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Cassandra: Use TokenAwareHostPolicy by default with fallback

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See https://pkg.go.dev/github.com/gocql/gocql#hdr-Data_center_awareness_and_query_routing
This commit is contained in:
nivekuil 2021-07-02 13:02:26 -07:00
parent 17477b37d5
commit 8425705643
2 changed files with 10 additions and 1 deletions
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2
weed/command/scaffold.go
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@ -217,6 +217,8 @@ username=""
password=""
# This changes the data layout. Only add new directories. Removing/Updating will cause data loss.
superLargeDirectories = []
# Name of the datacenter local to this filer, used as host selection fallback.
localDC=""
[hbase]
enabled = false

9
weed/filer/cassandra/cassandra_store.go
View file

@ -32,6 +32,7 @@ func (store *CassandraStore) Initialize(configuration util.Configuration, prefix
configuration.GetString(prefix+"username"),
configuration.GetString(prefix+"password"),
configuration.GetStringSlice(prefix+"superLargeDirectories"),
configuration.GetString(prefix+"localDC"),
)
}
@ -40,13 +41,19 @@ func (store *CassandraStore) isSuperLargeDirectory(dir string) (dirHash string,
return
}
func (store *CassandraStore) initialize(keyspace string, hosts []string, username string, password string, superLargeDirectories []string) (err error) {
func (store *CassandraStore) initialize(keyspace string, hosts []string, username string, password string, superLargeDirectories []string, localDC string) (err error) {
store.cluster = gocql.NewCluster(hosts...)
if username != "" && password != "" {
store.cluster.Authenticator = gocql.PasswordAuthenticator{Username: username, Password: password}
}
store.cluster.Keyspace = keyspace
fallback := gocql.RoundRobinHostPolicy()
if localDC != "" {
fallback = gocql.DCAwareRoundRobinPolicy(localDC)
}
store.cluster.PoolConfig.HostSelectionPolicy = gocql.TokenAwareHostPolicy(fallback)
store.cluster.Consistency = gocql.LocalQuorum
store.session, err = store.cluster.CreateSession()
if err != nil {
glog.V(0).Infof("Failed to open cassandra store, hosts %v, keyspace %s", hosts, keyspace)