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https://issues.apache.org/jira/browse/KUDU-1726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15981964#comment-15981964
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Todd Lipcon commented on KUDU-1726:
-----------------------------------
As a quick test, I used 'set_flag never_sync true' on a bunch of tablet servers
in a cluster doing tablet copies. This increased the tablet copy throughput on
the cluster from around ~400M/sec to around ~700M/sec.
> Avoid fsync-per-block in tablet copy
> ------------------------------------
>
> Key: KUDU-1726
> URL: https://issues.apache.org/jira/browse/KUDU-1726
> Project: Kudu
> Issue Type: Bug
> Components: tablet
> Reporter: Mike Percy
>
> We should be able to do a full tablet copy, keeping in mind which blocks and
> WAL segments have changed, and then do a bulk sync-to-disk once the full
> operation is complete. This would allow the kernel to schedule the IO at its
> leisure until durability is actually required.
> This will likely require changes from the BlockManger API and LogBlockManager
> implementation to support.
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