[jira] [Commented] (KUDU-3214) Parallelize DownloadWAL in tablet copy operations

["wangningito (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KUDU-3214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17232515#comment-17232515 ] 

wangningito commented on KUDU-3214:
-----------------------------------

As I mentioned in [gerrit|https://gerrit.cloudera.org/#/c/16274/2//COMMIT_MSG@9], wals seems harder than blocks when implementing.
Write this issue to let you know I'm doing it.

> Parallelize DownloadWAL in tablet copy operations
> -------------------------------------------------
>
>                 Key: KUDU-3214
>                 URL: https://issues.apache.org/jira/browse/KUDU-3214
>             Project: Kudu
>          Issue Type: New Feature
>          Components: consensus, tablet
>            Reporter: wangningito
>            Assignee: wangningito
>            Priority: Minor
>
> When downloading tablet data via tablet copy operation, it is necessary to download blocks data and wal data.
> In [KUDU-1728|https://issues.apache.org/jira/browse/KUDU-1728] the DownloadBlocks were parallelized. 
> However, to intuition, it may make senses to make DownloadWALs parallelized as well. It requires very strict performance tests and correctness guarantee to determine whether to have parallelized version DownloadWALs or not.



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