Galera with Galera Arbitrator for conflict resolution.

Pada implementasi terdahulu, digunakan tiga basisdata agar tercapai kuorum. Kuorum ditujukan agar tidak tercapai konflik penulisan (split brain). Namun, sebenarnya untuk dua basisdata saja sudah cukup. Pasang saja Galera Arbritator (GARB) pada kepala kluster dan matikan saja salah satu node supaya terjadi kuorum.

 The twins looked at each other jubilantly but with some surprise. Although 70-534 answer analysis they 70-534 answer analysis considered themselves Scarlett’s favored suitors, they had never before gained tokens ADM-201 exam dumps of this favor so easily. Usually she made them beg and plead, while she put them off, CISSP exam topics refusing to give a 70-534 answer analysis Yes or No answer, laughing if they sulked, growing cool if they became angry. And here she had practically promised them 70-534 answer analysis the ADM-201 exam dumps whole of tomorrow—seats by her at 70-534 answer analysis the barbecue, all the waltzes (and they’d see to it that the dances were CISSP exam topics all waltzes!) and the supper intermission. This was worth getting expelled from the university.Filled ADM-201 exam dumps with new enthusiasm by their success, they CISSP exam topics lingered on, talking about the barbecue 70-534 answer analysis and the ball and Ashley Wilkes 300-208 study material CISSP exam topics and Melanie Hamilton, CISSP exam topics interrupting each other, making jokes and laughing at them, hinting broadly for invitations 300-208 study material to supper. ADM-201 exam dumps Some time had passed before they realized that Scarlett was having very little to say. The atmosphere had somehow changed. Just how, the twins did not know, but the fine glow had gone out of the afternoon. Scarlett seemed to ADM-201 exam dumps be paying little attention to 70-534 answer analysis what they 300-208 study material 70-534 answer analysis ADM-201 exam dumps said, although she made the correct answers. Sensing something they 300-208 study material could not understand, baffled and annoyed by it, the twins struggled along for a while, and then rose reluctantly, ADM-201 exam dumps looking at their 300-208 study material watches.The sun was low CISSP exam topics across the new-plowed fields and the tall woods across the river ADM-201 exam dumps were looming ADM-201 exam dumps blackly in silhouette. Chimney swallows were darting swiftly across the yard, and chickens, ducks and turkeys were waddling 70-534 answer analysis and strutting and straggling in from the fields.Stuart bellowed: “Jeems!” And after an interval a 70-534 answer analysis tall black boy of their own age ran breathlessly around CISSP exam topics the house and out toward the ADM-201 exam dumps tethered horses. Jeems was their 300-208 study material body servant and, like CISSP exam topics the dogs, accompanied them everywhere. He had been CISSP exam topics their childhood playmate and had been given to the twins for their own ADM-201 exam dumps on their tenth birthday. At the sight of him, CISSP exam topics CISSP exam topics the Tarleton hounds rose up out of the red dust and stood waiting expectantly for their masters. The 300-208 study material boys bowed, shook hands and 300-208 study material told CISSP exam topics Scarlett they’d be over 300-208 study material at the 300-208 study material Wilkeses’ early in the morning, waiting for her. Then CISSP exam topics they were ADM-201 exam dumps off down the 70-534 answer analysis walk CISSP exam topics at a rush, mounted their horses and, followed by ADM-201 exam dumps ADM-201 exam dumps Jeems, went down the avenue of cedars at a gallop, waving their hats and yelling back to her.When they had rounded the curve of the dusty road that hid them from Tara, Brent drew his horse to a ADM-201 exam dumps stop under a clump of dogwood. Stuart halted, 70-534 answer analysis too, and the darky boy pulled up a few paces behind 300-208 study material them. The horses, feeling slack reins, 300-208 study material stretched down their necks to crop the tender spring grass, and the patient hounds lay down again in the 300-208 study material CISSP exam topics soft red dust and looked up longingly at the chimney swallows circling in the gathering dusk. 300-208 study material Brent’s wide ingenuous face was puzzled and mildly indignant.“Look,” he said. “Don’t it look to you like she 70-534 answer analysis would of asked us to stay for supper?”  Nor did 70-534 answer analysis James and Andrew, who took him into their store in Savannah, regret his lack of education. His clear hand, his 300-208 study material accurate CISSP exam topics figures and his shrewd ADM-201 exam dumps ability in bargaining won their respect, where a knowledge 70-534 answer analysis of literature and a fine appreciation of music, had young 300-208 study material Gerald possessed them, would have moved them to snorts of contempt. America, in the early years of the century, had been kind to the Irish. James and Andrew, who had begun by hauling goods in covered wagons 70-534 answer analysis from Savannah to Georgia’s inland towns, had prospered into a store of their own, and Gerald prospered with them.

GARB adalah sebuah layanan khusus untuk memilih (voting) di Galera. Dia tidak ada ada data di dalamnya.

Pasang GARB

Supaya sama, saya asumsikan kita memasang repositori resmi dari MariaDB.

curl -sS https://downloads.mariadb.com/MariaDB/mariadb_repo_setup | sudo bash
sudo apt-get update

Mari memasang GARB:

sudo apt-get install galera-arbitrator-3

Selesai.

Konfigurasi GARB

Ubah berkas /etc/default/garb sebelum memulai GARB.

# Copyright (C) 2012 Codership Oy
# This config file is to be sourced by garb service script.

# A comma-separated list of node addresses (address[:port]) in the cluster
GALERA_NODES="192.168.101.10:4567,192.168.101.11:4567"

# Galera cluster name, should be the same as on the rest of the nodes.
GALERA_GROUP="apakek_cluster"

# Optional Galera internal options string (e.g. SSL settings)
# see http://galeracluster.com/documentation-webpages/galeraparameters.html
# GALERA_OPTIONS=""

# Log file for garbd. Optional, by default logs to syslog
# LOG_FILE=""

Jangan lupa untuk menyertakan port! Ada galat dikonfigurasi GARB bila kita tidak secara spesifik menyebutkan port Galera.

Jalankan GARB

sudo /etc/init.d/garb start

Bila sudah benar, seharusnya saat menguji jumlah node dalam kluster tetap tiga.

$ sudo mysql --defaults-file=/etc/mysql/debian.cnf -e 'SELECT VARIABLE_VALUE as "cluster size" FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME="wsrep_cluster_size"'
+--------------+
| cluster size |
+--------------+
| 3            |
+--------------+

Selesai.