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Posted to commits@cassandra.apache.org by "C. Scott Andreas (JIRA)" <ji...@apache.org> on 2018/11/19 01:37:00 UTC
[jira] [Updated] (CASSANDRA-13835) Thrift get_slice responds slower
on Cassandra 3
[ https://issues.apache.org/jira/browse/CASSANDRA-13835?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
C. Scott Andreas updated CASSANDRA-13835:
-----------------------------------------
Component/s: Core
> Thrift get_slice responds slower on Cassandra 3
> -----------------------------------------------
>
> Key: CASSANDRA-13835
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13835
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: Windows
> Reporter: Pawel Szlendak
> Priority: Major
> Attachments: 0001-Fix-performance-when-running-on-Windows.patch, attack.py, cassandra120_get_slice_reply_time.png, cassandra310_get_slice_reply_time.png
>
>
> I have recently upgraded from Cassandra 1.2.18 to Cassandra 3.10 and was surprised to notice performance degradation of my server application.
> I dug down through my application stack only to find out that the cause of the performance issue was slower response time of Cassandra 3.10 get_slice as compared to Cassandra 1.2.18 (almost x3 times slower on average).
> I am attaching a python script (attack.py) here that can be used to reproduce this issue on a Windows platform. The script uses the pycassa python library that can easily be installed using pip.
> REPRODUCTION STEPS:
> 1. Install Cassandra 1.2.18 from https://archive.apache.org/dist/cassandra/1.2.18/apache-cassandra-1.2.18-bin.tar.gz
> 2. Run Cassandra 1.2.18 from cmd console using cassandra.bat
> 3. Create a test keyspace and an empty CF using attack.py script
>
> {noformat}
> python attack.py create
> {noformat}
> 4. Run some get_slice queries to an empty CF and note down the average response time (in seconds)
>
> {noformat}
> python attack.py
> {noformat}
> get_slice count: 788
> get_slice total response time: 0.31299996376
> *get_slice average response time: 0.000397208075838*
> 5. Stop Cassandra 1.2.18 and install Cassandra 3.10 from https://archive.apache.org/dist/cassandra/3.10/apache-cassandra-3.10-bin.tar.gz
> 6. Tweak cassandra.yaml to run thrift service (start_rpc=true) and run Cassandra from an elevated cmd console using cassandra.bat
> 7. Create a test keyspace and an empty CF using attack.py script
>
> {noformat}
> python attack.py create
> {noformat}
> 8. Run some get_slice queries to an empty CF using attack.py and note down the average response time (in seconds)
> {noformat}
> python attack.py
> {noformat}
> get_slice count: 788
> get_slice total response time: 1.16499996185
> *get_slice average response time: 0.00147842634753*
> 9. Compare the average response times
> EXPECTED:
> get_slice response time of Cassandra 3.10 is not worse than on Cassandra 1.2.18
> ACTUAL:
> get_slice response time of Cassandra 3.10 is x3 worse than that of Cassandra 1.2.18
> REMARKS:
> - this seems to happen only on Windows platform (tested on Windows 10 and Windows Server 2008 R2)
> - running the very same procedure on Linux (Ubuntu) renders roughly the same response times
> - I sniffed the traffic to/from Cassandra 1.2.18 and Cassandra 3.10 and it can be seen that Cassandra 3.10 responds slower (Wireshark dumps attached)
> - when attacking the server with concurrent get_slice queries I can see lower CPU usage for Cassandra 3.10 that for Cassandra 1.2.18
> - get_slice in attack.py queries the column family for non-exisitng key (the column familiy is empty)
> I am willing to work on this on my own if you guys give me some tips on where to look for. I am also aware that this might be more Windows/Java related, nevertheless, any help from your side would be much appreciated.
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