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Re: Re: how to upgrade my cassadra from SizeTieredCompaction to LeveledCompactiom

On Mon, May 14, 2012 at 10:34 AM, zhangcheng wrote: > thanks, Edward. > > In my test, when I changed to leveled strategy, the compaction can't > finish for the reason that we have 700G new data every day! > > what can I do if I want to save the comapction space? > > > For so big dataset, you may

Re: Re: how to upgrade my cassadra from SizeTieredCompaction to LeveledCompactiom

On Mon, May 14, 2012 at 10:34 AM, zhangcheng wrote: > thanks, Edward. > > In my test, when I changed to leveled strategy, the compaction can't > finish for the reason that we have 700G new data every day! > > what can I do if I want to save the comapction space? > For so big dataset, you may tri

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why need compaction

There is some data out of date, so we need compaction to delete it. When read, we should merge all the version to get full data, I think this will slow down the read performace. and at most time, we can avoid this. Then we can make compaction easy. Am I right? Thanks. zhangcheng

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Re: Re: how to upgrade my cassadra from SizeTieredCompaction to LeveledCompactiom

thanks, Edward. In my test, when I changed to leveled strategy, the compaction can't finish for the reason that we have 700G new data every day! what can I do if I want to save the comapction space? zhangcheng From: Edward Capriolo Date: 2012-05-14 10:14 To: dev; zhangcheng Subject: Re: how

Re: how to upgrade my cassadra from SizeTieredCompaction to LeveledCompactiom

As soon as you use the CLI to change the compaction strategy for a column family Cassandra will consider all SSTables level 0 and being level-ing them. With that much data, think hard before making the change. You have to understand how level ed will work with your workload. On Sun, May 13, 2012

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