FAQ
I would really like to see some PROOF of these drives "lying".

If that were the case, no database system would ever be reliable on
these drives ! And data corruption would be happening all over the
place !
On Nov 19, 2008, at 10:56 AM, Mark Miller wrote:

Michael McCandless wrote:
Mark Miller wrote:
It is dangerous, but probably not any more dangerous than using a
consumer hard drive that lies to sync (don't know the numbers,
but I have to assume some/many are doing this with Lucene - in
which case you pay perf for a false sense of security<g>).
Well, if the consumer drive is in fact lying, then sync should be
wicked fast ;) So you get a false sense of security without
paying anything!
That occurred to me as well, but they must do some work :) , or the
lie would be to just return...maybe it is. I mean if it doesn't
guarantee, whats the point...oh yeah, to fool benchmarks. Still
boggles my mind.

I wasn't being very serious though. Like I said, I'm not suggesting
we allow it to be turned off, I was just looking for it because I
wanted to debug...your option was just as good for my case.
Not a real suggestion at this point though. Just thinking about
some of the reports I have seen of much slower indexing with 2.4
(the latest being to the solr list today). Can't imagine why
someone would see such a drastic change (I imagine you could
imagine a lot better), other than maybe the sync is hobbling
their specific situation (in which case i'd guess its not lying
if it where going to be so slow though <g> Or its AIX or
something <g>). Would be cool to be able to flip it off and test.
Sounds like thats simple enough already though. I could whip up
an off for solr testing easy enough.
Yeah let's dig down and get to the root cause here -- if turning
off sync in fact fixes the slowdown we should understand why sync
is being called so often.
Yeah, the root cause is likely elsewhere I'm sure...it would have
to be a pretty broken sync to add so much time (im fairly sure hes
using defaults so he not going to have a billion index files to
sync or something). Just captured my attention as a possibility and
I wanted to be able to test without. Most 2.3 - 2.4 changes don't
seem like they would slow things down. Could be a problem with Solr
as well in this particular case though.
Mike

---------------------------------------------------------------------
To unsubscribe, e-mail: java-dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: java-dev-help@lucene.apache.org

---------------------------------------------------------------------
To unsubscribe, e-mail: java-dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: java-dev-help@lucene.apache.org

---------------------------------------------------------------------
To unsubscribe, e-mail: java-dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: java-dev-help@lucene.apache.org

Search Discussions

Discussion Posts

Previous

Follow ups

Related Discussions

Discussion Navigation
viewthread | post
posts ‹ prev | 6 of 16 | next ›
Discussion Overview
groupjava-dev @
categorieslucene
postedNov 19, '08 at 2:33p
activeNov 19, '08 at 6:59p
posts16
users4
websitelucene.apache.org

People

Translate

site design / logo © 2021 Grokbase