On 12/16/2011 10:13 PM, Brandon Williams wrote:
On Fri, Dec 16, 2011 at 8:52 PM, Kent Tong<freemant2...@yahoo.com> wrote:
Hi,
From the source code I can see that for each key, the hash (token), the key
itself (ByteBuffer) and the position (long. offset in the sstable) are stored into
the key cache. The hash is an MD5 hash, so it is 16 bytes. So, the total size
required is at least 16+size-of(key)+4 which is> 20 bytes. If we consider the
overhead of the object references, then it will be even larger. Then, why the wiki
recommends multiplying the number of keys cached with 10-12 to get the memory
requirement?
In a word: java.
-Brandon
Wow, Java is a lot better than I thought if it can perform that kind of
magic. I'm guessing the wiki information is just old and out of date.
It's probably more like 60 + sizeof(key)
