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Add support for Cassandra reconnect interval #934

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Jul 14, 2018
Merged

Add support for Cassandra reconnect interval #934

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d8e6faa
Make cassandra reconnect down hosts.
nyanshak Jul 13, 2018
67352af
Add cassandra `ReconnectInterval` test.
nyanshak Jul 13, 2018
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5 changes: 5 additions & 0 deletions pkg/cassandra/config/config.go
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,7 @@ type Configuration struct {
Keyspace string `validate:"nonzero"`
ConnectionsPerHost int `validate:"min=1" yaml:"connections_per_host"`
Timeout time.Duration `validate:"min=500"`
ReconnectInterval time.Duration `validate:"min=500" yaml:"reconnect_interval"`
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I'm not convinced that the minimum of 500ns is a good value. Could you elaborate on how this was chosen?

(I think we need to revisit the Timeout as well separately)

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I'm not sure that I really understand the validate:"min=500" section. It seems that it wasn't actually enforced in my tests. (As in, I would not pass any value, resulting in 0, which is less than 500 and it would pass validation. Unless that's a special case?)

I copied Timeout value for this.

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Hmmm, it looks like these validations would only be applied if this configuration file was validated with something like https://github.com/go-validator/validator

I'll make a separate ticket to address this

SocketKeepAlive time.Duration `validate:"min=0" yaml:"socket_keep_alive"`
MaxRetryAttempts int `validate:"min=0" yaml:"max_retry_attempt"`
ProtoVersion int `yaml:"proto_version"`
Expand Down Expand Up @@ -74,6 +75,9 @@ func (c *Configuration) ApplyDefaults(source *Configuration) {
if c.Timeout == 0 {
c.Timeout = source.Timeout
}
if c.ReconnectInterval == 0 {
c.ReconnectInterval = source.ReconnectInterval
}
if c.Port == 0 {
c.Port = source.Port
}
Expand Down Expand Up @@ -109,6 +113,7 @@ func (c *Configuration) NewCluster() *gocql.ClusterConfig {
cluster.Keyspace = c.Keyspace
cluster.NumConns = c.ConnectionsPerHost
cluster.Timeout = c.Timeout
cluster.ReconnectInterval = c.ReconnectInterval
cluster.SocketKeepalive = c.SocketKeepAlive
if c.ProtoVersion > 0 {
cluster.ProtoVersion = c.ProtoVersion
Expand Down
43 changes: 25 additions & 18 deletions plugin/storage/cassandra/options.go
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Expand Up @@ -26,24 +26,25 @@ import (

const (
// session settings
suffixEnabled = ".enabled"
suffixConnPerHost = ".connections-per-host"
suffixMaxRetryAttempts = ".max-retry-attempts"
suffixTimeout = ".timeout"
suffixServers = ".servers"
suffixPort = ".port"
suffixKeyspace = ".keyspace"
suffixConsistency = ".consistency"
suffixProtoVer = ".proto-version"
suffixSocketKeepAlive = ".socket-keep-alive"
suffixUsername = ".username"
suffixPassword = ".password"
suffixTLS = ".tls"
suffixCert = ".tls.cert"
suffixKey = ".tls.key"
suffixCA = ".tls.ca"
suffixServerName = ".tls.server-name"
suffixVerifyHost = ".tls.verify-host"
suffixEnabled = ".enabled"
suffixConnPerHost = ".connections-per-host"
suffixMaxRetryAttempts = ".max-retry-attempts"
suffixTimeout = ".timeout"
suffixReconnectInterval = ".reconnect-interval"
suffixServers = ".servers"
suffixPort = ".port"
suffixKeyspace = ".keyspace"
suffixConsistency = ".consistency"
suffixProtoVer = ".proto-version"
suffixSocketKeepAlive = ".socket-keep-alive"
suffixUsername = ".username"
suffixPassword = ".password"
suffixTLS = ".tls"
suffixCert = ".tls.cert"
suffixKey = ".tls.key"
suffixCA = ".tls.ca"
suffixServerName = ".tls.server-name"
suffixVerifyHost = ".tls.verify-host"

// common storage settings
suffixSpanStoreWriteCacheTTL = ".span-store-write-cache-ttl"
Expand Down Expand Up @@ -83,6 +84,7 @@ func NewOptions(primaryNamespace string, otherNamespaces ...string) *Options {
Keyspace: "jaeger_v1_test",
ProtoVersion: 4,
ConnectionsPerHost: 2,
ReconnectInterval: 60 * time.Second,
},
servers: "127.0.0.1",
namespace: primaryNamespace,
Expand Down Expand Up @@ -130,6 +132,10 @@ func addFlags(flagSet *flag.FlagSet, nsConfig *namespaceConfig) {
nsConfig.namespace+suffixTimeout,
nsConfig.Timeout,
"Timeout used for queries")
flagSet.Duration(
nsConfig.namespace+suffixReconnectInterval,
nsConfig.ReconnectInterval,
"Reconnect interval to retry connecting to downed hosts")
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Q: what would be the behavior if this is set to 0?

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Current (master) jaeger behavior is equivalent to setting to 0. If hosts are marked as down, gocql will not try to reconnect without this set.

flagSet.String(
nsConfig.namespace+suffixServers,
nsConfig.servers,
Expand Down Expand Up @@ -204,6 +210,7 @@ func (cfg *namespaceConfig) initFromViper(v *viper.Viper) {
cfg.ConnectionsPerHost = v.GetInt(cfg.namespace + suffixConnPerHost)
cfg.MaxRetryAttempts = v.GetInt(cfg.namespace + suffixMaxRetryAttempts)
cfg.Timeout = v.GetDuration(cfg.namespace + suffixTimeout)
cfg.ReconnectInterval = v.GetDuration(cfg.namespace + suffixReconnectInterval)
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please add a test

cfg.servers = v.GetString(cfg.namespace + suffixServers)
cfg.Port = v.GetInt(cfg.namespace + suffixPort)
cfg.Keyspace = v.GetString(cfg.namespace + suffixKeyspace)
Expand Down