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https://issues.apache.org/jira/browse/CASSANDRA-11053?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15173201#comment-15173201
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Stefania commented on CASSANDRA-11053:
--------------------------------------
Thank you for your latest comments and for introducing
{{deserializers.DesBytesTypeByteArray}}.
I've fixed the typo, removed {{LibevConnection}} (as it was already the
default as you pointed out) and added {{DesBytesTypeByteArray}} if available,
in [this
commit|https://github.com/stef1927/cassandra/commit/2d10a8dc7d369324ecfd5d2457c15cf716243d98].
I've saved the commit history on this [historical
branch|https://github.com/stef1927/cassandra/commits/11053-2.1-historical].
I've squashed and up-merged:
||2.1||2.2||2.2 win||3.0||trunk||
|[patch|https://github.com/stef1927/cassandra/commits/11053-2.1]|[patch|https://github.com/stef1927/cassandra/commits/11053-2.2]|
|[patch|https://github.com/stef1927/cassandra/commits/11053-3.0]|[patch|https://github.com/stef1927/cassandra/commits/11053]|
|[dtest|http://cassci.datastax.com/view/Dev/view/stef1927/job/stef1927-11053-2.1-dtest/]|[dtest|http://cassci.datastax.com/view/Dev/view/stef1927/job/stef1927-11053-2.2-dtest/]|[win
dtest|http://cassci.datastax.com/view/Dev/view/stef1927/job/stef1927-11053-2.2-windows-dtest_win32/]|[dtest|http://cassci.datastax.com/view/Dev/view/stef1927/job/stef1927-11053-3.0-dtest/]|[dtest|http://cassci.datastax.com/view/Dev/view/stef1927/job/stef1927-11053-dtest/]|
No patch merges cleanly, all up-merges have conflicts.
CI is still pending.
> COPY FROM on large datasets: fix progress report and debug performance
> ----------------------------------------------------------------------
>
> Key: CASSANDRA-11053
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11053
> Project: Cassandra
> Issue Type: Bug
> Components: Tools
> Reporter: Stefania
> Assignee: Stefania
> Fix For: 2.1.x, 2.2.x, 3.0.x, 3.x
>
> Attachments: copy_from_large_benchmark.txt,
> copy_from_large_benchmark_2.txt, parent_profile.txt, parent_profile_2.txt,
> worker_profiles.txt, worker_profiles_2.txt
>
>
> Running COPY from on a large dataset (20G divided in 20M records) revealed
> two issues:
> * The progress report is incorrect, it is very slow until almost the end of
> the test at which point it catches up extremely quickly.
> * The performance in rows per second is similar to running smaller tests with
> a smaller cluster locally (approx 35,000 rows per second). As a comparison,
> cassandra-stress manages 50,000 rows per second under the same set-up,
> therefore resulting 1.5 times faster.
> See attached file _copy_from_large_benchmark.txt_ for the benchmark details.
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