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

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

Adar Dembo created KUDU-2134:
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             Summary: 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


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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