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Re: Storing images in Hbase
Could HCatalog be an option ?
Le 26 janv. 2013 21:56, "Jack Levin" <[EMAIL PROTECTED]> a écrit :
>
> AFAIK, namenode would not like tracking 20 billion small files :)
>
> -jack
>
> On Sat, Jan 26, 2013 at 6:00 PM, S Ahmed <[EMAIL PROTECTED]> wrote:
> > That's pretty amazing.
> >
> > What I am confused is, why did you go with hbase and not just straight
into
> > hdfs?
> >
> >
> >
> >
> > On Fri, Jan 25, 2013 at 2:41 AM, Jack Levin <[EMAIL PROTECTED]> wrote:
> >
> >> Two people including myself, its fairly hands off. Took about 3 months
to
> >> tune it right, however we did have had multiple years of experience
with
> >> datanodes and hadoop in general, so that was a good boost.
> >>
> >> We have 4 hbase clusters today, image store being largest
> >> On Jan 24, 2013 2:14 PM, "S Ahmed" <[EMAIL PROTECTED]> wrote:
> >>
> >> > Jack, out of curiosity, how many people manage the hbase related
servers?
> >> >
> >> > Does it require constant monitoring or its fairly hands-off now?
 (or a
> >> bit
> >> > of both, early days was getting things write/learning and now its
purring
> >> > along).
> >> >
> >> >
> >> > On Wed, Jan 23, 2013 at 11:53 PM, Jack Levin <[EMAIL PROTECTED]>
wrote:
> >> >
> >> > > Its best to keep some RAM for caching of the filesystem, besides we
> >> > > also run datanode which takes heap as well.
> >> > > Now, please keep in mind that even if you specify heap of say 5GB,
if
> >> > > your server opens threads to communicate with other systems via RPC
> >> > > (which hbase does a lot), you will indeed use HEAP +
> >> > > Nthreads*thread*kb_size.  There is a good Sun Microsystems document
> >> > > about it. (I don't have the link handy).
> >> > >
> >> > > -Jack
> >> > >
> >> > >
> >> > >
> >> > > On Mon, Jan 21, 2013 at 5:10 PM, Varun Sharma <[EMAIL PROTECTED]>
> >> > wrote:
> >> > > > Thanks for the useful information. I wonder why you use only 5G
heap
> >> > when
> >> > > > you have an 8G machine ? Is there a reason to not use all of it
(the
> >> > > > DataNode typically takes a 1G of RAM)
> >> > > >
> >> > > > On Sun, Jan 20, 2013 at 11:49 AM, Jack Levin <[EMAIL PROTECTED]>
> >> > wrote:
> >> > > >
> >> > > >> I forgot to mention that I also have this setup:
> >> > > >>
> >> > > >> <property>
> >> > > >>   <name>hbase.hregion.memstore.flush.size</name>
> >> > > >>   <value>33554432</value>
> >> > > >>   <description>Flush more often. Default: 67108864</description>
> >> > > >> </property>
> >> > > >>
> >> > > >> This parameter works on per region amount, so this means if any
of
> >> my
> >> > > >> 400 (currently) regions on a regionserver has 30MB+ in
memstore, the
> >> > > >> hbase will flush it to disk.
> >> > > >>
> >> > > >>
> >> > > >> Here are some metrics from a regionserver:
> >> > > >>
> >> > > >> requests=2, regions=370, stores=370, storefiles=1390,
> >> > > >> storefileIndexSize=304, memstoreSize=2233,
compactionQueueSize=0,
> >> > > >> flushQueueSize=0, usedHeap=3516, maxHeap=4987,
> >> > > >> blockCacheSize=790656256, blockCacheFree=255245888,
> >> > > >> blockCacheCount=2436, blockCacheHitCount=218015828,
> >> > > >> blockCacheMissCount=13514652, blockCacheEvictedCount=2561516,
> >> > > >> blockCacheHitRatio=94, blockCacheHitCachingRatio=98
> >> > > >>
> >> > > >> Note, that memstore is only 2G, this particular regionserver
HEAP is
> >> > set
> >> > > >> to 5G.
> >> > > >>
> >> > > >> And last but not least, its very important to have good GC
setup:
> >> > > >>
> >> > > >> export HBASE_OPTS="$HBASE_OPTS -verbose:gc -Xms5000m
> >> > > >> -XX:CMSInitiatingOccupancyFraction=70 -XX:+PrintGCDetails
> >> > > >> -XX:+PrintGCDateStamps
> >> > > >> -XX:+HeapDumpOnOutOfMemoryError
> >> -Xloggc:$HBASE_HOME/logs/gc-hbase.log
> >> > \
> >> > > >> -XX:MaxTenuringThreshold=15 -XX:SurvivorRatio=8 \
> >> > > >> -XX:+UseParNewGC \
> >> > > >> -XX:NewSize=128m -XX:MaxNewSize=128m \
> >> > > >> -XX:-UseAdaptiveSizePolicy \
> >> > > >> -XX:+CMSParallelRemarkEnabled \
> >> > > >> -XX:-TraceClassUnloading
> >> > > >> "
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