Hi jan , I think the reason is the same as why index file using memory mapped file.
As the memory mapped file can avoid the data copy between user and kernel buffer space, so it can improve the performance for the index file IO operation ,right? If it is ,why Log file cannot achieve the same performance improvement as memory mapped index file? Jacky ________________________________ From: jan <rtm4...@googlemail.com> Sent: Saturday, February 10, 2018 8:33 PM To: users@kafka.apache.org Subject: Re: why kafka index file use memory mapped files ,however log file doesn't I'm not sure I can answer your question, but may I pose another in return: why do you feel having a memory mapped log file would be a good thing? On 09/02/2018, YuFeng Shen <v...@hotmail.com> wrote: > Hi Experts, > > We know that kafka use memory mapped files for it's index files ,however > it's log files don't use the memory mapped files technology. > > May I know why index files use memory mapped files, however log files don't > use the same technology? > > > Jacky >
