Pawan-Bishnoi

Release Diff: mesh.canary_1_23 — 1.0.41 vs 1.0.50

Service: istiod
Pipeline: deploy-canary-revision
Branch: release-1.23

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Helm Charts (istio-installer-helm-charts) — 5 commits (ff408e0 → 5a8810e)

Pawan-Bishnoi

Feature Request: Adaptive per-namespace event throttling in Pilot to protect against config churn

Problem

In large multicluster mesh deployments, a single noisy namespace can destabilize the entire control plane. A buggy controller reconciling a DestinationRule in a loop, short-lived CronJobs churning endpoints, or a misconfigured operator flapping a ServiceEntry — any of these produce a sustained stream of config events that forces Pilot into continuous initPushContext() recomputations and xDS pushes to every connected proxy.

Proposed solution: Adaptive per-namespace event throttling with backoff

Add a pre-debounce throttling layer at DiscoveryServer.ConfigUpdate() that tracks event rates per namespace and applies exponential backoff delay to namespaces exceeding a configurable threshold. Well-behaved namespaces pass through with zero added latency.

Pawan-Bishnoi

/*
 * We keep two canvases to mimic remote user behaviour
 * Events from canvas_left should also reach canvas_right
 */

var canvas_left = new fabric.Canvas ('canvas1');
var canvas_right = new fabric.Canvas ('canvas2');

// is_down := keeps track if the mouse is down
// to distinguish mousemove and mousedrag

Pawan-Bishnoi

/*
 * Longest palindromic string
 * This is 0n^2 complexity
 * space complexity is also 0n^2
 * Although a solution with 0n^2 with constant space is also possible */

string longestPalindrome(char *A) {
    int **table;
    int n = A.length();
    int i, j, len;

Pawan-Bishnoi

/**
* Add an textarea, this is to be used as 'the editor'
* We will place it over some pointText that we want to edit
**/
var $anchor = $('body');
$anchor.append ('<textarea class="text-box" maxlength="50"' +
                ' style="position: absolute; color: black; display:none" type="text">' +
                '</textarea>');       // hidden initially

var editor = $anchor.find ('.text-box');