Thanks, Todd. I saw the flush code.
On Fri, Jun 11, 2010 at 9:31 AM, Todd Lipcon <t...@cloudera.com> wrote: > Hi Jeff, > All of the FSNamesystem methods call logSync() before returning to the > client. So, if the edit is lost, it also will not have returned a success to > the client. > -Todd > > On Thu, Jun 10, 2010 at 6:29 PM, Jeff Zhang <zjf...@gmail.com> wrote: >> >> Hi all, >> >> I check the source code of EditLogFileOutputStream, it seems hadoop >> will first write edit log to buffer, then flush to disk. I know that >> it will improve performance, but in the other hand it will cause the >> edit log in buffer lost when the name node is down. So I wonder is it >> possible and necessary to let users do configuration in the conf file >> to decide whether use buffer or not? Thanks. >> >> >> >> -- >> Best Regards >> >> Jeff Zhang > > > > -- > Todd Lipcon > Software Engineer, Cloudera > -- Best Regards Jeff Zhang
