I am currently noticing very very slow compactions on my cluster and wondering if there is any way to speed things up.
Right now I have this compaction currently running : 60c1cfc0-8da7-11e9-bc08-3546c703a280 Compaction keyspace1 > table1 8.77 GB 1.71 TB bytes 0.50% The speed is abysmal, it only progresses by "0.24%" every _hour_. At this rate it is going to take weeks... When I look at the cpu load and disk load I see : Never more than 10MB/s read and write combined. Never more than 6 load average, most of the cpu time is spent idle. ## Hardware configuration : The node is a n1-highmem-8 (8 vCPUs, 52 GB memory) instance on google cloud engine. The disk performances should be around : 15,000.00 random IOPS (read write) 800MB/s Read 400 MB/s Write ## Cassandra configuration : 4 concurrent_compactors Current compaction throughput: 150 MB/s Concurrent reads/write are both set to 128. I have also temporarily stopped every repair operations. Any ideas about how I can speed this up ? Regards, Leo
