How does Omid implement the two phase commit protocol?

鄭凱元

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Oct 30, 2013, 3:40:33 AM10/30/13

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Daniel Gómez Ferro

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Oct 30, 2013, 5:25:06 AM10/30/13

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Hi,

Omid doesn't implement the two phase commit protocol, it uses the Optimistic Concurrency Control approach. The algorithm Omid uses is explained here: https://github.com/yahoo/omid/wiki

Basically, a centralized Status Oracle keeps record of modified rows by all transactions and aborts some of them in case of write-write conflict. Transactions proceed independently of each other but might have to abort at commit time.

Regards,

Daniel

On Wed, Oct 30, 2013 at 8:40 AM, 鄭凱元 <nowitz...@gmail.com> wrote:

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鄭凱元

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Oct 30, 2013, 11:05:28 PM10/30/13

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鄭凱元於 2013年10月31日星期四UTC+8上午10時44分49秒寫道：

If transaction has many put operations and will execute on several regionserver, one of put operation fail, How Omid solve this situation? abort this transaction?

Daniel Gómez Ferro於 2013年10月30日星期三UTC+8下午5時25分06秒寫道：

Daniel Gómez Ferro

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Oct 31, 2013, 4:03:02 AM10/31/13

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Yes, that's right, the transaction will abort.

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