On 11/9/10 5:15 AM, Wayne wrote:
We are trying to use snapshots etc. to back up the data
but it is slow (hours) and slows down the entire node.
The snapshot process (as I understand it, and with the caveat that this
is the code path without JNA available) first flushes all memtables
(this can take a while, and can trigger minor compaction) and then does
the following per SSTable :
a) flushes all memtables ()
b) fork process (this can take a while depending on heap size)
c) ln /path/to/SSTable-etc.db /path/to/snapshot
In general this process should not take "hours". Are you perhaps, in a
case where you have a very large number of SSTable files in a dir and
are not using JNA? I have seen snapshots lag in those circumstances, but
those circumstances were usually pathological..
=Rob
