[jira] [Commented] (KUDU-2131) Tablet copy session may expire before completion for large tablet

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

    [ https://issues.apache.org/jira/browse/KUDU-2131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16151536#comment-16151536 ] 

Adar Dembo commented on KUDU-2131:
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[~hahao] can you elaborate? Is the issue that DownloadBlocks can take >3m (default idle timeout) to commit the new blocks such that the session is terminated before DownloadWALs? How large of a tablet is necessary to trigger this effect?


> Tablet copy session may expire before completion for large tablet
> -----------------------------------------------------------------
>
>                 Key: KUDU-2131
>                 URL: https://issues.apache.org/jira/browse/KUDU-2131
>             Project: Kudu
>          Issue Type: Bug
>            Reporter: Hao Hao
>            Priority: Blocker
>             Fix For: 1.5.0
>
>
> KUDU-1726 introduced an optimization to do a bulk sync-to-disk once the tablet copy operation is complete. However, when tested in a large cluster, I found disk synchronization in batches can result in the tablet session expires before the synchronization complete. There is a flag '--tablet_copy_idle_timeout_ms' to control the amount of time without activity before a tablet copy session expires, but it is tagged as hidden(not user-facing).



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