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From "Stefania (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-11053) COPY FROM on large datasets: fix progress report and debug performance
Date Fri, 04 Mar 2016 01:09:40 GMT


Stefania commented on CASSANDRA-11053:

Thank you, CI results are clean.

This patch is ready for commit, merge information and patches available in the 7th comment
above and repeated here:


||2.1||2.2||2.2 win||3.0||3.5||trunk||

There are conflicts all the way up to 3.5, only patch to merge cleanly is 3.5 into trunk.


> COPY FROM on large datasets: fix progress report and debug performance
> ----------------------------------------------------------------------
>                 Key: CASSANDRA-11053
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Tools
>            Reporter: Stefania
>            Assignee: Stefania
>              Labels: doc-impacting
>             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
> h5. Description
> 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.
> h5. Doc-impacting changes to COPY FROM options
> * A new option was added: PREPAREDSTATEMENTS - it indicates if prepared statements should
be used; it defaults to true.
> * The default value of CHUNKSIZE changed from 1000 to 5000.
> * The default value of MINBATCHSIZE changed from 2 to 10.

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