Thank you Yonik, excellent WIKI! I'll try without APR, I believe it's
environmental issue; 100Mbps switched should do 10 times faster (current
replica speed is 1Mbytes/sec)

> -----Original Message-----
> From: ysee...@gmail.com [mailto:ysee...@gmail.com] On Behalf Of Yonik
> Seeley
> Sent: January-03-10 10:03 AM
> To: solr-user@lucene.apache.org
> Subject: Re: SOLR: Replication
> 
> On Sat, Jan 2, 2010 at 11:35 PM, Fuad Efendi <f...@efendi.ca> wrote:
> > I tried... I set APR to improve performance... server is slow while
> replica;
> > but "top" shows only 1% of I/O wait... it is probably environment
> specific;
> 
> So you're saying that stock tomcat (non-native APR) was also 10 times
> slower?
> 
> > but the same happened in my home-based network, rsync was 10 times
> faster...
> > I don't know details of HTTP-replica, it could be base64 or something
> like
> > that; RAM-buffer, flush to disk, etc.
> 
> The HTTP replication is using binary.
> If you look here, it was benchmarked to be nearly as fast as rsync:
> http://wiki.apache.org/solr/SolrReplication
> 
> It does do a fsync to make sure that the files are on disk after
> downloading, but that shouldn't make too much difference.
> 
> -Yonik
> http://www.lucidimagination.com


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