Hello, I would like to understand more in-depth how fault tolerance is handled in HBase:
1. So for each put operation an RS first writes to an HLog file and then to the Memstore. If the RS crashes the HLog file is replayed by other servers, correct? My question is how is this HLog file different from a StoreFile? Why is it faster to write to an HLog file and not write directly to a StoreFile? 2. How is fault tolerance handled for an RS with a coprocessor loaded? Will other servers load that coprocessor if the original RS crashes? If yes, will the HLog be replayed with the coprocessor already loaded? Thanks in advance for the responses. -- Sever Fundatureanu Vrije Universiteit Amsterdam E-mail: fundatureanu.se...@gmail.com
