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From Michael Wall <mjw...@gmail.com>
Subject Re: Run Accumulo and Hadoop services under systemd
Date Sun, 15 Dec 2019 16:16:56 GMT
Hi Aishwarya,

I didn't get any attachments on this.



On Fri, Dec 13, 2019 at 5:46 PM Aishwarya Thangappa
<Aishwarya.Thangappa@microsoft.com.invalid> wrote:

> Hello everyone,
> I have not subscribed to the dev mailing list earlier and missed on some
> of your questions. I will address them here.
> @Christopher
> Most of the changes except the actual installation of the systemd units
> could possibly go into Accumulo. These would be the systemd units for
> various accumulo services, modification to cluster-wide scripts in accumulo
> to use systemd instead of directly starting/stopping the processes. We
> would be happy to accommodate/answer any suggestions or follow-up questions
> you may have.
> Attached the accumulo_cluster and accumulo_service scripts with systemd
> changes.
> @Keith Turner
> Once we determine where the different pieces should land, I can post PRs
> accordingly. In our current setup, in muchos.properties file I have added a
> `use_systemd` flag which when set to true, will overwrite the accumulo
> cluster-wide scripts in the nodes with the attached ones. These files
> currently reside at ansible/roles/accumulo/files. If we determine that
> these scripts and the systemd unit files will instead go to Accumulo
> project, I will have to make changes accordingly.
> @Michael Wall
> Systemd units internally call the same scripts that accumulo_cluster
> commands currently use. The change is that accumulo_cluster commands would
> call systemd start/stop which inturn would call accumulo_service commands.
> Attached a sample systemd_unit template. Can you please elaborate if this
> is still an issue?
> ------------------------------
> *From:* Aishwarya Thangappa
> *Sent:* Thursday, December 12, 2019 11:25 AM
> *To:* dev@fluo.apache.org <dev@fluo.apache.org>
> *Cc:* Arvind Shyamsundar <arvindsh@microsoft.com>; Billie Rinaldi <
> Billie.Rinaldi@microsoft.com>
> *Subject:* Run Accumulo and Hadoop services under systemd
> Hi everyone,
> While using fluo-muchos to deploy an Accumulo cluster, we recognized the
> need for various Accumulo and Hadoop services to be run under a service
> manager like systemd which will ensure that all these services are brought
> up correctly in the event of VM / OS reboots / cold starts. We have made
> the required changes for this and would like to contribute it back to the
> community if there is any interest around it.
> Summarizing what we have done:
>    - Crafted separate systemd unit files for Accumulo (master, monitor,
>    gc, traser, tserver), Hadoop (journalnode, namenode, datanode,
>    resourcemanager, nodemanager, zkfc) and Zookeeper services.
>    - All of these unit files will be copied to the respective nodes'
>    /etc/systemd/system directory; the services will then be started and
>    enabled by ansible systemd module.
>    - In case of num_tservers > 1, multiple tserver systemd units will be
>    copied to the node and each will be independently managed.
>    - Also made necessary changes to the existing cluster-wide scripts
>    including accumulo_cluster, accumulo_service, start_dfs, start_yarn etc.,
>    to have them work seamlessly with sytemd.
> Is there an appetite to look at the details? If so, we can post a PR or if
> there are any feedbacks and other considerations, please let us know and we
> can discuss them.
> Thanks,
> Aishwarya

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