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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