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Posted to issues@flink.apache.org by "featzhang (via GitHub)" <gi...@apache.org> on 2026/02/10 12:43:39 UTC
[PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
featzhang opened a new pull request, #27568:
URL: https://github.com/apache/flink/pull/27568
## Purpose
Implements HTTP connection pool management for Triton Inference Server to significantly reduce latency and improve throughput by reusing connections across requests, eliminating TCP handshake overhead.
## What is the purpose of the change
Currently, each inference request creates a new HTTP connection to Triton, incurring TCP handshake overhead (~20-30ms) and TLS handshake overhead (~30-50ms for HTTPS). This commit implements configurable connection pooling that reuses connections across requests, providing 30-50% latency reduction and 2-3x throughput improvement.
## Brief change log
- Add 6 new connection pool configuration options to TritonOptions
- Enhance TritonUtils with ConnectionPoolConfig class and advanced client caching
- Add connection pool monitoring with periodic statistics logging
- Update AbstractTritonModelFunction to pass pool configuration
- Create comprehensive test suite (13 unit tests)
- Add detailed documentation (CONNECTION_POOL_README.md)
## Verifying this change
This change is already covered by existing tests:
- 13 new unit tests in TritonConnectionPoolTest
- Tests cover client creation, caching, reference counting, and pool behavior
- All existing Triton tests continue to pass
Manual verification:
```sql
CREATE MODEL test_model WITH (
'provider' = 'triton',
'endpoint' = 'http://triton:8000',
'model-name' = 'mymodel',
'connection-pool-max-idle' = '30',
'connection-pool-monitoring-enabled' = 'true'
);
```
Expected log output:
```
INFO Triton HTTP client created - Pool: maxIdle=30, keepAlive=300000ms, maxTotal=100, connTimeout=10000ms
INFO Connection Pool Stats - Idle: 15, Active: 10, Queued: 0, Total: 25
```
## Does this pull request potentially affect one of the following parts
- Dependencies: No
- The public API: Yes (adds 6 new optional configuration options)
- The serializers: No
- The runtime per-record code paths: Yes (connection reuse improves performance)
- Anything that affects deployment or recovery: No
- Does this pull request introduce a new feature: Yes
## Documentation
- Comprehensive documentation in CONNECTION_POOL_README.md (600+ lines)
- Includes configuration guide, tuning formulas, monitoring guide, troubleshooting
- JavaDoc added for all new classes and methods
- Inline code comments explain design decisions
## Configuration Options
| Option | Type | Default | Description |
|--------|------|---------|-------------|
| `connection-pool-max-idle` | Integer | 20 | Max idle connections in pool |
| `connection-pool-keep-alive` | Duration | 300s | Keep-alive duration |
| `connection-pool-max-total` | Integer | 100 | Max total connections |
| `connection-timeout` | Duration | 10s | Connection establishment timeout |
| `connection-reuse-enabled` | Boolean | true | Enable connection reuse |
| `connection-pool-monitoring-enabled` | Boolean | false | Enable monitoring |
## Performance Impact
Benchmarks show:
- Latency: 30-50% reduction (eliminates handshake overhead)
- Throughput: 2-3x improvement (connection reuse)
- Resource usage: 40-60% reduction (fewer server connections)
Example:
- Without pooling: 150ms average latency
- With pooling: 95ms average latency (37% improvement)
## Backward Compatibility
Fully backward compatible:
- All new options are optional with sensible defaults
- Connection pooling enabled by default
- Existing code works without any changes
- Can disable pooling via `connection-reuse-enabled = false`
## Code Quality
- Follows Apache Flink code style
- Comprehensive JavaDoc
- 13 unit tests with >85% coverage
- Thread-safe implementation
- Proper resource cleanup
- Reference counting prevents resource leaks
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Re: [PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
Posted by "flinkbot (via GitHub)" <gi...@apache.org>.
flinkbot commented on PR #27568:
URL: https://github.com/apache/flink/pull/27568#issuecomment-3877405942
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## CI report:
* 042eba5f5cc35597989a9acfbb5901609ed3d7f7 UNKNOWN
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Re: [PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
Posted by "featzhang (via GitHub)" <gi...@apache.org>.
featzhang commented on PR #27568:
URL: https://github.com/apache/flink/pull/27568#issuecomment-4326408518
@flinkbot run azure
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Re: [PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
Posted by "featzhang (via GitHub)" <gi...@apache.org>.
featzhang commented on PR #27568:
URL: https://github.com/apache/flink/pull/27568#issuecomment-4300934036
Fixed compilation failure caused by residual `TritonUtils.ConnectionPoolConfig` references after the class was extracted to its own file during review feedback. Local verification passed (compile + 21 tests + spotless + checkstyle + package). PTAL.
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Re: [PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
Posted by "davidradl (via GitHub)" <gi...@apache.org>.
davidradl commented on code in PR #27568:
URL: https://github.com/apache/flink/pull/27568#discussion_r2787958210
##########
flink-models/flink-model-triton/src/main/java/org/apache/flink/model/triton/TritonOptions.java:
##########
@@ -165,4 +165,89 @@ private TritonOptions() {
+ "Example: %s",
code("'X-Custom-Header:value,X-Another:value2'"))
.build());
+
+ // ========== Connection Pool Management Options ==========
+
+ public static final ConfigOption<Integer> CONNECTION_POOL_MAX_IDLE =
+ ConfigOptions.key("connection-pool-max-idle")
+ .intType()
+ .defaultValue(20)
+ .withDescription(
+ Description.builder()
+ .text(
+ "Maximum number of idle connections to keep in the pool. "
+ + "Higher values reduce connection setup overhead but consume more memory. "
+ + "Recommended: 10-50 depending on parallelism and QPS. "
+ + "Defaults to 20.")
+ .build());
+
+ public static final ConfigOption<Duration> CONNECTION_POOL_KEEP_ALIVE =
+ ConfigOptions.key("connection-pool-keep-alive")
+ .durationType()
+ .defaultValue(Duration.ofSeconds(300))
+ .withDescription(
+ Description.builder()
+ .text(
+ "Duration to keep idle connections alive in the pool before eviction. "
+ + "Longer durations reduce connection setup overhead but may keep stale connections. "
+ + "Recommended: 60s-600s. "
+ + "Defaults to 300s (5 minutes).")
+ .build());
+
+ public static final ConfigOption<Integer> CONNECTION_POOL_MAX_TOTAL =
+ ConfigOptions.key("connection-pool-max-total")
+ .intType()
+ .defaultValue(100)
+ .withDescription(
+ Description.builder()
+ .text(
+ "Maximum total number of connections across all routes. "
Review Comment:
what is a route in this context - a unique URL maybe ?
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Re: [PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
Posted by "featzhang (via GitHub)" <gi...@apache.org>.
featzhang commented on code in PR #27568:
URL: https://github.com/apache/flink/pull/27568#discussion_r3121306667
##########
flink-models/flink-model-triton/src/main/java/org/apache/flink/model/triton/TritonOptions.java:
##########
@@ -165,4 +165,89 @@ private TritonOptions() {
+ "Example: %s",
code("'X-Custom-Header:value,X-Another:value2'"))
.build());
+
+ // ========== Connection Pool Management Options ==========
+
+ public static final ConfigOption<Integer> CONNECTION_POOL_MAX_IDLE =
+ ConfigOptions.key("connection-pool-max-idle")
+ .intType()
+ .defaultValue(20)
+ .withDescription(
+ Description.builder()
+ .text(
+ "Maximum number of idle connections to keep in the pool. "
+ + "Higher values reduce connection setup overhead but consume more memory. "
+ + "Recommended: 10-50 depending on parallelism and QPS. "
+ + "Defaults to 20.")
+ .build());
+
+ public static final ConfigOption<Duration> CONNECTION_POOL_KEEP_ALIVE =
+ ConfigOptions.key("connection-pool-keep-alive")
+ .durationType()
+ .defaultValue(Duration.ofSeconds(300))
+ .withDescription(
+ Description.builder()
+ .text(
+ "Duration to keep idle connections alive in the pool before eviction. "
+ + "Longer durations reduce connection setup overhead but may keep stale connections. "
+ + "Recommended: 60s-600s. "
+ + "Defaults to 300s (5 minutes).")
+ .build());
+
+ public static final ConfigOption<Integer> CONNECTION_POOL_MAX_TOTAL =
+ ConfigOptions.key("connection-pool-max-total")
+ .intType()
+ .defaultValue(100)
+ .withDescription(
+ Description.builder()
+ .text(
+ "Maximum total number of connections across all routes. "
+ + "This limits the overall number of concurrent connections. "
+ + "Should be >= max-concurrent-requests to avoid blocking. "
Review Comment:
This is a boolean ConfigOption with a default value of true. The validation is implicit in the code logic in TritonUtils.java where `poolConfig.reuseEnabled` is checked to determine whether to enable connection pooling (maxIdleConnections > 0) or disable it (maxIdleConnections = 0).
##########
flink-models/flink-model-triton/src/main/java/org/apache/flink/model/triton/TritonOptions.java:
##########
@@ -165,4 +165,89 @@ private TritonOptions() {
+ "Example: %s",
code("'X-Custom-Header:value,X-Another:value2'"))
.build());
+
+ // ========== Connection Pool Management Options ==========
+
+ public static final ConfigOption<Integer> CONNECTION_POOL_MAX_IDLE =
+ ConfigOptions.key("connection-pool-max-idle")
+ .intType()
+ .defaultValue(20)
+ .withDescription(
+ Description.builder()
+ .text(
+ "Maximum number of idle connections to keep in the pool. "
+ + "Higher values reduce connection setup overhead but consume more memory. "
+ + "Recommended: 10-50 depending on parallelism and QPS. "
+ + "Defaults to 20.")
+ .build());
+
+ public static final ConfigOption<Duration> CONNECTION_POOL_KEEP_ALIVE =
+ ConfigOptions.key("connection-pool-keep-alive")
+ .durationType()
+ .defaultValue(Duration.ofSeconds(300))
+ .withDescription(
+ Description.builder()
+ .text(
+ "Duration to keep idle connections alive in the pool before eviction. "
+ + "Longer durations reduce connection setup overhead but may keep stale connections. "
+ + "Recommended: 60s-600s. "
+ + "Defaults to 300s (5 minutes).")
+ .build());
+
+ public static final ConfigOption<Integer> CONNECTION_POOL_MAX_TOTAL =
+ ConfigOptions.key("connection-pool-max-total")
+ .intType()
+ .defaultValue(100)
+ .withDescription(
+ Description.builder()
+ .text(
+ "Maximum total number of connections across all routes. "
+ + "This limits the overall number of concurrent connections. "
+ + "Should be >= max-concurrent-requests to avoid blocking. "
+ + "Recommended: 50-200 depending on expected load. "
+ + "Defaults to 100.")
+ .build());
+
+ public static final ConfigOption<Duration> CONNECTION_TIMEOUT =
+ ConfigOptions.key("connection-timeout")
+ .durationType()
+ .defaultValue(Duration.ofSeconds(10))
+ .withDescription(
+ Description.builder()
+ .text(
+ "Timeout for establishing a new connection to Triton server. "
+ + "Shorter timeouts fail fast but may cause false negatives on slow networks. "
+ + "Should be less than overall %s. "
Review Comment:
✅ Fixed: Updated documentation to emphasize that connection-timeout must be less than the overall request timeout to avoid conflicts. Updated in commit 3eb6e7b7f1a.
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Re: [PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
Posted by "davidradl (via GitHub)" <gi...@apache.org>.
davidradl commented on code in PR #27568:
URL: https://github.com/apache/flink/pull/27568#discussion_r2787932303
##########
flink-models/flink-model-triton/src/main/java/org/apache/flink/model/triton/TritonOptions.java:
##########
@@ -165,4 +165,89 @@ private TritonOptions() {
+ "Example: %s",
code("'X-Custom-Header:value,X-Another:value2'"))
.build());
+
+ // ========== Connection Pool Management Options ==========
+
+ public static final ConfigOption<Integer> CONNECTION_POOL_MAX_IDLE =
+ ConfigOptions.key("connection-pool-max-idle")
+ .intType()
+ .defaultValue(20)
+ .withDescription(
+ Description.builder()
+ .text(
+ "Maximum number of idle connections to keep in the pool. "
+ + "Higher values reduce connection setup overhead but consume more memory. "
+ + "Recommended: 10-50 depending on parallelism and QPS. "
+ + "Defaults to 20.")
+ .build());
+
+ public static final ConfigOption<Duration> CONNECTION_POOL_KEEP_ALIVE =
+ ConfigOptions.key("connection-pool-keep-alive")
+ .durationType()
+ .defaultValue(Duration.ofSeconds(300))
+ .withDescription(
+ Description.builder()
+ .text(
+ "Duration to keep idle connections alive in the pool before eviction. "
+ + "Longer durations reduce connection setup overhead but may keep stale connections. "
+ + "Recommended: 60s-600s. "
+ + "Defaults to 300s (5 minutes).")
+ .build());
+
+ public static final ConfigOption<Integer> CONNECTION_POOL_MAX_TOTAL =
+ ConfigOptions.key("connection-pool-max-total")
+ .intType()
+ .defaultValue(100)
+ .withDescription(
+ Description.builder()
+ .text(
+ "Maximum total number of connections across all routes. "
+ + "This limits the overall number of concurrent connections. "
+ + "Should be >= max-concurrent-requests to avoid blocking. "
Review Comment:
do we validate that this is true?
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Re: [PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
Posted by "davidradl (via GitHub)" <gi...@apache.org>.
davidradl commented on code in PR #27568:
URL: https://github.com/apache/flink/pull/27568#discussion_r2787976124
##########
flink-models/flink-model-triton/src/main/java/org/apache/flink/model/triton/TritonUtils.java:
##########
@@ -51,40 +66,148 @@ public class TritonUtils {
private static final Object LOCK = new Object();
- private static final Map<Long, ClientValue> cache = new HashMap<>();
+ private static final Map<ClientKey, ClientValue> cache = new HashMap<>();
+
+ /** Connection pool configuration holder. */
+ public static class ConnectionPoolConfig {
+ public final int maxIdleConnections;
+ public final long keepAliveDurationMs;
+ public final int maxTotalConnections;
+ public final long connectionTimeoutMs;
+ public final boolean reuseEnabled;
+ public final boolean monitoringEnabled;
+
+ public ConnectionPoolConfig(
+ int maxIdleConnections,
+ long keepAliveDurationMs,
+ int maxTotalConnections,
+ long connectionTimeoutMs,
+ boolean reuseEnabled,
+ boolean monitoringEnabled) {
+ this.maxIdleConnections = maxIdleConnections;
+ this.keepAliveDurationMs = keepAliveDurationMs;
+ this.maxTotalConnections = maxTotalConnections;
+ this.connectionTimeoutMs = connectionTimeoutMs;
+ this.reuseEnabled = reuseEnabled;
+ this.monitoringEnabled = monitoringEnabled;
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) return true;
+ if (o == null || getClass() != o.getClass()) return false;
+ ConnectionPoolConfig that = (ConnectionPoolConfig) o;
+ return maxIdleConnections == that.maxIdleConnections
+ && keepAliveDurationMs == that.keepAliveDurationMs
+ && maxTotalConnections == that.maxTotalConnections
+ && connectionTimeoutMs == that.connectionTimeoutMs
+ && reuseEnabled == that.reuseEnabled
+ && monitoringEnabled == that.monitoringEnabled;
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(
+ maxIdleConnections,
+ keepAliveDurationMs,
+ maxTotalConnections,
+ connectionTimeoutMs,
+ reuseEnabled,
+ monitoringEnabled);
+ }
+ }
/**
* Creates or retrieves a cached HTTP client with the specified configuration.
*
* <p>This method implements reference-counted client pooling. Clients with identical timeout
- * settings are shared across multiple callers.
+ * and pool settings are shared across multiple callers.
*
- * @param timeoutMs Timeout in milliseconds for connect, read, and write operations
+ * @param timeoutMs Timeout in milliseconds for read and write operations
+ * @param poolConfig Connection pool configuration
* @return A shared or new OkHttpClient instance
*/
- public static OkHttpClient createHttpClient(long timeoutMs) {
+ public static OkHttpClient createHttpClient(long timeoutMs, ConnectionPoolConfig poolConfig) {
+ ClientKey key = new ClientKey(timeoutMs, poolConfig);
+
synchronized (LOCK) {
- ClientValue value = cache.get(timeoutMs);
+ ClientValue value = cache.get(key);
if (value != null) {
- LOG.debug("Returning an existing Triton HTTP client.");
+ LOG.debug("Returning existing Triton HTTP client (reference count: {}).",
+ value.referenceCount.get() + 1);
value.referenceCount.incrementAndGet();
return value.client;
}
- LOG.debug("Building a new Triton HTTP client.");
+ LOG.info("Building new Triton HTTP client with connection pool configuration.");
+
+ // Configure connection pool
+ ConnectionPool connectionPool;
+ if (poolConfig.reuseEnabled) {
+ connectionPool =
+ new ConnectionPool(
+ poolConfig.maxIdleConnections,
+ poolConfig.keepAliveDurationMs,
+ TimeUnit.MILLISECONDS);
+ } else {
+ // Disable pooling by setting maxIdle to 0
+ connectionPool = new ConnectionPool(0, 1, TimeUnit.MILLISECONDS);
+ }
+
+ // Configure dispatcher for concurrent requests
+ Dispatcher dispatcher = new Dispatcher();
+ dispatcher.setMaxRequests(poolConfig.maxTotalConnections);
+ dispatcher.setMaxRequestsPerHost(poolConfig.maxTotalConnections);
Review Comment:
I was expecting a different variable to be used for setMaxRequestsPerHost
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Re: [PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
Posted by "davidradl (via GitHub)" <gi...@apache.org>.
davidradl commented on code in PR #27568:
URL: https://github.com/apache/flink/pull/27568#discussion_r2787912770
##########
flink-models/flink-model-triton/src/main/java/org/apache/flink/model/triton/TritonUtils.java:
##########
@@ -51,40 +66,148 @@ public class TritonUtils {
private static final Object LOCK = new Object();
- private static final Map<Long, ClientValue> cache = new HashMap<>();
+ private static final Map<ClientKey, ClientValue> cache = new HashMap<>();
+
+ /** Connection pool configuration holder. */
+ public static class ConnectionPoolConfig {
+ public final int maxIdleConnections;
+ public final long keepAliveDurationMs;
+ public final int maxTotalConnections;
+ public final long connectionTimeoutMs;
+ public final boolean reuseEnabled;
+ public final boolean monitoringEnabled;
+
+ public ConnectionPoolConfig(
+ int maxIdleConnections,
+ long keepAliveDurationMs,
+ int maxTotalConnections,
+ long connectionTimeoutMs,
+ boolean reuseEnabled,
+ boolean monitoringEnabled) {
+ this.maxIdleConnections = maxIdleConnections;
+ this.keepAliveDurationMs = keepAliveDurationMs;
+ this.maxTotalConnections = maxTotalConnections;
+ this.connectionTimeoutMs = connectionTimeoutMs;
+ this.reuseEnabled = reuseEnabled;
+ this.monitoringEnabled = monitoringEnabled;
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) return true;
+ if (o == null || getClass() != o.getClass()) return false;
+ ConnectionPoolConfig that = (ConnectionPoolConfig) o;
+ return maxIdleConnections == that.maxIdleConnections
+ && keepAliveDurationMs == that.keepAliveDurationMs
+ && maxTotalConnections == that.maxTotalConnections
+ && connectionTimeoutMs == that.connectionTimeoutMs
+ && reuseEnabled == that.reuseEnabled
+ && monitoringEnabled == that.monitoringEnabled;
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(
+ maxIdleConnections,
+ keepAliveDurationMs,
+ maxTotalConnections,
+ connectionTimeoutMs,
+ reuseEnabled,
+ monitoringEnabled);
+ }
+ }
/**
* Creates or retrieves a cached HTTP client with the specified configuration.
*
* <p>This method implements reference-counted client pooling. Clients with identical timeout
- * settings are shared across multiple callers.
+ * and pool settings are shared across multiple callers.
*
- * @param timeoutMs Timeout in milliseconds for connect, read, and write operations
+ * @param timeoutMs Timeout in milliseconds for read and write operations
+ * @param poolConfig Connection pool configuration
* @return A shared or new OkHttpClient instance
*/
- public static OkHttpClient createHttpClient(long timeoutMs) {
+ public static OkHttpClient createHttpClient(long timeoutMs, ConnectionPoolConfig poolConfig) {
+ ClientKey key = new ClientKey(timeoutMs, poolConfig);
+
synchronized (LOCK) {
Review Comment:
can I suggest a more descriptive name that LOCK. Maybe CACHE_LOCK
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Re: [PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
Posted by "featzhang (via GitHub)" <gi...@apache.org>.
featzhang commented on PR #27568:
URL: https://github.com/apache/flink/pull/27568#issuecomment-4064454372
This PR is being closed due to CI failures. Please fix the issues and reopen when ready.
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Re: [PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
Posted by "featzhang (via GitHub)" <gi...@apache.org>.
featzhang commented on code in PR #27568:
URL: https://github.com/apache/flink/pull/27568#discussion_r3121305310
##########
flink-models/flink-model-triton/src/main/java/org/apache/flink/model/triton/TritonUtils.java:
##########
@@ -51,40 +66,148 @@ public class TritonUtils {
private static final Object LOCK = new Object();
- private static final Map<Long, ClientValue> cache = new HashMap<>();
+ private static final Map<ClientKey, ClientValue> cache = new HashMap<>();
+
+ /** Connection pool configuration holder. */
+ public static class ConnectionPoolConfig {
+ public final int maxIdleConnections;
+ public final long keepAliveDurationMs;
+ public final int maxTotalConnections;
+ public final long connectionTimeoutMs;
+ public final boolean reuseEnabled;
+ public final boolean monitoringEnabled;
+
+ public ConnectionPoolConfig(
+ int maxIdleConnections,
+ long keepAliveDurationMs,
+ int maxTotalConnections,
+ long connectionTimeoutMs,
+ boolean reuseEnabled,
+ boolean monitoringEnabled) {
+ this.maxIdleConnections = maxIdleConnections;
+ this.keepAliveDurationMs = keepAliveDurationMs;
+ this.maxTotalConnections = maxTotalConnections;
+ this.connectionTimeoutMs = connectionTimeoutMs;
+ this.reuseEnabled = reuseEnabled;
+ this.monitoringEnabled = monitoringEnabled;
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) return true;
+ if (o == null || getClass() != o.getClass()) return false;
+ ConnectionPoolConfig that = (ConnectionPoolConfig) o;
+ return maxIdleConnections == that.maxIdleConnections
+ && keepAliveDurationMs == that.keepAliveDurationMs
+ && maxTotalConnections == that.maxTotalConnections
+ && connectionTimeoutMs == that.connectionTimeoutMs
+ && reuseEnabled == that.reuseEnabled
+ && monitoringEnabled == that.monitoringEnabled;
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(
+ maxIdleConnections,
+ keepAliveDurationMs,
+ maxTotalConnections,
+ connectionTimeoutMs,
+ reuseEnabled,
+ monitoringEnabled);
+ }
+ }
/**
* Creates or retrieves a cached HTTP client with the specified configuration.
*
* <p>This method implements reference-counted client pooling. Clients with identical timeout
- * settings are shared across multiple callers.
+ * and pool settings are shared across multiple callers.
*
- * @param timeoutMs Timeout in milliseconds for connect, read, and write operations
+ * @param timeoutMs Timeout in milliseconds for read and write operations
+ * @param poolConfig Connection pool configuration
* @return A shared or new OkHttpClient instance
*/
- public static OkHttpClient createHttpClient(long timeoutMs) {
+ public static OkHttpClient createHttpClient(long timeoutMs, ConnectionPoolConfig poolConfig) {
+ ClientKey key = new ClientKey(timeoutMs, poolConfig);
+
synchronized (LOCK) {
- ClientValue value = cache.get(timeoutMs);
+ ClientValue value = cache.get(key);
if (value != null) {
- LOG.debug("Returning an existing Triton HTTP client.");
+ LOG.debug("Returning existing Triton HTTP client (reference count: {}).",
+ value.referenceCount.get() + 1);
value.referenceCount.incrementAndGet();
Review Comment:
✅ Fixed: Moved incrementAndGet() before LOG.debug to avoid side effects in logging. Updated in commit 3eb6e7b7f1a.
##########
flink-models/flink-model-triton/src/main/java/org/apache/flink/model/triton/TritonUtils.java:
##########
@@ -51,40 +66,148 @@ public class TritonUtils {
private static final Object LOCK = new Object();
- private static final Map<Long, ClientValue> cache = new HashMap<>();
+ private static final Map<ClientKey, ClientValue> cache = new HashMap<>();
+
+ /** Connection pool configuration holder. */
+ public static class ConnectionPoolConfig {
+ public final int maxIdleConnections;
+ public final long keepAliveDurationMs;
+ public final int maxTotalConnections;
+ public final long connectionTimeoutMs;
+ public final boolean reuseEnabled;
+ public final boolean monitoringEnabled;
+
+ public ConnectionPoolConfig(
+ int maxIdleConnections,
+ long keepAliveDurationMs,
+ int maxTotalConnections,
+ long connectionTimeoutMs,
+ boolean reuseEnabled,
+ boolean monitoringEnabled) {
+ this.maxIdleConnections = maxIdleConnections;
+ this.keepAliveDurationMs = keepAliveDurationMs;
+ this.maxTotalConnections = maxTotalConnections;
+ this.connectionTimeoutMs = connectionTimeoutMs;
+ this.reuseEnabled = reuseEnabled;
+ this.monitoringEnabled = monitoringEnabled;
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) return true;
+ if (o == null || getClass() != o.getClass()) return false;
+ ConnectionPoolConfig that = (ConnectionPoolConfig) o;
+ return maxIdleConnections == that.maxIdleConnections
+ && keepAliveDurationMs == that.keepAliveDurationMs
+ && maxTotalConnections == that.maxTotalConnections
+ && connectionTimeoutMs == that.connectionTimeoutMs
+ && reuseEnabled == that.reuseEnabled
+ && monitoringEnabled == that.monitoringEnabled;
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(
+ maxIdleConnections,
+ keepAliveDurationMs,
+ maxTotalConnections,
+ connectionTimeoutMs,
+ reuseEnabled,
+ monitoringEnabled);
+ }
+ }
/**
* Creates or retrieves a cached HTTP client with the specified configuration.
*
* <p>This method implements reference-counted client pooling. Clients with identical timeout
- * settings are shared across multiple callers.
+ * and pool settings are shared across multiple callers.
*
- * @param timeoutMs Timeout in milliseconds for connect, read, and write operations
+ * @param timeoutMs Timeout in milliseconds for read and write operations
+ * @param poolConfig Connection pool configuration
* @return A shared or new OkHttpClient instance
*/
- public static OkHttpClient createHttpClient(long timeoutMs) {
+ public static OkHttpClient createHttpClient(long timeoutMs, ConnectionPoolConfig poolConfig) {
+ ClientKey key = new ClientKey(timeoutMs, poolConfig);
+
synchronized (LOCK) {
- ClientValue value = cache.get(timeoutMs);
+ ClientValue value = cache.get(key);
if (value != null) {
- LOG.debug("Returning an existing Triton HTTP client.");
+ LOG.debug("Returning existing Triton HTTP client (reference count: {}).",
+ value.referenceCount.get() + 1);
value.referenceCount.incrementAndGet();
return value.client;
}
- LOG.debug("Building a new Triton HTTP client.");
+ LOG.info("Building new Triton HTTP client with connection pool configuration.");
+
+ // Configure connection pool
+ ConnectionPool connectionPool;
+ if (poolConfig.reuseEnabled) {
+ connectionPool =
+ new ConnectionPool(
+ poolConfig.maxIdleConnections,
+ poolConfig.keepAliveDurationMs,
+ TimeUnit.MILLISECONDS);
+ } else {
+ // Disable pooling by setting maxIdle to 0
+ connectionPool = new ConnectionPool(0, 1, TimeUnit.MILLISECONDS);
+ }
+
+ // Configure dispatcher for concurrent requests
+ Dispatcher dispatcher = new Dispatcher();
+ dispatcher.setMaxRequests(poolConfig.maxTotalConnections);
+ dispatcher.setMaxRequestsPerHost(poolConfig.maxTotalConnections);
+
+ // Build HTTP client
OkHttpClient client =
new OkHttpClient.Builder()
- .connectTimeout(timeoutMs, TimeUnit.MILLISECONDS)
+ .connectTimeout(poolConfig.connectionTimeoutMs, TimeUnit.MILLISECONDS)
.readTimeout(timeoutMs, TimeUnit.MILLISECONDS)
.writeTimeout(timeoutMs, TimeUnit.MILLISECONDS)
+ .connectionPool(connectionPool)
+ .dispatcher(dispatcher)
.retryOnConnectionFailure(true)
.build();
- cache.put(timeoutMs, new ClientValue(client));
+ ClientValue clientValue = new ClientValue(client, poolConfig);
+ cache.put(key, clientValue);
+
+ // Start monitoring if enabled
+ if (poolConfig.monitoringEnabled) {
+ clientValue.startMonitoring();
+ }
+
+ LOG.info(
+ "Triton HTTP client created - Pool: maxIdle={}, keepAlive={}ms, maxTotal={}, connTimeout={}ms",
+ poolConfig.maxIdleConnections,
+ poolConfig.keepAliveDurationMs,
+ poolConfig.maxTotalConnections,
+ poolConfig.connectionTimeoutMs);
+
return client;
}
}
+ /**
+ * Backward compatibility: creates client with default pool configuration.
+ *
+ * @param timeoutMs Timeout in milliseconds
+ * @return OkHttpClient instance
+ */
+ public static OkHttpClient createHttpClient(long timeoutMs) {
+ ConnectionPoolConfig defaultConfig =
+ new ConnectionPoolConfig(
+ 20, // maxIdleConnections
+ 300_000, // keepAliveDurationMs (5 minutes)
Review Comment:
The underscores in numeric literals (e.g., 300_000, 10_000) are valid Java syntax since Java 7, used to improve readability of large numbers. This is a common practice in Java codebases including Flink.
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Re: [PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
Posted by "featzhang (via GitHub)" <gi...@apache.org>.
featzhang commented on code in PR #27568:
URL: https://github.com/apache/flink/pull/27568#discussion_r3121308124
##########
flink-models/flink-model-triton/src/main/java/org/apache/flink/model/triton/TritonUtils.java:
##########
@@ -51,40 +66,148 @@ public class TritonUtils {
private static final Object LOCK = new Object();
- private static final Map<Long, ClientValue> cache = new HashMap<>();
+ private static final Map<ClientKey, ClientValue> cache = new HashMap<>();
+
+ /** Connection pool configuration holder. */
+ public static class ConnectionPoolConfig {
+ public final int maxIdleConnections;
+ public final long keepAliveDurationMs;
+ public final int maxTotalConnections;
+ public final long connectionTimeoutMs;
+ public final boolean reuseEnabled;
+ public final boolean monitoringEnabled;
+
+ public ConnectionPoolConfig(
+ int maxIdleConnections,
+ long keepAliveDurationMs,
+ int maxTotalConnections,
+ long connectionTimeoutMs,
+ boolean reuseEnabled,
+ boolean monitoringEnabled) {
+ this.maxIdleConnections = maxIdleConnections;
+ this.keepAliveDurationMs = keepAliveDurationMs;
+ this.maxTotalConnections = maxTotalConnections;
+ this.connectionTimeoutMs = connectionTimeoutMs;
+ this.reuseEnabled = reuseEnabled;
+ this.monitoringEnabled = monitoringEnabled;
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) return true;
+ if (o == null || getClass() != o.getClass()) return false;
+ ConnectionPoolConfig that = (ConnectionPoolConfig) o;
+ return maxIdleConnections == that.maxIdleConnections
+ && keepAliveDurationMs == that.keepAliveDurationMs
+ && maxTotalConnections == that.maxTotalConnections
+ && connectionTimeoutMs == that.connectionTimeoutMs
+ && reuseEnabled == that.reuseEnabled
+ && monitoringEnabled == that.monitoringEnabled;
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(
+ maxIdleConnections,
+ keepAliveDurationMs,
+ maxTotalConnections,
+ connectionTimeoutMs,
+ reuseEnabled,
+ monitoringEnabled);
+ }
+ }
/**
* Creates or retrieves a cached HTTP client with the specified configuration.
*
* <p>This method implements reference-counted client pooling. Clients with identical timeout
- * settings are shared across multiple callers.
+ * and pool settings are shared across multiple callers.
*
- * @param timeoutMs Timeout in milliseconds for connect, read, and write operations
+ * @param timeoutMs Timeout in milliseconds for read and write operations
+ * @param poolConfig Connection pool configuration
* @return A shared or new OkHttpClient instance
*/
- public static OkHttpClient createHttpClient(long timeoutMs) {
+ public static OkHttpClient createHttpClient(long timeoutMs, ConnectionPoolConfig poolConfig) {
+ ClientKey key = new ClientKey(timeoutMs, poolConfig);
+
synchronized (LOCK) {
- ClientValue value = cache.get(timeoutMs);
+ ClientValue value = cache.get(key);
if (value != null) {
- LOG.debug("Returning an existing Triton HTTP client.");
+ LOG.debug("Returning existing Triton HTTP client (reference count: {}).",
+ value.referenceCount.get() + 1);
value.referenceCount.incrementAndGet();
return value.client;
}
- LOG.debug("Building a new Triton HTTP client.");
+ LOG.info("Building new Triton HTTP client with connection pool configuration.");
+
+ // Configure connection pool
+ ConnectionPool connectionPool;
+ if (poolConfig.reuseEnabled) {
+ connectionPool =
+ new ConnectionPool(
+ poolConfig.maxIdleConnections,
+ poolConfig.keepAliveDurationMs,
+ TimeUnit.MILLISECONDS);
+ } else {
+ // Disable pooling by setting maxIdle to 0
+ connectionPool = new ConnectionPool(0, 1, TimeUnit.MILLISECONDS);
+ }
+
+ // Configure dispatcher for concurrent requests
+ Dispatcher dispatcher = new Dispatcher();
+ dispatcher.setMaxRequests(poolConfig.maxTotalConnections);
+ dispatcher.setMaxRequestsPerHost(poolConfig.maxTotalConnections);
Review Comment:
✅ Fixed: Added a comment explaining that `setMaxRequestsPerHost` uses `maxTotalConnections` because we typically connect to a single Triton server endpoint, which allows full utilization of the connection pool without artificial per-host limits. Updated in commit 3eb6e7b7f1a.
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Re: [PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
Posted by "featzhang (via GitHub)" <gi...@apache.org>.
featzhang commented on PR #27568:
URL: https://github.com/apache/flink/pull/27568#issuecomment-4296922085
@davidradl Hi! The CI checks haven't been triggered yet for the latest commit (3eb6e7b7).
Could you please trigger the Azure Pipelines for this PR? All 19 review comments have been addressed.
Thank you!
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Re: [PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
Posted by "featzhang (via GitHub)" <gi...@apache.org>.
featzhang commented on PR #27568:
URL: https://github.com/apache/flink/pull/27568#issuecomment-4327491861
@flinkbot run azure
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Re: [PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
Posted by "featzhang (via GitHub)" <gi...@apache.org>.
featzhang commented on code in PR #27568:
URL: https://github.com/apache/flink/pull/27568#discussion_r3121307314
##########
flink-models/flink-model-triton/src/main/java/org/apache/flink/model/triton/TritonUtils.java:
##########
@@ -51,40 +66,148 @@ public class TritonUtils {
private static final Object LOCK = new Object();
- private static final Map<Long, ClientValue> cache = new HashMap<>();
+ private static final Map<ClientKey, ClientValue> cache = new HashMap<>();
+
+ /** Connection pool configuration holder. */
+ public static class ConnectionPoolConfig {
Review Comment:
✅ Fixed: Moved ConnectionPoolConfig to its own file (ConnectionPoolConfig.java) for better code organization and following Java best practices. Updated in commit 3eb6e7b7f1a.
##########
flink-models/flink-model-triton/src/main/java/org/apache/flink/model/triton/TritonOptions.java:
##########
@@ -165,4 +165,89 @@ private TritonOptions() {
+ "Example: %s",
code("'X-Custom-Header:value,X-Another:value2'"))
.build());
+
+ // ========== Connection Pool Management Options ==========
+
+ public static final ConfigOption<Integer> CONNECTION_POOL_MAX_IDLE =
+ ConfigOptions.key("connection-pool-max-idle")
+ .intType()
+ .defaultValue(20)
+ .withDescription(
+ Description.builder()
+ .text(
+ "Maximum number of idle connections to keep in the pool. "
+ + "Higher values reduce connection setup overhead but consume more memory. "
+ + "Recommended: 10-50 depending on parallelism and QPS. "
+ + "Defaults to 20.")
+ .build());
+
+ public static final ConfigOption<Duration> CONNECTION_POOL_KEEP_ALIVE =
+ ConfigOptions.key("connection-pool-keep-alive")
+ .durationType()
+ .defaultValue(Duration.ofSeconds(300))
+ .withDescription(
+ Description.builder()
+ .text(
+ "Duration to keep idle connections alive in the pool before eviction. "
+ + "Longer durations reduce connection setup overhead but may keep stale connections. "
+ + "Recommended: 60s-600s. "
+ + "Defaults to 300s (5 minutes).")
+ .build());
+
+ public static final ConfigOption<Integer> CONNECTION_POOL_MAX_TOTAL =
+ ConfigOptions.key("connection-pool-max-total")
+ .intType()
+ .defaultValue(100)
+ .withDescription(
+ Description.builder()
+ .text(
+ "Maximum total number of connections across all routes. "
Review Comment:
✅ Fixed: Clarified that "route" means "unique host:port combinations" in the documentation. Updated in commit 3eb6e7b7f1a.
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Re: [PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
Posted by "davidradl (via GitHub)" <gi...@apache.org>.
davidradl commented on code in PR #27568:
URL: https://github.com/apache/flink/pull/27568#discussion_r2787926939
##########
flink-models/flink-model-triton/src/main/java/org/apache/flink/model/triton/TritonOptions.java:
##########
@@ -165,4 +165,89 @@ private TritonOptions() {
+ "Example: %s",
code("'X-Custom-Header:value,X-Another:value2'"))
.build());
+
+ // ========== Connection Pool Management Options ==========
+
+ public static final ConfigOption<Integer> CONNECTION_POOL_MAX_IDLE =
+ ConfigOptions.key("connection-pool-max-idle")
+ .intType()
+ .defaultValue(20)
+ .withDescription(
+ Description.builder()
+ .text(
+ "Maximum number of idle connections to keep in the pool. "
+ + "Higher values reduce connection setup overhead but consume more memory. "
+ + "Recommended: 10-50 depending on parallelism and QPS. "
Review Comment:
what is QPS?
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Re: [PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
Posted by "davidradl (via GitHub)" <gi...@apache.org>.
davidradl commented on code in PR #27568:
URL: https://github.com/apache/flink/pull/27568#discussion_r2787880853
##########
flink-models/flink-model-triton/src/main/java/org/apache/flink/model/triton/TritonUtils.java:
##########
@@ -51,40 +66,148 @@ public class TritonUtils {
private static final Object LOCK = new Object();
- private static final Map<Long, ClientValue> cache = new HashMap<>();
+ private static final Map<ClientKey, ClientValue> cache = new HashMap<>();
+
+ /** Connection pool configuration holder. */
+ public static class ConnectionPoolConfig {
+ public final int maxIdleConnections;
+ public final long keepAliveDurationMs;
+ public final int maxTotalConnections;
+ public final long connectionTimeoutMs;
+ public final boolean reuseEnabled;
+ public final boolean monitoringEnabled;
+
+ public ConnectionPoolConfig(
+ int maxIdleConnections,
+ long keepAliveDurationMs,
+ int maxTotalConnections,
+ long connectionTimeoutMs,
+ boolean reuseEnabled,
+ boolean monitoringEnabled) {
+ this.maxIdleConnections = maxIdleConnections;
+ this.keepAliveDurationMs = keepAliveDurationMs;
+ this.maxTotalConnections = maxTotalConnections;
+ this.connectionTimeoutMs = connectionTimeoutMs;
+ this.reuseEnabled = reuseEnabled;
+ this.monitoringEnabled = monitoringEnabled;
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) return true;
+ if (o == null || getClass() != o.getClass()) return false;
+ ConnectionPoolConfig that = (ConnectionPoolConfig) o;
+ return maxIdleConnections == that.maxIdleConnections
+ && keepAliveDurationMs == that.keepAliveDurationMs
+ && maxTotalConnections == that.maxTotalConnections
+ && connectionTimeoutMs == that.connectionTimeoutMs
+ && reuseEnabled == that.reuseEnabled
+ && monitoringEnabled == that.monitoringEnabled;
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(
+ maxIdleConnections,
+ keepAliveDurationMs,
+ maxTotalConnections,
+ connectionTimeoutMs,
+ reuseEnabled,
+ monitoringEnabled);
+ }
+ }
/**
* Creates or retrieves a cached HTTP client with the specified configuration.
*
* <p>This method implements reference-counted client pooling. Clients with identical timeout
- * settings are shared across multiple callers.
+ * and pool settings are shared across multiple callers.
*
- * @param timeoutMs Timeout in milliseconds for connect, read, and write operations
+ * @param timeoutMs Timeout in milliseconds for read and write operations
+ * @param poolConfig Connection pool configuration
* @return A shared or new OkHttpClient instance
*/
- public static OkHttpClient createHttpClient(long timeoutMs) {
+ public static OkHttpClient createHttpClient(long timeoutMs, ConnectionPoolConfig poolConfig) {
+ ClientKey key = new ClientKey(timeoutMs, poolConfig);
+
synchronized (LOCK) {
- ClientValue value = cache.get(timeoutMs);
+ ClientValue value = cache.get(key);
if (value != null) {
- LOG.debug("Returning an existing Triton HTTP client.");
+ LOG.debug("Returning existing Triton HTTP client (reference count: {}).",
+ value.referenceCount.get() + 1);
value.referenceCount.incrementAndGet();
Review Comment:
why not but the DEBUG after the value.referenceCount.incrementAndGet(); so you do not need to increment it in the debug string. Maybe
```
AtomicInteger newReferenceCount = value.referenceCount.incrementAndGet();
LOG.debug("Returning existing Triton HTTP client (reference count: {}).", newReferenceCount );
```
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Re: [PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
Posted by "featzhang (via GitHub)" <gi...@apache.org>.
featzhang closed pull request #27568: [FLINK-38857][models] Add HTTP connection pool management for Triton inference
URL: https://github.com/apache/flink/pull/27568
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Re: [PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
Posted by "davidradl (via GitHub)" <gi...@apache.org>.
davidradl commented on code in PR #27568:
URL: https://github.com/apache/flink/pull/27568#discussion_r2787935984
##########
flink-models/flink-model-triton/src/main/java/org/apache/flink/model/triton/TritonOptions.java:
##########
@@ -165,4 +165,89 @@ private TritonOptions() {
+ "Example: %s",
code("'X-Custom-Header:value,X-Another:value2'"))
.build());
+
+ // ========== Connection Pool Management Options ==========
+
+ public static final ConfigOption<Integer> CONNECTION_POOL_MAX_IDLE =
+ ConfigOptions.key("connection-pool-max-idle")
+ .intType()
+ .defaultValue(20)
+ .withDescription(
+ Description.builder()
+ .text(
+ "Maximum number of idle connections to keep in the pool. "
+ + "Higher values reduce connection setup overhead but consume more memory. "
+ + "Recommended: 10-50 depending on parallelism and QPS. "
+ + "Defaults to 20.")
+ .build());
+
+ public static final ConfigOption<Duration> CONNECTION_POOL_KEEP_ALIVE =
+ ConfigOptions.key("connection-pool-keep-alive")
+ .durationType()
+ .defaultValue(Duration.ofSeconds(300))
+ .withDescription(
+ Description.builder()
+ .text(
+ "Duration to keep idle connections alive in the pool before eviction. "
+ + "Longer durations reduce connection setup overhead but may keep stale connections. "
+ + "Recommended: 60s-600s. "
+ + "Defaults to 300s (5 minutes).")
+ .build());
+
+ public static final ConfigOption<Integer> CONNECTION_POOL_MAX_TOTAL =
+ ConfigOptions.key("connection-pool-max-total")
+ .intType()
+ .defaultValue(100)
+ .withDescription(
+ Description.builder()
+ .text(
+ "Maximum total number of connections across all routes. "
+ + "This limits the overall number of concurrent connections. "
+ + "Should be >= max-concurrent-requests to avoid blocking. "
+ + "Recommended: 50-200 depending on expected load. "
+ + "Defaults to 100.")
+ .build());
+
+ public static final ConfigOption<Duration> CONNECTION_TIMEOUT =
+ ConfigOptions.key("connection-timeout")
+ .durationType()
+ .defaultValue(Duration.ofSeconds(10))
+ .withDescription(
+ Description.builder()
+ .text(
+ "Timeout for establishing a new connection to Triton server. "
+ + "Shorter timeouts fail fast but may cause false negatives on slow networks. "
+ + "Should be less than overall %s. "
Review Comment:
can we validate it is less than timeout
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Re: [PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
Posted by "davidradl (via GitHub)" <gi...@apache.org>.
davidradl commented on code in PR #27568:
URL: https://github.com/apache/flink/pull/27568#discussion_r2787946739
##########
flink-models/flink-model-triton/src/main/java/org/apache/flink/model/triton/TritonUtils.java:
##########
@@ -51,40 +66,148 @@ public class TritonUtils {
private static final Object LOCK = new Object();
- private static final Map<Long, ClientValue> cache = new HashMap<>();
+ private static final Map<ClientKey, ClientValue> cache = new HashMap<>();
+
+ /** Connection pool configuration holder. */
+ public static class ConnectionPoolConfig {
Review Comment:
I was not expecting a class like this to be defined in a utils class. Is there a reason for it not be in its own file ?
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Re: [PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
Posted by "davidradl (via GitHub)" <gi...@apache.org>.
davidradl commented on code in PR #27568:
URL: https://github.com/apache/flink/pull/27568#discussion_r2787894638
##########
flink-models/flink-model-triton/src/main/java/org/apache/flink/model/triton/TritonUtils.java:
##########
@@ -51,40 +66,148 @@ public class TritonUtils {
private static final Object LOCK = new Object();
- private static final Map<Long, ClientValue> cache = new HashMap<>();
+ private static final Map<ClientKey, ClientValue> cache = new HashMap<>();
+
+ /** Connection pool configuration holder. */
+ public static class ConnectionPoolConfig {
+ public final int maxIdleConnections;
+ public final long keepAliveDurationMs;
+ public final int maxTotalConnections;
+ public final long connectionTimeoutMs;
+ public final boolean reuseEnabled;
+ public final boolean monitoringEnabled;
+
+ public ConnectionPoolConfig(
+ int maxIdleConnections,
+ long keepAliveDurationMs,
+ int maxTotalConnections,
+ long connectionTimeoutMs,
+ boolean reuseEnabled,
+ boolean monitoringEnabled) {
+ this.maxIdleConnections = maxIdleConnections;
+ this.keepAliveDurationMs = keepAliveDurationMs;
+ this.maxTotalConnections = maxTotalConnections;
+ this.connectionTimeoutMs = connectionTimeoutMs;
+ this.reuseEnabled = reuseEnabled;
+ this.monitoringEnabled = monitoringEnabled;
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) return true;
+ if (o == null || getClass() != o.getClass()) return false;
+ ConnectionPoolConfig that = (ConnectionPoolConfig) o;
+ return maxIdleConnections == that.maxIdleConnections
+ && keepAliveDurationMs == that.keepAliveDurationMs
+ && maxTotalConnections == that.maxTotalConnections
+ && connectionTimeoutMs == that.connectionTimeoutMs
+ && reuseEnabled == that.reuseEnabled
+ && monitoringEnabled == that.monitoringEnabled;
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(
+ maxIdleConnections,
+ keepAliveDurationMs,
+ maxTotalConnections,
+ connectionTimeoutMs,
+ reuseEnabled,
+ monitoringEnabled);
+ }
+ }
/**
* Creates or retrieves a cached HTTP client with the specified configuration.
*
* <p>This method implements reference-counted client pooling. Clients with identical timeout
- * settings are shared across multiple callers.
+ * and pool settings are shared across multiple callers.
*
- * @param timeoutMs Timeout in milliseconds for connect, read, and write operations
+ * @param timeoutMs Timeout in milliseconds for read and write operations
+ * @param poolConfig Connection pool configuration
* @return A shared or new OkHttpClient instance
*/
- public static OkHttpClient createHttpClient(long timeoutMs) {
+ public static OkHttpClient createHttpClient(long timeoutMs, ConnectionPoolConfig poolConfig) {
+ ClientKey key = new ClientKey(timeoutMs, poolConfig);
+
synchronized (LOCK) {
- ClientValue value = cache.get(timeoutMs);
+ ClientValue value = cache.get(key);
if (value != null) {
- LOG.debug("Returning an existing Triton HTTP client.");
+ LOG.debug("Returning existing Triton HTTP client (reference count: {}).",
+ value.referenceCount.get() + 1);
value.referenceCount.incrementAndGet();
return value.client;
}
- LOG.debug("Building a new Triton HTTP client.");
+ LOG.info("Building new Triton HTTP client with connection pool configuration.");
+
+ // Configure connection pool
+ ConnectionPool connectionPool;
+ if (poolConfig.reuseEnabled) {
+ connectionPool =
+ new ConnectionPool(
+ poolConfig.maxIdleConnections,
+ poolConfig.keepAliveDurationMs,
+ TimeUnit.MILLISECONDS);
+ } else {
+ // Disable pooling by setting maxIdle to 0
+ connectionPool = new ConnectionPool(0, 1, TimeUnit.MILLISECONDS);
+ }
+
+ // Configure dispatcher for concurrent requests
+ Dispatcher dispatcher = new Dispatcher();
+ dispatcher.setMaxRequests(poolConfig.maxTotalConnections);
+ dispatcher.setMaxRequestsPerHost(poolConfig.maxTotalConnections);
+
+ // Build HTTP client
OkHttpClient client =
new OkHttpClient.Builder()
- .connectTimeout(timeoutMs, TimeUnit.MILLISECONDS)
+ .connectTimeout(poolConfig.connectionTimeoutMs, TimeUnit.MILLISECONDS)
.readTimeout(timeoutMs, TimeUnit.MILLISECONDS)
.writeTimeout(timeoutMs, TimeUnit.MILLISECONDS)
+ .connectionPool(connectionPool)
+ .dispatcher(dispatcher)
.retryOnConnectionFailure(true)
.build();
- cache.put(timeoutMs, new ClientValue(client));
+ ClientValue clientValue = new ClientValue(client, poolConfig);
+ cache.put(key, clientValue);
+
+ // Start monitoring if enabled
+ if (poolConfig.monitoringEnabled) {
+ clientValue.startMonitoring();
+ }
+
+ LOG.info(
+ "Triton HTTP client created - Pool: maxIdle={}, keepAlive={}ms, maxTotal={}, connTimeout={}ms",
+ poolConfig.maxIdleConnections,
+ poolConfig.keepAliveDurationMs,
+ poolConfig.maxTotalConnections,
+ poolConfig.connectionTimeoutMs);
+
return client;
}
}
+ /**
+ * Backward compatibility: creates client with default pool configuration.
+ *
+ * @param timeoutMs Timeout in milliseconds
+ * @return OkHttpClient instance
+ */
+ public static OkHttpClient createHttpClient(long timeoutMs) {
+ ConnectionPoolConfig defaultConfig =
+ new ConnectionPoolConfig(
+ 20, // maxIdleConnections
+ 300_000, // keepAliveDurationMs (5 minutes)
Review Comment:
I am unsure why we are using underscores here?
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Re: [PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
Posted by "davidradl (via GitHub)" <gi...@apache.org>.
davidradl commented on code in PR #27568:
URL: https://github.com/apache/flink/pull/27568#discussion_r2787912770
##########
flink-models/flink-model-triton/src/main/java/org/apache/flink/model/triton/TritonUtils.java:
##########
@@ -51,40 +66,148 @@ public class TritonUtils {
private static final Object LOCK = new Object();
- private static final Map<Long, ClientValue> cache = new HashMap<>();
+ private static final Map<ClientKey, ClientValue> cache = new HashMap<>();
+
+ /** Connection pool configuration holder. */
+ public static class ConnectionPoolConfig {
+ public final int maxIdleConnections;
+ public final long keepAliveDurationMs;
+ public final int maxTotalConnections;
+ public final long connectionTimeoutMs;
+ public final boolean reuseEnabled;
+ public final boolean monitoringEnabled;
+
+ public ConnectionPoolConfig(
+ int maxIdleConnections,
+ long keepAliveDurationMs,
+ int maxTotalConnections,
+ long connectionTimeoutMs,
+ boolean reuseEnabled,
+ boolean monitoringEnabled) {
+ this.maxIdleConnections = maxIdleConnections;
+ this.keepAliveDurationMs = keepAliveDurationMs;
+ this.maxTotalConnections = maxTotalConnections;
+ this.connectionTimeoutMs = connectionTimeoutMs;
+ this.reuseEnabled = reuseEnabled;
+ this.monitoringEnabled = monitoringEnabled;
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) return true;
+ if (o == null || getClass() != o.getClass()) return false;
+ ConnectionPoolConfig that = (ConnectionPoolConfig) o;
+ return maxIdleConnections == that.maxIdleConnections
+ && keepAliveDurationMs == that.keepAliveDurationMs
+ && maxTotalConnections == that.maxTotalConnections
+ && connectionTimeoutMs == that.connectionTimeoutMs
+ && reuseEnabled == that.reuseEnabled
+ && monitoringEnabled == that.monitoringEnabled;
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(
+ maxIdleConnections,
+ keepAliveDurationMs,
+ maxTotalConnections,
+ connectionTimeoutMs,
+ reuseEnabled,
+ monitoringEnabled);
+ }
+ }
/**
* Creates or retrieves a cached HTTP client with the specified configuration.
*
* <p>This method implements reference-counted client pooling. Clients with identical timeout
- * settings are shared across multiple callers.
+ * and pool settings are shared across multiple callers.
*
- * @param timeoutMs Timeout in milliseconds for connect, read, and write operations
+ * @param timeoutMs Timeout in milliseconds for read and write operations
+ * @param poolConfig Connection pool configuration
* @return A shared or new OkHttpClient instance
*/
- public static OkHttpClient createHttpClient(long timeoutMs) {
+ public static OkHttpClient createHttpClient(long timeoutMs, ConnectionPoolConfig poolConfig) {
+ ClientKey key = new ClientKey(timeoutMs, poolConfig);
+
synchronized (LOCK) {
Review Comment:
can I suggest a more descriptive name that LOCK. Maybe CACHE_LOCK or better still synchronize on the cache and remove the extra object.
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Re: [PR] [FLINK-38857][models] Add HTTP connection pool management for Triton inference [flink]
Posted by "featzhang (via GitHub)" <gi...@apache.org>.
featzhang commented on code in PR #27568:
URL: https://github.com/apache/flink/pull/27568#discussion_r3121305949
##########
flink-models/flink-model-triton/src/main/java/org/apache/flink/model/triton/TritonUtils.java:
##########
@@ -51,40 +66,148 @@ public class TritonUtils {
private static final Object LOCK = new Object();
- private static final Map<Long, ClientValue> cache = new HashMap<>();
+ private static final Map<ClientKey, ClientValue> cache = new HashMap<>();
+
+ /** Connection pool configuration holder. */
+ public static class ConnectionPoolConfig {
+ public final int maxIdleConnections;
+ public final long keepAliveDurationMs;
+ public final int maxTotalConnections;
+ public final long connectionTimeoutMs;
+ public final boolean reuseEnabled;
+ public final boolean monitoringEnabled;
+
+ public ConnectionPoolConfig(
+ int maxIdleConnections,
+ long keepAliveDurationMs,
+ int maxTotalConnections,
+ long connectionTimeoutMs,
+ boolean reuseEnabled,
+ boolean monitoringEnabled) {
+ this.maxIdleConnections = maxIdleConnections;
+ this.keepAliveDurationMs = keepAliveDurationMs;
+ this.maxTotalConnections = maxTotalConnections;
+ this.connectionTimeoutMs = connectionTimeoutMs;
+ this.reuseEnabled = reuseEnabled;
+ this.monitoringEnabled = monitoringEnabled;
+ }
+
+ @Override
+ public boolean equals(Object o) {
+ if (this == o) return true;
+ if (o == null || getClass() != o.getClass()) return false;
+ ConnectionPoolConfig that = (ConnectionPoolConfig) o;
+ return maxIdleConnections == that.maxIdleConnections
+ && keepAliveDurationMs == that.keepAliveDurationMs
+ && maxTotalConnections == that.maxTotalConnections
+ && connectionTimeoutMs == that.connectionTimeoutMs
+ && reuseEnabled == that.reuseEnabled
+ && monitoringEnabled == that.monitoringEnabled;
+ }
+
+ @Override
+ public int hashCode() {
+ return Objects.hash(
+ maxIdleConnections,
+ keepAliveDurationMs,
+ maxTotalConnections,
+ connectionTimeoutMs,
+ reuseEnabled,
+ monitoringEnabled);
+ }
+ }
/**
* Creates or retrieves a cached HTTP client with the specified configuration.
*
* <p>This method implements reference-counted client pooling. Clients with identical timeout
- * settings are shared across multiple callers.
+ * and pool settings are shared across multiple callers.
*
- * @param timeoutMs Timeout in milliseconds for connect, read, and write operations
+ * @param timeoutMs Timeout in milliseconds for read and write operations
+ * @param poolConfig Connection pool configuration
* @return A shared or new OkHttpClient instance
*/
- public static OkHttpClient createHttpClient(long timeoutMs) {
+ public static OkHttpClient createHttpClient(long timeoutMs, ConnectionPoolConfig poolConfig) {
+ ClientKey key = new ClientKey(timeoutMs, poolConfig);
+
synchronized (LOCK) {
Review Comment:
✅ Fixed: Renamed LOCK to CACHE_LOCK for better clarity. Updated in commit 3eb6e7b7f1a.
##########
flink-models/flink-model-triton/src/main/java/org/apache/flink/model/triton/TritonOptions.java:
##########
@@ -165,4 +165,89 @@ private TritonOptions() {
+ "Example: %s",
code("'X-Custom-Header:value,X-Another:value2'"))
.build());
+
+ // ========== Connection Pool Management Options ==========
+
+ public static final ConfigOption<Integer> CONNECTION_POOL_MAX_IDLE =
+ ConfigOptions.key("connection-pool-max-idle")
+ .intType()
+ .defaultValue(20)
+ .withDescription(
+ Description.builder()
+ .text(
+ "Maximum number of idle connections to keep in the pool. "
+ + "Higher values reduce connection setup overhead but consume more memory. "
+ + "Recommended: 10-50 depending on parallelism and QPS. "
Review Comment:
✅ Fixed: Added explanation that QPS means "Queries Per Second". Updated in commit 3eb6e7b7f1a.
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