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https://issues.apache.org/jira/browse/CASSANDRA-6977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14063873#comment-14063873
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Michael Nelson commented on CASSANDRA-6977:
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Are we going to continue testing this? We have a large customer waiting to add
new keyspaces i.e. customers to their application service.
Thanks!
> attempting to create 10K column families fails with 100 node cluster
> --------------------------------------------------------------------
>
> Key: CASSANDRA-6977
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6977
> Project: Cassandra
> Issue Type: Bug
> Environment: 100 nodes, Ubuntu 12.04.3 LTS, AWS m1.large instances
> Reporter: Daniel Meyer
> Attachments: 100_nodes_all_data.png, all_data_5_nodes.png,
> keyspace_create.py, logs.tar, tpstats.txt, visualvm_tracer_data.csv
>
>
> During this test we are attempting to create a total of 1K keyspaces with 10
> column families each to bring the total column families to 10K. With a 5
> node cluster this operation can be completed; however, it fails with 100
> nodes. Please see the two charts. For the 5 node case the time required to
> create each keyspace and subsequent 10 column families increases linearly
> until the number of keyspaces is 1K. For a 100 node cluster there is a
> sudden increase in latency between 450 keyspaces and 550 keyspaces. The test
> ends when the test script times out. After the test script times out it is
> impossible to reconnect to the cluster with the datastax python driver
> because it cannot connect to the host:
> cassandra.cluster.NoHostAvailable: ('Unable to connect to any servers',
> {'10.199.5.98': OperationTimedOut()}
> It was found that running the following stress command does work from the
> same machine the test script runs on.
> cassandra-stress -d 10.199.5.98 -l 2 -e QUORUM -L3 -b -o INSERT
> It should be noted that this test was initially done with DSE 4.0 and c*
> version 2.0.5.24 and in that case it was not possible to run stress against
> the cluster even locally on a node due to not finding the host.
> Attached are system logs from one of the nodes, charts showing schema
> creation latency for 5 and 100 node clusters and virtualvm tracer data for
> cpu, memory, num_threads and gc runs, tpstat output and the test script.
> The test script was on an m1.large aws instance outside of the cluster under
> test.
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