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Reduce shutdown latency by parallelizing session destruction #398

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Reduce shutdown latency by parallelizing session destruction #398

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⚡ Bolt: Parallelize session destruction in Node.js SDK
google-labs-jules[bot] Feb 6, 2026
e436065
Merge pull request #1 from AkCodes23/bolt-parallel-stop-nodejs-138360…
AkCodes23 Feb 7, 2026
52c48f1
Merge branch 'github:main' into main
AkCodes23 Feb 7, 2026
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3 changes: 3 additions & 0 deletions .jules/bolt.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,3 @@
## 2025-05-15 - [Sequential session destruction in SDKs]
**Learning:** All Copilot SDKs (Node.js, Python, Go, .NET) were initially implementing session destruction sequentially during client shutdown. This leads to a linear increase in shutdown time as the number of active sessions grows, especially when individual destructions involve retries and backoff.
**Action:** Parallelize session cleanup using language-specific concurrency primitives (e.g., `Promise.all` in Node.js, `asyncio.gather` in Python, `Task.WhenAll` in .NET, or WaitGroups/Channels in Go) to ensure shutdown time remains constant and minimal.
18 changes: 12 additions & 6 deletions nodejs/src/client.ts
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Expand Up @@ -298,8 +298,8 @@ export class CopilotClient {
async stop(): Promise<Error[]> {
const errors: Error[] = [];

// Destroy all active sessions with retry logic
for (const session of this.sessions.values()) {
// Destroy all active sessions in parallel with retry logic
const sessionPromises = Array.from(this.sessions.values()).map(async (session) => {
const sessionId = session.sessionId;
let lastError: Error | null = null;
Comment on lines +301 to 304
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Copilot AI Feb 7, 2026

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Using Array.from(this.sessions.values()) snapshots the sessions at the start of stop(). If a session is created/resumed while stop() is running, it won’t be destroyed but will still be removed by this.sessions.clear(), which can skip session.destroy() cleanup (and differs from the previous live Map iteration behavior). Consider blocking session creation while stopping (e.g., a stopping flag/state checked in createSession/resumeSession) or draining the map as you schedule destructions so sessions added during shutdown are either rejected or deterministically cleaned up.

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@AkCodes23 AkCodes23 Feb 7, 2026

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@copilot open a new pull request to apply changes based on this feedback


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Copilot AI Feb 10, 2026

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There’s no direct unit test coverage for the updated shutdown behavior (parallel destruction + error aggregation). Adding a focused test for stop() (e.g., multiple mock sessions with controlled destroy() delays/failures) would help ensure it still waits for all destructions, returns all per-session errors, and only clears this.sessions after completion.

Copilot uses AI. Check for mistakes.
Expand All @@ -321,12 +321,18 @@ export class CopilotClient {
}

if (lastError) {
errors.push(
new Error(
`Failed to destroy session ${sessionId} after 3 attempts: ${lastError.message}`
)
return new Error(
`Failed to destroy session ${sessionId} after 3 attempts: ${lastError.message}`
);
}
return null;
});

const results = await Promise.all(sessionPromises);
for (const result of results) {
if (result instanceof Error) {
errors.push(result);
}
}
this.sessions.clear();

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