Short circuit read can cause it to spike CPU and IO wait issues ? Rahul
On Wed, May 13, 2015 at 9:41 AM, rahul malviya <malviyarahul2...@gmail.com> wrote: > Yes. > > On Wed, May 13, 2015 at 9:40 AM, Ted Yu <yuzhih...@gmail.com> wrote: > >> Have you enabled short circuit read ? >> >> Cheers >> >> On Wed, May 13, 2015 at 9:37 AM, rahul malviya < >> malviyarahul2...@gmail.com> >> wrote: >> >> > Hi, >> > >> > I have recently started running MR on hbase snapshots but when the MR is >> > running there is pretty high CPU usage on datanodes and I start seeing >> IO >> > wait message in datanode logs and as soon I kill the MR on Snapshot >> > everything come back to normal. >> > >> > What could be causing this ? >> > >> > I am running cdh5.2.0 distribution. >> > >> > Thanks, >> > Rahul >> > >> > >
