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From "Stefania (JIRA)" <j...@apache.org>
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

    [ https://issues.apache.org/jira/browse/CASSANDRA-11053?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15179075#comment-15179075
] 

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:

{quote}

||2.1||2.2||2.2 win||3.0||3.5||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/11053-3.5]|[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/stef1927-11053-3.5-dtest/]|[dtest|http://cassci.datastax.com/view/Dev/view/stef1927/job/stef1927-11053-dtest/]|

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

{quote}

> 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
>              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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