Incremental backups are only triggered when new data is written to disk, such as a memtable being flushed or data being streamed in from a repair or move.  Compaction does not create any new data, so there's no need to back up the result.

On Mon, Sep 3, 2012 at 8:45 AM, <mdione.ext@orange.com> wrote:

  Today I configured incremental backups in a test node which already has some data on it,
and I found that backups are not created for STTables created by a compact:

mddione@life:~/src/works/orange/Cassandra$ sudo find /var/lib/cassandra/data/one_cf
/var/lib/cassandra/data/one_cf
/var/lib/cassandra/data/one_cf/cf_1
/var/lib/cassandra/data/one_cf/cf_1/one_cf-cf_1-hd-4-Statistics.db
/var/lib/cassandra/data/one_cf/cf_1/one_cf-cf_1-hd-4-Data.db
/var/lib/cassandra/data/one_cf/cf_1/one_cf-cf_1-hd-5-Index.db
/var/lib/cassandra/data/one_cf/cf_1/one_cf-cf_1-hd-4-Index.db
/var/lib/cassandra/data/one_cf/cf_1/one_cf-cf_1-hd-5-Filter.db
/var/lib/cassandra/data/one_cf/cf_1/one_cf-cf_1-hd-5-Data.db
/var/lib/cassandra/data/one_cf/cf_1/one_cf-cf_1-hd-4-CompressionInfo.db
/var/lib/cassandra/data/one_cf/cf_1/one_cf-cf_1-hd-5-CompressionInfo.db
/var/lib/cassandra/data/one_cf/cf_1/backups
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-1-Index.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-3-Data.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-2-CompressionInfo.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-3-Filter.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-5-Index.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-1-Data.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-2-Index.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-2-Filter.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-5-Filter.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-1-Statistics.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-2-Data.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-3-Statistics.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-5-Data.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-5-CompressionInfo.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-2-Statistics.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-1-CompressionInfo.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-5-Statistics.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-1-Filter.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-3-CompressionInfo.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-3-Index.db
/var/lib/cassandra/data/one_cf/cf_1/one_cf-cf_1-hd-4-Filter.db
/var/lib/cassandra/data/one_cf/cf_1/one_cf-cf_1-hd-5-Statistics.db

mddione@life:~/src/works/orange/Cassandra$ nodetool compact

mddione@life:~/src/works/orange/Cassandra$ sudo find /var/lib/cassandra/data/one_cf
/var/lib/cassandra/data/one_cf
/var/lib/cassandra/data/one_cf/cf_1
/var/lib/cassandra/data/one_cf/cf_1/one_cf-cf_1-hd-6-Data.db
/var/lib/cassandra/data/one_cf/cf_1/one_cf-cf_1-hd-6-Statistics.db
/var/lib/cassandra/data/one_cf/cf_1/one_cf-cf_1-hd-6-Index.db
/var/lib/cassandra/data/one_cf/cf_1/one_cf-cf_1-hd-6-Filter.db
/var/lib/cassandra/data/one_cf/cf_1/one_cf-cf_1-hd-6-CompressionInfo.db
/var/lib/cassandra/data/one_cf/cf_1/backups
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-1-Index.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-3-Data.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-2-CompressionInfo.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-3-Filter.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-5-Index.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-1-Data.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-2-Index.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-2-Filter.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-5-Filter.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-1-Statistics.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-2-Data.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-3-Statistics.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-5-Data.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-5-CompressionInfo.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-2-Statistics.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-1-CompressionInfo.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-5-Statistics.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-1-Filter.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-3-CompressionInfo.db
/var/lib/cassandra/data/one_cf/cf_1/backups/one_cf-cf_1-hd-3-Index.db

as you can see, neither SSTables 4 or 6 have backups; both were created by compactions.

--
Marcos Dione
SysAdmin
Astek Sud-Est
pour FT/TGPF/OPF/PORTAIL/DOP/HEBEX @ Marco Polo
04 97 12 62 45 - mdione.ext@orange.com



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