On 11/6/08 10:17 PM, "C G" <[EMAIL PROTECTED]> wrote:
> I've got a grid which has been up and running for some time. It's been using a
> 32 bit JVM. I am hitting the wall on memory within NameNode and need to
> specify max heap size > 4G. Is it possible to switch seemlessly from 32bit
> JVM to 64bit? I've tried this on a small test grid and had no issues, but I
> want to make sure it's OK to proceed.
It should be. We run name node with 64-bit JVM and everything else with
32-bit.
> Speaking of NameNode, what does it keep in memory? Our memory usage ramped up
> rather suddenly recently.
Some one/thing created a ton of files, likely small. Check your file
system contents, use the fs count command, etc, to look for anomalies.
> Also, does SecondaryNameNode require the same
> amount of memory as NameNode?
We're actually starting to see that it requires a tad bit more.
