https://github.com/voldemort/voldemort
Tip revision: 987b0e82fbb8a327c4cb094f191d81ddea0f79b9 authored by Siddharth Singh on 03 February 2014, 23:19:26 UTC
Updating release_notes for release 1.6.4
Updating release_notes for release 1.6.4
Tip revision: 987b0e8
rebalance-new-zoned-cluster.sh
#!/bin/bash -e
#
# Copyright 2013 LinkedIn, Inc
#
# 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.
# This script generates a final-cluster.xml for spinning up a new cluster.
# Argument = -c current_cluster -s current_stores -o output dir
# The final cluster is placed in output_dir/
# This script uses getopts which means only single character switches are allowed.
# Using getopt would allow for multi charcter switch names but would come at a
# cost of not being cross compatible.
# Function to display usage
usage_and_exit() {
echo "ERROR: $1."
cat <<EOF
Usage: $0 options
OPTIONS:
-h Show this message
-c Current cluster that describes the cluster.
-s Current stores that describes the store. If you do not have info about the stores yet, look
under 'voldemort_home/config/tools/' for some store examples.
-o Output dir where all interim and final files will be stored.
The directory will be created if it does not exist yet.
EOF
exit 1
}
# initialize variables to an empty string
current_cluster=""
current_stores=""
output_dir=""
# Figure out voldemort home directory
dir="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
vold_home="$(dirname "$dir")"
# Parse options
while getopts “hc:s:o:” OPTION
do
case $OPTION in
h)
usage_and_exit
exit 1
;;
c)
current_cluster=$OPTARG
echo "[rebalance-new-zoned-cluster] Will rebalance on the cluster described in '$current_cluster'."
;;
s)
current_stores=$OPTARG
echo "[rebalance-new-zoned-cluster] Will rebalance on the stores described in '$current_stores'."
;;
o)
output_dir=$OPTARG
mkdir -p $output_dir
echo "[rebalance-new-zoned-cluster] Using '$output_dir' for all interim and final files generated."
;;
?)
usage_and_exit
;;
esac
done
if [[ -z $current_cluster ]] || [[ -z $current_stores ]] || [[ -z $output_dir ]]
then
printf "\n"
echo "[rebalance-new-zoned-cluster] Missing argument. Check again."
usage_and_exit
exit 1
fi
if [ ! -e $current_cluster ]; then
usage_and_exit "File '$current_cluster' does not exist."
fi
if [ ! -e $current_stores ]; then
usage_and_exit "File '$current_stores' does not exist."
fi
# The final cluster.xml for new cluster is generated in three steps.
# Step 1 : Repartitioner is executed to limit the max contiguous partition. Four such
# runs are attempted and the best cluster.xml from this step is piped to step 2.
# Step 2: Cluster.xml from step 1 is fed to the repartitioner along with random swap
# attempts. The repartitioner randomly swaps the partitions and tries to balance the ring.
# Step 3: Similar to step1, to improve the balance.
#
step2_swap_attempts=1000
step2_swap_successes=1000
# Step 1
mkdir -p $output_dir/step1/
$vold_home/bin/run-class.sh voldemort.tools.RepartitionerCLI \
--current-cluster $current_cluster \
--current-stores $current_stores \
--max-contiguous-partitions 3 \
--attempts 4 \
--output-dir $output_dir/step1/
if [ ! -e $output_dir/step1/final-cluster.xml ]; then
usage_and_exit "File '$final-cluster.xml' does not exist."
fi
# Step 2
mkdir -p $output_dir/step2
$vold_home/bin/run-class.sh voldemort.tools.RepartitionerCLI \
--current-cluster $output_dir/step1/final-cluster.xml \
--current-stores $current_stores \
--output-dir $output_dir/step2/ \
--enable-random-swaps \
--random-swap-attempts $step2_swap_attempts \
--random-swap-successes $step2_swap_successes
if [ ! -e $output_dir/step2/final-cluster.xml ]; then
usage_and_exit "File '$final-cluster.xml' does not exist."
fi
mkdir -p $output_dir/step3/
# Step 3
$vold_home/bin/run-class.sh voldemort.tools.RepartitionerCLI \
--current-cluster $output_dir/step2/final-cluster.xml \
--current-stores $current_stores \
--max-contiguous-partitions 3 \
--attempts 4 \
--output-dir $output_dir/step3/ \
echo "[rebalance-new-zoned-cluster] Placing final-cluster.xml in '$output_dir'"
cp $output_dir/step3/final-cluster.xml $output_dir/final-cluster.xml
echo "[rebalance-new-zoned-cluster] Placing final-cluster.xml.analysis in '$output_dir'"
cp $output_dir/step2/final-cluster.xml.analysis $output_dir/final-cluster.xml.analysis