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Memory Leak on readStream

See original GitHub issue

Lib version 3.3.1

Here is example

const {
} = require("@eventstore/db-client")

var heapdump = require('heapdump')

const client = new EventStoreDBClient(
    endpoint: "localhost:2113",
    insecure: true,

(async () => {
  const streamName = "es_supported_clients"
  const event = jsonEvent({
    type: "grpc-client",
    data: {
      languages: ["typescript", "javascript"],
      runtime: "NodeJS",
  await client.appendToStream(streamName, [event])

  for (let index = 0; index < 10000; index++) {
    const events = client.readStream(streamName, {
      fromRevision: START,
      direction: FORWARDS,
      maxCount: 10,

    // if remove the loop. memory leak even bigger
    for await (const event of events) {
      // convert to mb
      Math.round((process.memoryUsage().heapUsed / 1024 / 1024) * 100) / 100
  heapdump.writeSnapshot(function (err, filename) {
    console.log('dump written to', filename)

Memory Leak | no loop Memory Leak

Issue Analytics

  • State:closed
  • Created a year ago
  • Comments:9 (4 by maintainers)

github_iconTop GitHub Comments

George-Paynecommented, Aug 18, 2022

Thanks @matchish, good find.

The fix / bit of explanation is here: #310

Read more comments on GitHub >

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