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Consistency Levels

ANY A write is written to at least one node in the cluster. Provides the highest availability with the lowest consistency.
QUORUM When a majority of the replicas respond, the request is honored. If RF=3, then 2 replicas respond. QUORUM can be calculated using the formula (n/2 +1) where n is the Replication Factor.
ONE If one replica responds, the request is honored.
LOCAL_ONE At least one replica in the local data center responds.
LOCAL_QUORUM A quorum of replicas in the local datacenter responds.
EACH_QUORUM (unsupported for reads) – A quorum of replicas in ALL data centers must be written to.
ALL A write must be written to all replicas in the cluster, a read waits for a response from all replicas. Provides the lowest availability with the highest consistency.

LXC Params

Developer mode on

SCYLLA_ARGS="--log-to-syslog 1 --log-to-stdout 0 --default-log-level info --collectd-address=127.0.0.1:25826 --collectd=1 --collectd-poll-period 3000 --network-stack posix --smp 4 --memory 6G --overprovisioned"
cat /etc/scylla.d/cpuset.conf
CPUSET="--cpuset 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35"

Delay Start Systemd

[Service] ExecStartPre=/bin/sleep 10

Cannot start ScyllaDB 2.1 on CentOS 7

remark AmbientCapabilities in scylla-server.service

Remove node

Temporary

nodetool drain

Flush node

nodetool decomission

3rd repository

https://copr.fedorainfracloud.org/coprs/scylladb/scylla-3rdparty/repo/epel-7/scylladb-scylla-3rdparty-epel-7.repo
scylladb.txt · Last modified: 2019/01/01 14:50 by Jan Forman