Hi Roger, I think the math goes like this: If the root tablet is held in 128mb memory and each entry is 1k that means that there can be 128mb/1k = 131072 = 2^17 meta tablets. By the same logic each meta tablet can hold 2^17 entries, so you get 2^17 * 2^17 = 2^34 tablets in total.
-- Lars ________________________________ From: Roger <[email protected]> To: user <[email protected]> Sent: Saturday, February 4, 2012 5:20 AM Subject: How many tablets can bigtable store? Hi everyone, I was reading bigtable paper these days. And from the paper, I have a little question. "Each METADATA row stores approximately 1KB of data in memory. With a modest limit of 128 MB METADATA tablets, our three-level location scheme is sufficient to address 2^34 tablets." I am confusing because 2^10 * 2^7 = 2^17 How could it store 2^34 tablets? ------------------ Regards, Q
