Package org.apache.cassandra.tracing

Class TraceKeyspace

  • public final class TraceKeyspace
extends java.lang.Object

    • Field Summary

      Fields 
      Modifier and Type Field Description
      static java.lang.String EVENTS  
      static long GENERATION
      Generation is used as a timestamp for automatic table creation on startup.
      static java.lang.String SESSIONS  
      static java.util.Set<java.lang.String> TABLE_NAMES  

    • Field Detail

      • GENERATION

        public static final long GENERATION
        Generation is used as a timestamp for automatic table creation on startup. If you make any changes to the tables below, make sure to increment the generation and document your change here. gen 1577836800000000: (3.0) maps to Jan 1 2020; an arbitrary cut-off date by which we assume no nodes older than 2.0.2 will ever start; see the note below for why this is necessary; actual change in 3.0: removed default ttl, reduced bloom filter fp chance from 0.1 to 0.01. gen 1577836800000001: (pre-)adds coordinator_port column to sessions and source_port column to events in 3.0, 3.11, 4.0 gen 1577836800000002: compression chunk length reduced to 16KiB, memtable_flush_period_in_ms now unset on all tables in 4.0 * Until CASSANDRA-6016 (Oct 13, 2.0.2) and in all of 1.2, we used to create system_traces keyspace and tables in the same way that we created the purely local 'system' keyspace - using current time on node bounce (+1). For new definitions to take, we need to bump the generation further than that.
        See Also:
        Constant Field Values

      • TABLE_NAMES

        public static final java.util.Set<java.lang.String> TABLE_NAMES