I am having an issue where Cassandra doesn't seem to be able to distinguish
between 2 different UUIDs if based on the same exact time, and sorting by
TimeUUID.
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Some of my config:
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<Keyspaces>
<Keyspace Name="OD">
<KeysCachedFraction>0.01</KeysCachedFraction>
<ColumnFamily CompareWith="TimeUUIDType" Name="Events"/>
</Keyspace>
</Keyspaces>
...
<Partitioner>org.apache.cassandra.dht.OrderPreservingPartitioner</Partitioner>
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Ruby sample:
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require 'rubygems'
require 'cassandra'
logs = [{:DateTime=>'1257195334', :Text=>"something happened"},
{:DateTime=>'1257195334', :Text=>"something happened again at the same
time"},
{:DateTime=>'1257195334', :Text=>"something happened one second later"}]
client = Cassandra.new("OD")
logs.each do |log_line|
event_id = UUID.new(Time.at(log_line['DateTime'].to_i))
puts event_id.to_guid
if client.get(:Events, "processed", event_id) != nil
puts "duplicate: " + event_id.to_guid + " " + log_line['DateTime'].to_s
end
client.insert(:Events, "processed", event_id=>"#{log_line['Text']}")
end
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Outputs:
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1257195334
1077e700-c7f2-11de-86d5-f5bcc793a028
1257195334
1077e700-c7f2-11de-982e-6fad363d5f29
duplicate: 1077e700-c7f2-11de-982e-6fad363d5f29 1257195334
1257195335
11107d80-c7f2-11de-9b6f-4c8aee849eef
Cassandra doesn't seem to be able to distinguish between 2 different UUIDs if
based on the same exact time, and sorting by TimeUUID.
What am I missing???
--
John Alessi
SocketLabs, Inc.
484-418-1282
