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From qf zhou <zhouqf2...@gmail.com>
Subject How to do cassandra routine maintenance
Date Sat, 02 Sep 2017 02:17:14 GMT
I am using the cluster with 3 cassandra  nodes, the cluster version is 3.0.9. Each day about
200~300 million records are inserted into the cluster.
As time goes by,  more and more data occupied more and more disk space. Currently,    the
data distribution  on each node is  as  the following:

UN  172.20.5.4  2.5 TiB    256          66.3%             c5271e74-19a1-4cee-98d7-dc169cf87e95
 rack1
UN  172.20.5.2  1.73 TiB   256          67.0%             c623bbc0-9839-4d2d-8ff3-db7115719d59
 rack1
UN  172.20.5.3  1.86 TiB   256          66.7%             c555e44c-9590-4f45-aea4-f5eca68180b2
 rack1 

There is only one datacenter.  

The compaciton strategy is here:
    compaction = {'class': 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy',
'max_threshold': '32', 'min_threshold': '12', 'tombstone_threshold': '0.1', 'unchecked_tombstone_compaction':
'true'}
    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 = 8640000
    AND gc_grace_seconds = 432000

I really want to know  about how to do cassandra routine maintenance ?

I found the data seems to grow faster  and  the disk is in heavy load. Sometimes I found the
data inconsistency: two different results appear with the same query.

So what I shoud I do to keep the cluster healthy,  how to maintain the cluster?

I hope  some help  very much!  Thanks a lot ! 



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