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Posted to issues@ozone.apache.org by "Arpit Agarwal (Jira)" <ji...@apache.org> on 2021/04/19 21:10:00 UTC
[jira] [Commented] (HDDS-4687) Disable compression for
closed-container replication
[ https://issues.apache.org/jira/browse/HDDS-4687?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17325316#comment-17325316 ]
Arpit Agarwal commented on HDDS-4687:
-------------------------------------
Can this fix be committed?
> Disable compression for closed-container replication
> ----------------------------------------------------
>
> Key: HDDS-4687
> URL: https://issues.apache.org/jira/browse/HDDS-4687
> Project: Apache Ozone
> Issue Type: Improvement
> Reporter: Marton Elek
> Assignee: Marton Elek
> Priority: Critical
> Attachments: HDDS-4687.patch
>
>
> During the measurement of closed container replication I found that the biggest bottleneck is the read side. 5 Gb container is replicated under ~3 minutes but ~2:30 was the downloading part.
> Closed containers are replicated via GRPC. The source side creates an OutputStream on-the-fly (OnDemandContainerReplicationSource.java) and stream all the container content as a "tar.gz" archive to the client.
> It turned out that the compression (the .gz part) is quite expensive:
> I created a CLI tool to export containers to tar files (same logic as the replication but without streaming via GRPC, just saving to a file).
> I have seen the 2:30 time to create the archive:
> {code}
> 2021-01-13 05:51:25,302 [main] INFO debug.ExportContainer: Preparation is done
> 2021-01-13 05:53:53,472 [main] INFO debug.ExportContainer: Container is exported to /tmp/container-3.tar.gz
> {code}
> But when I removed the compression in TarContainerPacker.java, the speed was significant better (25 sec instead of the 150 sec)
> {code}
> 2021-01-13 06:11:46,254 [main] INFO debug.ExportContainer: Preparation is done
> 2021-01-13 06:12:11,512 [main] INFO debug.ExportContainer: Container is exported to /tmp/container-3.tar
> {code}
> As a result I suggest turning off the compression for closed container replication.
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