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  1. Apache NiFi
  2. NIFI-3568

Default thread pool that is created for cluster request replication is not sufficient

    Details

    • Type: Bug
    • Status: Patch Available
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: Core Framework
    • Labels:
      None

      Description

      I have a cluster of 3 nodes. When the nodes are under heavy load, I notice that API requests sometimes complete in 10's to 100's of milliseconds but sometimes take several seconds (8+ seconds, at times).

      After doing some investigation, it appears to be due to the fact that the default thread pool size of 10 is not sufficient anymore. In the 0.x baseline, it was okay because each time that a user clicks "Refresh" on the UI it was a single request. With the 1.x baseline, this results in 4 separate requests fired off simultaneously due to the multi-tenancy features added. As a result, these 4 requests need to be replicated to 3 nodes each, which is 12 web requests that have to occur. So even a simple Refresh on the UI cannot be fully done in parallel.

      Changing my pool size from 10 to 30 resulted in far more consistent response times. Unfortunately, scaling the thread pool up to a large number of threads can have its cons, too. So will create a "cached" thread pool and expose properties for the "core pool size" and the "max pool size".

        Issue Links

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          githubbot ASF GitHub Bot added a comment -

          GitHub user markap14 opened a pull request:

          https://github.com/apache/nifi/pull/1577

          NIFI-3568: Use a cached thread pool in order to allow ThreadPoolReque…

          …stReplicator to scale up the number of threads to some configurable max

          Thank you for submitting a contribution to Apache NiFi.

          In order to streamline the review of the contribution we ask you
          to ensure the following steps have been taken:

              1. For all changes:
          • [ ] Is there a JIRA ticket associated with this PR? Is it referenced
            in the commit message?
          • [ ] Does your PR title start with NIFI-XXXX where XXXX is the JIRA number you are trying to resolve? Pay particular attention to the hyphen "-" character.
          • [ ] Has your PR been rebased against the latest commit within the target branch (typically master)?
          • [ ] Is your initial contribution a single, squashed commit?
              1. For code changes:
          • [ ] Have you ensured that the full suite of tests is executed via mvn -Pcontrib-check clean install at the root nifi folder?
          • [ ] Have you written or updated unit tests to verify your changes?
          • [ ] If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under [ASF 2.0](http://www.apache.org/legal/resolved.html#category-a)?
          • [ ] If applicable, have you updated the LICENSE file, including the main LICENSE file under nifi-assembly?
          • [ ] If applicable, have you updated the NOTICE file, including the main NOTICE file found under nifi-assembly?
          • [ ] If adding new Properties, have you added .displayName in addition to .name (programmatic access) for each of the new properties?
              1. For documentation related changes:
          • [ ] Have you ensured that format looks appropriate for the output in which it is rendered?
              1. Note:
                Please ensure that once the PR is submitted, you check travis-ci for build issues and submit an update to your PR as soon as possible.

          You can merge this pull request into a Git repository by running:

          $ git pull https://github.com/markap14/nifi NIFI-3568

          Alternatively you can review and apply these changes as the patch at:

          https://github.com/apache/nifi/pull/1577.patch

          To close this pull request, make a commit to your master/trunk branch
          with (at least) the following in the commit message:

          This closes #1577


          commit 864c9db7ee333d220791723f395d8a9eba42a82e
          Author: Mark Payne <markap14@hotmail.com>
          Date: 2017-03-08T15:04:53Z

          NIFI-3568: Use a cached thread pool in order to allow ThreadPoolRequestReplicator to scale up the number of threads to some configurable max


          Show
          githubbot ASF GitHub Bot added a comment - GitHub user markap14 opened a pull request: https://github.com/apache/nifi/pull/1577 NIFI-3568 : Use a cached thread pool in order to allow ThreadPoolReque… …stReplicator to scale up the number of threads to some configurable max Thank you for submitting a contribution to Apache NiFi. In order to streamline the review of the contribution we ask you to ensure the following steps have been taken: For all changes: [ ] Is there a JIRA ticket associated with this PR? Is it referenced in the commit message? [ ] Does your PR title start with NIFI-XXXX where XXXX is the JIRA number you are trying to resolve? Pay particular attention to the hyphen "-" character. [ ] Has your PR been rebased against the latest commit within the target branch (typically master)? [ ] Is your initial contribution a single, squashed commit? For code changes: [ ] Have you ensured that the full suite of tests is executed via mvn -Pcontrib-check clean install at the root nifi folder? [ ] Have you written or updated unit tests to verify your changes? [ ] If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under [ASF 2.0] ( http://www.apache.org/legal/resolved.html#category-a)? [ ] If applicable, have you updated the LICENSE file, including the main LICENSE file under nifi-assembly? [ ] If applicable, have you updated the NOTICE file, including the main NOTICE file found under nifi-assembly? [ ] If adding new Properties, have you added .displayName in addition to .name (programmatic access) for each of the new properties? For documentation related changes: [ ] Have you ensured that format looks appropriate for the output in which it is rendered? Note: Please ensure that once the PR is submitted, you check travis-ci for build issues and submit an update to your PR as soon as possible. You can merge this pull request into a Git repository by running: $ git pull https://github.com/markap14/nifi NIFI-3568 Alternatively you can review and apply these changes as the patch at: https://github.com/apache/nifi/pull/1577.patch To close this pull request, make a commit to your master/trunk branch with (at least) the following in the commit message: This closes #1577 commit 864c9db7ee333d220791723f395d8a9eba42a82e Author: Mark Payne <markap14@hotmail.com> Date: 2017-03-08T15:04:53Z NIFI-3568 : Use a cached thread pool in order to allow ThreadPoolRequestReplicator to scale up the number of threads to some configurable max

            People

            • Assignee:
              markap14 Mark Payne
              Reporter:
              markap14 Mark Payne
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              Dates

              • Created:
                Updated:

                Development