reroute?pretty -XPOST -d ${payload}