https://docs.datastax.com/en/cassandra/3.0/cassandra/operations/opsConfigureCompaction.html
As pe STCS: *This strategy triggers a minor compaction when there are a number of similar sized SSTables on disk as configured by the table subproperty, min_threshold.* In your case you have *min_threshold=4 and 3 Big sstable and one small sstable.* Either you can change min_threshold to three in your case or you can change compaction strategy for this table. Thanks!! On Mon, Oct 2, 2017 at 4:48 PM, Steinmaurer, Thomas < thomas.steinmau...@dynatrace.com> wrote: > Hello Justin, > > > > yes, but in real-world, hard to accomplish for high volume column families > >= 3-digit GB. Even with the default of 10 days grace period, this may get > a real challenge, to complete a full repair. J > > > > Possibly back again to the discussion that incremental repair has some > flaws, full repair (-full option) in 3.0+ (2.2+?) isn’t behaving the same > way as in 2.1 anymore, due to troubles when kicking off with –pr on several > nodes at once. > > > > Regards, > > Thomas > > > > *From:* Justin Cameron [mailto:jus...@instaclustr.com] > *Sent:* Montag, 02. Oktober 2017 08:32 > *To:* user@cassandra.apache.org > *Subject:* Re: Alter table gc_grace_seconds > > > > >> * You should not try on real clusters directly. > > >Why not? :) > > It's highly recommended that you complete a full repair before the GC > grace period expires, otherwise it's possible you could experience zombie > data (i.e. data that was previously deleted coming back to life) > > See http://thelastpickle.com/blog/2016/07/27/about-deletes- > and-tombstones.html for a good overview of the problem > > > > > > On Mon, 2 Oct 2017 at 16:51 Gábor Auth <auth.ga...@gmail.com> wrote: > > Hi, > > On Mon, Oct 2, 2017 at 5:55 AM Varun Barala <varunbaral...@gmail.com> > wrote: > > *select gc_grace_seconds from system_schema.tables where keyspace_name = > 'keyspace' and table_name = 'number_item;* > > > > cassandra@cqlsh:mat> DESCRIBE TABLE mat.number_item; > > > CREATE TABLE mat.number_item ( > nodeid uuid, > type text, > created timeuuid, > value float, > PRIMARY KEY (nodeid, type, created) > ) WITH CLUSTERING ORDER BY (type ASC, created ASC) > AND bloom_filter_fp_chance = 0.01 > AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'} > AND cdc = false > AND comment = '' > AND compaction = {'class': > 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy', > 'max_threshold': '32', 'min_threshold': '4'} > AND compression = {'chunk_length_in_kb': '64', 'class': ' > org.apache.cassandra.io.compress.LZ4Compressor'} > AND crc_check_chance = 1.0 > AND dclocal_read_repair_chance = 0.1 > AND default_time_to_live = 0 > AND gc_grace_seconds = 3600 > AND max_index_interval = 2048 > AND memtable_flush_period_in_ms = 0 > AND min_index_interval = 128 > AND read_repair_chance = 0.0 > AND speculative_retry = '99PERCENTILE'; > > cassandra@cqlsh:mat> select gc_grace_seconds from system_schema.tables > where keyspace_name = 'mat' and table_name = 'number_item'; > > *gc_grace_seconds* > ------------------ > *3600* > > (1 rows) > > > Bye, > Gábor Auth > > -- > > *Justin Cameron* > Senior Software Engineer > > > > [image: Image removed by sender.] <https://www.instaclustr.com/> > > > This email has been sent on behalf of Instaclustr Pty. Limited (Australia) > and Instaclustr Inc (USA). > > This email and any attachments may contain confidential and legally > privileged information. If you are not the intended recipient, do not copy > or disclose its content, but please reply to this email immediately and > highlight the error to the sender and then immediately delete the message. > The contents of this e-mail are intended for the named addressee only. It > contains information that may be confidential. Unless you are the named > addressee or an authorized designee, you may not copy or use it, or > disclose it to anyone else. If you received it in error please notify us > immediately and then destroy it. Dynatrace Austria GmbH (registration > number FN 91482h) is a company registered in Linz whose registered office > is at 4040 Linz, Austria, Freistädterstraße 313 > <https://maps.google.com/?q=4040+Linz,+Austria,+Freist%C3%A4dterstra%C3%9Fe+313&entry=gmail&source=g> >
