I'm looking to use Cassandra to store log messages from various
systems. A log message only has a message (UTF8Type) and a data/time.
My thought is to create a column family for each system. The row key
will be a TimeUUIDType. Each row will have 7 columns: year, month,
day, hour, minute, second, and message. I then have indexes setup for
each of the date/time columns.
I was hoping this would allow me to answer queries like: "What are all
the log messages that were generated between X & Y?" The problem is
that I can ONLY use the equals operator on these column values. For
example, I cannot issuing: get system_x where month > 1; gives me this
error: "No indexed columns present in index clause with operator EQ."
The equals operator works as expected though: get system_x where month
= 1;
What schema would allow me to get date ranges?
Thanks in advance...
Bill-
* ColumnFamily description *
ColumnFamily: system_x_msg
Columns sorted by: org.apache.cassandra.db.marshal.UTF8Type
Row cache size / save period: 0.0/0
Key cache size / save period: 200000.0/3600
Memtable thresholds: 1.1671875/249/60
GC grace seconds: 864000
Compaction min/max thresholds: 4/32
Read repair chance: 1.0
Built indexes: [proj_1_msg.646179, proj_1_msg.686f7572,
proj_1_msg.6d696e757465, proj_1_msg.6d6f6e7468,
proj_1_msg.7365636f6e64, proj_1_msg.79656172]
Column Metadata:
Column Name: year (year)
Validation Class: org.apache.cassandra.db.marshal.IntegerType
Index Type: KEYS
Column Name: month (month)
Validation Class: org.apache.cassandra.db.marshal.IntegerType
Index Type: KEYS
Column Name: second (second)
Validation Class: org.apache.cassandra.db.marshal.IntegerType
Index Type: KEYS
Column Name: minute (minute)
Validation Class: org.apache.cassandra.db.marshal.IntegerType
Index Type: KEYS
Column Name: hour (hour)
Validation Class: org.apache.cassandra.db.marshal.IntegerType
Index Type: KEYS
Column Name: day (day)
Validation Class: org.apache.cassandra.db.marshal.IntegerType
Index Type: KEYS
