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From 曹志富 <>
Subject SStables can't compat automaticly
Date Mon, 26 Jan 2015 03:34:00 GMT
Hi everybody:

I have 18 nodes using cassandra2.1.2.Every node has 4 core, 32 GB RAM, 2T
hard disk,OS is CentOS release 6.2 (Final).

I have follow the <Recommended production settings> to config my
system.such as disable SWAP,unlimited mem lock...

My heap size is:


I use STCS,other config using default,using Datastax Java Driver 2.1.2.
BatchStatment 100key commit per time.

When I run my cluster and insert data from kafka (10000 keys/s) after 2
days,every node can't compact  some there too many sstables.

I try to use major compact to compact the sstables , it cost a long long
time .Also the new sstables can't compat automatic.

I trace the log , the CMS GC too often,almost 30 minute onetime.

Could someone help me to solve this problem.


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