Thank you! It should be "update column family ScheduleInfoCF with gc_grace = 3600;" Faint.
----- 原始邮件 ----- 发件人: "杨辉强" <huiqiangy...@yunrang.com> 收件人: user@cassandra.apache.org 发送时间: 星期二, 2013年 7 月 16日 下午 6:15:12 主题: Re: Deletion use more space. Hi, I use the follow cmd to update gc_grace_seconds. It reports error! Why? [default@WebSearch] update column family ScheduleInfoCF with gc_grace_seconds = 3600; java.lang.IllegalArgumentException: No enum const class org.apache.cassandra.cli.CliClient$ColumnFamilyArgument.GC_GRACE_SECONDS ----- 原始邮件 ----- 发件人: "Michał Michalski" <mich...@opera.com> 收件人: user@cassandra.apache.org 发送时间: 星期二, 2013年 7 月 16日 下午 5:51:49 主题: Re: Deletion use more space. Deletion is not really "removing" data, but it's adding tombstones (markers) of deletion. They'll be later merged with existing data during compaction and - in the end (see: gc_grace_seconds) - removed, but by this time they'll take some space. http://wiki.apache.org/cassandra/DistributedDeletes M. W dniu 16.07.2013 11:46, 杨辉强 pisze: > Hi, all: > I use cassandra 1.2.4 and I have 4 nodes ring and use byte order > partitioner. > I had inserted about 200G data in the ring previous days. > > Today I write a program to scan the ring and then at the same time delete > the items that are scanned. > To my surprise, the cassandra cost more disk usage. > > Anybody can tell me why? Thanks. >
