[jira] [Resolved] (KUDU-2134) Defer block transaction commit to the end of a tablet copy

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

     [ https://issues.apache.org/jira/browse/KUDU-2134?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hao Hao resolved KUDU-2134.
---------------------------
       Resolution: Fixed
    Fix Version/s: 1.6.0

> Defer block transaction commit to the end of a tablet copy
> ----------------------------------------------------------
>
>                 Key: KUDU-2134
>                 URL: https://issues.apache.org/jira/browse/KUDU-2134
>             Project: Kudu
>          Issue Type: Bug
>          Components: tserver
>    Affects Versions: 1.5.0
>            Reporter: Adar Dembo
>            Assignee: Hao Hao
>             Fix For: 1.6.0
>
>
> While looking at KUDU-2131, it occurred to me that we could solve the "batched fsyncs could lead to a tablet copy session timeout" problem entirely if we simply deferred the commit of the blocks until after we're done with the session. That would mean deferring it until after {{DownloadWALs}}. That's probably a good thing to do anyway:
> # If {{DownloadWALs}} fails there's no reason to pay the fsync price and commit all those blocks.
> # While {{DownloadWALs}} is running the kernel has more time to eagerly flush the blocks, so the fsyncs at the end could be cheaper.



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