Apache IoTDB Rust Client

Rust client SDK for Apache IoTDB, speaking Apache Thrift RPC (default port 6667). Supports both IoTDB data models, mirroring the architecture of the Node.js and C# SDKs:

Tree model — Session / SessionPool: device/timeseries paths (root.sg.d1.s1)
Table model — TableSession / TableSessionPool: relational SQL dialect

Status

Working client: session management (with multi-node failover), tablet writes (insertTablet) for both models, TsBlock query decoding with paging iteration, and thread-safe session pools. Not yet published to crates.io.

Requirements

Rust 1.75+
Apache IoTDB 2.x — see COMPATIBILITY.md for the full server version matrix, the IDL/Thrift toolchain per release, and the SemVer/deprecation policy (CI tests against 2.0.6 and 2.0.10)

Installation

Once published to crates.io:

[dependencies]
iotdb-client-rust = "0.1"

Until then, use a git dependency:

[dependencies]
iotdb-client = { git = "https://github.com/apache/iotdb-client-rust" }

Quick start

Tree model

use iotdb_client::{Result, Session, SessionConfig, TSDataType, Tablet, Value};

fn main() -> Result<()> {
    let config = SessionConfig::default().with_node_urls(&["127.0.0.1:6667"])?;
    let mut session = Session::new(config);
    session.open()?;

    session.execute_non_query("CREATE DATABASE root.demo")?;
    session.execute_non_query(
        "CREATE TIMESERIES root.demo.d1.temperature WITH DATATYPE=DOUBLE, ENCODING=PLAIN",
    )?;

    // Batch write via a column-major tablet (nulls allowed).
    let mut tablet = Tablet::new(
        "root.demo.d1",
        vec!["temperature".into()],
        vec![TSDataType::Double],
    )?;
    tablet.add_row(1_720_000_000_000, vec![Some(Value::Double(21.5))])?;
    tablet.add_row(1_720_000_001_000, vec![None])?; // null cell
    session.insert_tablet(&tablet)?;
    // Multiple tablets in one RPC: insert_tablets(&[t1, t2], false)
    // (tree model only; insert_aligned_tablets for aligned devices).

    // Or write a single row via insertRecord (row-oriented; aligned variants
    // and multi-row insert_records / insert_records_of_one_device also exist).
    session.insert_record(
        "root.demo.d1",
        1_720_000_002_000,
        vec!["temperature".into()],
        &[Value::Double(22.0)],
        false, // is_aligned
    )?;

    // Query with row iteration; the dataset borrows the session until dropped.
    {
        let mut dataset = session.execute_query("SELECT temperature FROM root.demo.d1")?;
        while let Some(row) = dataset.next_row()? {
            println!("ts={:?} values={:?}", row.timestamp, row.values);
        }
    }

    session.execute_non_query("DELETE DATABASE root.demo")?;
    session.close()
}

Table model

use iotdb_client::{ColumnCategory, Result, TSDataType, TableSession, Tablet, Value};

fn main() -> Result<()> {
    let mut session = TableSession::builder()
        .node_urls(&["127.0.0.1:6667"])?
        .username("root")
        .password("root")
        .build()?;

    session.execute_non_query("CREATE DATABASE IF NOT EXISTS demo")?;
    session.execute_non_query("USE demo")?;
    session.execute_non_query(
        "CREATE TABLE IF NOT EXISTS sensors (device_id STRING TAG, temperature DOUBLE FIELD)",
    )?;

    let mut tablet = Tablet::new_table(
        "sensors",
        vec!["device_id".into(), "temperature".into()],
        vec![TSDataType::String, TSDataType::Double],
        vec![ColumnCategory::Tag, ColumnCategory::Field],
    )?;
    tablet.add_row(
        1_720_000_000_000,
        vec![
            Some(Value::String("dev-1".into())),
            Some(Value::Double(21.5)),
        ],
    )?;
    session.insert(&tablet)?;

    {
        let mut dataset = session.execute_query("SELECT time, device_id, temperature FROM sensors")?;
        while let Some(row) = dataset.next_row()? {
            println!("{:?}", row.values);
        }
    }

    session.execute_non_query("DROP DATABASE demo")?;
    session.close()
}

Session pool

use std::sync::Arc;
use iotdb_client::{Result, SessionPool, SessionPoolConfig};

fn main() -> Result<()> {
    let config = SessionPoolConfig {
        max_size: 4,
        ..SessionPoolConfig::default()
    }
    .with_node_urls(&["127.0.0.1:6667"])?;
    let pool = Arc::new(SessionPool::new(config)?);

    let handles: Vec<_> = (0..4)
        .map(|_| {
            let pool = Arc::clone(&pool);
            std::thread::spawn(move || -> Result<()> {
                let mut session = pool.acquire()?; // RAII guard, released on drop
                session.execute_non_query("SHOW DATABASES")?;
                Ok(())
            })
        })
        .collect();
    for handle in handles {
        handle.join().expect("thread panicked")?;
    }

    pool.close();
    Ok(())
}

Full runnable versions live in examples/:

cargo run --example tree_session
cargo run --example table_session
cargo run --example session_pool

TLS & RPC compression

RPC compression (IoTDB's term for the Thrift compact protocol) is a plain config flag:

let config = SessionConfig { enable_rpc_compression: true, ..Default::default() };
// or: TableSession::builder().enable_rpc_compression(true)...

It must match the server setting dn_rpc_thrift_compression_enable (default false). The server speaks exactly one protocol — there is no per-connection negotiation, so a mismatch in either direction fails at the first RPC with a transport error.

TLS is behind the tls cargo feature (platform-native TLS via native-tls):

iotdb-client-rust = { version = "0.1", features = ["tls"] }

let config = SessionConfig {
    use_ssl: true,
    ca_cert_path: Some("ca.pem".into()),  // trust a private CA / self-signed cert
    accept_invalid_certs: false,          // true skips verification (tests only!)
    domain_override: None,                // SNI/validation hostname when connecting by IP
    ..Default::default()
};
// or: TableSession::builder().use_ssl(true).ca_cert_path("ca.pem")...

For mutual TLS (server has thrift_ssl_client_auth=true), add a PEM client certificate and its PKCS#8 key — the analogue of the Node.js sslOptions.cert/sslOptions.key:

let config = SessionConfig {
    use_ssl: true,
    ca_cert_path: Some("ca.pem".into()),
    client_cert_path: Some("client.crt".into()),  // must be set together
    client_key_path: Some("client.key".into()),   // with client_cert_path
    ..Default::default()
};
// or: TableSession::builder().use_ssl(true).client_cert_path("client.crt").client_key_path("client.key")...

The server needs Thrift SSL enabled (enable_thrift_ssl=true + key store; see tests/fixtures/tls/README.md for a throwaway docker setup). Pool configs pass all options through their embedded session config.

Thrift codegen

Generated stubs live in src/protocol/ (client.rs, common.rs); never hand-edit them. The IDL sources in thrift/ are synced from the IoTDB repo's iotdb-protocol/ (thrift-datanode/src/main/thrift/client.thrift, thrift-commons/src/main/thrift/common.thrift).

Regenerate with:

./tools/generate-thrift.sh

The script picks the Thrift compiler in order of preference:

$THRIFT_BIN if set
the IoTDB repo's Maven build output ($IOTDB_REPO, default ../iotdb): iotdb-protocol/*/target/thrift/bin/thrift — run ./mvnw generate-sources -pl iotdb-protocol/thrift-datanode -am there first. This guarantees the exact Thrift version pinned by the IoTDB pom.
thrift on PATH (version must match the IoTDB pom's thrift.version)

When $IOTDB_REPO is present, the IDL files are re-synced from it before generation, and the Apache license headers are re-prepended to the generated files.

Development

cargo build                              # build
cargo test                               # unit tests (live tests self-skip without a server)
cargo test test_name                     # single test
cargo fmt --check                        # format check
cargo clippy --all-targets -- -D warnings  # lint
./tools/check-license.sh                 # license header check

Integration tests need a running IoTDB; the live tests detect it on 127.0.0.1:6667 and skip gracefully when absent:

docker compose up -d   # standalone IoTDB (see docker-compose-1c1d.yml for a 1C1D cluster)
cargo test             # now includes the live-server tests

Benchmark

examples/benchmark.rs is a write-performance benchmark modeled on the Node.js client's benchmark/ suite and on thulab/iot-benchmark. Tablets are pre-generated outside the timed section; N worker threads each own a pooled session and insert insert_tablet batches round-robin over their devices. Timestamps are sequential per device from a fixed base, so runs are deterministic.

Statistics semantics now mirror iot-benchmark: the per-operation timed span includes batch preparation (not just the insert RPC), failed operations are excluded from latency samples (counted as failOperation/failPoint), and the output includes iot-benchmark-style Result Matrix and Latency (ms) Matrix sections (AVG…P999/MAX/SLOWEST_THREAD; percentiles are exact, whereas iot-benchmark uses a t-digest approximation). Numbers produced by earlier versions of this benchmark (RPC-only timing, including the table below) are not directly comparable to the new output.

# tree model, defaults: 100 devices × 10 sensors × 20 batches × 1000 rows = 20M points, 8 clients
cargo run --release --example benchmark -- --mode tree

# table model at a custom scale, dropping the database afterwards
cargo run --release --example benchmark -- --mode table \
    --devices 20 --sensors 10 --batches 100 --batch-size 100 --clients 8 --cleanup

Knobs: --mode tree|table, --devices, --sensors, --batches (per device), --batch-size (rows per tablet), --clients (worker threads = pool size), --host/--port/--user/--password (also via IOTDB_HOST/PORT/USER/PASSWORD), --base-ts, --point-step, --reuse-tablets (pre-generate only N tablets per worker and re-send them with rebased timestamps — bounds memory for very large runs; the per-batch timestamp rewrite happens inside the timed loop, like a real streaming producer), --tablets-per-rpc (tree model: batch N tablets into one insert_tablets RPC), --cleanup. Sensor types follow the Node.js default distribution (30% FLOAT, 20% DOUBLE, 20% INT32, 10% INT64, 10% TEXT, 10% BOOLEAN). The report includes the human-readable summary, the iot-benchmark-style Result/Latency matrices, and a read-back row-count verification.

Measured on an Apple M2 Pro (10 cores), IoTDB 2.0.6 standalone in Docker on the same machine (Docker VM: all 10 CPUs / 8 GB; JVM heap 1 GB), release build, with the old RPC-only timing (see note above — expect somewhat lower throughput/higher latency with the current semantics):

Mode	Devices × Sensors × Batches × Rows	Clients	Points	Throughput	p50 / p99 latency
tree	20 × 10 × 100 × 100	8	2M	~1.98M pts/s	2.46 ms / 8.38 ms
table	20 × 10 × 100 × 100	8	2M	~1.97M pts/s	2.13 ms / 9.97 ms
tree	100 × 10 × 20 × 1000	8	20M	~12.4M pts/s	4.45 ms / 27.03 ms
tree	100 × 100 × 4 × 1000	10	40M	~15–20M pts/s	31 ms / 156 ms
tree	100 × 100 × 25 × 1000, `--tablets-per-rpc 4`	10	250M	~21–22.5M pts/s	105 ms / 907 ms

Throughput scales with points per RPC: wider tablets (100 sensors = 100k points per 1000-row tablet) and multi-tablet insert_tablets batching lift the same hardware from ~12M to ~22M pts/s sustained (250M points, --reuse-tablets). Beyond ~400k points per RPC — or more clients than cores — throughput plateaus and tail latency grows; during peak runs the server JVM bursts to ~3 cores then stalls on memtable flushes while the Rust client sits at ~30% of one core, so the ceiling here is the co-located dockerized server (1 GB heap), not the client. Numbers are client+server on one machine — treat them as an upper bound on client overhead, not a server capacity measurement.

Project layout

Path	Contents
`src/client/`	`Session`, `TableSession`, `SessionPool`, `TableSessionPool`, `SessionDataSet`
`src/connection/`	Low-level Thrift transport (framed transport + binary protocol)
`src/data/`	`Tablet`, `Value`, `TSDataType` (official TSFile codes 0–11), TsBlock decoding, bitmaps
`src/protocol/`	Generated Thrift stubs (do not edit)
`thrift/`	Thrift IDL sources, synced from the IoTDB repo
`examples/`	Runnable examples for both models and the pools
`tools/`	Codegen and license-check scripts

License

Apache License 2.0