[jira] [Updated] (KUDU-503) Regression: always sync-on-close for data blocks makes tablet creation too slow

["Todd Lipcon (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KUDU-503?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Todd Lipcon updated KUDU-503:
-----------------------------
    Labels: data-scalability  (was: )

> Regression: always sync-on-close for data blocks makes tablet creation too slow
> -------------------------------------------------------------------------------
>
>                 Key: KUDU-503
>                 URL: https://issues.apache.org/jira/browse/KUDU-503
>             Project: Kudu
>          Issue Type: Sub-task
>          Components: fs
>    Affects Versions: M4.5
>            Reporter: Jean-Daniel Cryans
>              Labels: data-scalability
>
> When this change (http://gerrit.sjc.cloudera.com:8080/#/c/4231/) was pushed a bunch of stuff got slower, for example: http://gerrit.sjc.cloudera.com:8080/#/c/4253/.
> Tablet creation also got a lot slower, we used to be able to create 700 tablets with num_replicas=3 but now we're always missing ~50 (because the master drops the calls on the floor, different issue).
> enable_data_block_fsync can be disabled to get the performance back.
> On a single node, tablet creation with the flag turned off takes ~100ms whereas with the default value it takes at least 700ms (saw it taking seconds).



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