The stack traces of the region servers during the mapper executions didn't
really show much activity. Thus we are focusing on getting a region server
stack trace during the slow downs during regular application activity. It's
still in progress, but we have captured a few traces where all the ipc
bq. a small number will take 20 minutes or more
Were these mappers performing selective scan on big regions ?
Can you pastebin the stack trace of region server(s) which served such
regions during slow mapper operation ?
Pastebin of region server log would also give us more clue.
On Tue, Mar
Recently we have been experiencing short downtimes (~2-5 minutes) in our
hbase cluster and are trying to understand why. Many times we have HLog
write spikes around the down times, but not always. Not sure if this is a
red herring.
We have looked a bit farther back in time and have noticed many
