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Apache IoTDB

Apache IoTDB (Database for Internet of Things) is an IoT native database with high performance for data management and analysis, deployable on the edge and the cloud. Due to its light-weight architecture, high performance and rich feature set together with its deep integration with Apache Hadoop, Spark and Flink, Apache IoTDB can meet the requirements of massive data storage, high-speed data ingestion and complex data analysis in the IoT industrial fields.

Apache IoTDB Client for Go

Overview

This is the GoLang client of Apache IoTDB.

Apache IoTDB website: https://iotdb.apache.org Apache IoTDB GitHub: https://github.com/apache/iotdb

Prerequisites

golang >= 1.13

How to Use the Client (Quick Start)

With go mod

export GO111MODULE=on
export GOPROXY=https://goproxy.io

mkdir session_example && cd session_example

curl -o session_example.go -L https://github.com/apache/iotdb-client-go/raw/main/example/session_example.go

go mod init session_example
go run session_example.go

Without go mod

# get thrift 0.15.0
go get github.com/apache/thrift
cd $GOPATH/src/github.com/apache/thrift
git checkout 0.15.0

mkdir -p $GOPATH/src/iotdb-client-go-example/session_example
cd $GOPATH/src/iotdb-client-go-example/session_example

curl -o session_example.go -L https://github.com/apache/iotdb-client-go/raw/main/example/session_example.go
go run session_example.go

How to Use the SessionPool

SessionPool is a wrapper of a Session Set. Using SessionPool, the user do not need to consider how to reuse a session connection. If there is no available connections and the pool reaches its max size, the all methods will hang until there is a available connection. The PutBack method must be called after use

New sessionPool

standalone

config := &client.PoolConfig{
    Host:     host,
    Port:     port,
    UserName: user,
    Password: password,
}
sessionPool = client.NewSessionPool(config, 3, 60000, 60000, false)

cluster or doubleLive

config := &client.PoolConfig{
  UserName: user,
  Password: password,
  NodeUrls: strings.Split("127.0.0.1:6667,127.0.0.1:6668", ","),
 }
sessionPool = client.NewSessionPool(config, 3, 60000, 60000, false)

Get session through sessionPool, putback after use

set storage group

session, err := sessionPool.GetSession()
defer sessionPool.PutBack(session)
if err == nil {
    session.SetStorageGroup(sg)
}

query statement

var timeout int64 = 1000
session, err := sessionPool.GetSession()
defer sessionPool.PutBack(session)
if err != nil {
    log.Print(err)
    return
}
sessionDataSet, err := session.ExecuteQueryStatement(sql, &timeout)
if err == nil {
    defer sessionDataSet.Close()
    printDataSet1(sessionDataSet)
} else {
    log.Println(err)
}

Developer environment requirements for iotdb-client-go

OS

• Linux, Macos or other unix-like OS
• Windows+bash(WSL, cygwin, Git Bash)

Command Line Tools

• golang >= 1.13
• make >= 3.0
• curl >= 7.1.1
• thrift 0.15.0

Troubleshooting

Thrift version compatibility issues

In the branch rel/0.13 and earlier versions, the version of apache/thrift is v0.14.1. In the latest version, apache/thrift has been upgraded to v0.15.0.

The two versions are not compatible on some interfaces. Using mismatched version will cause compilation errors.

The interfaces changed in the two versions are as follows:

1. NewTSocketConf. This function returns two values in the version v0.14.1 and only one value in the version v0.15.0.
2. NewTFramedTransport has been deprecated, use NewTFramedTransportConf instead.

For more details, please take a look at this PR: update thrift to 0.15.0 to fit IoTDB 0.13.0

Parameter name mismatch with actual usage in function 'Open'

The implementation of the function client/session.go/Open() is mismatched with the description. The parameter connectionTimeoutInMs represents connection timeout in milliseconds. However, in the older version, this function did not implement correctly, regarding it as nanosecond instead. The bug is now fixed. Positive value of this parameter means connection timeout in milliseconds. Set 0 for no timeout.