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HBase, mail # user - Tune MapReduce over HBase to insert data


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Re: Tune MapReduce over HBase to insert data
Ted Yu 2013-01-13, 15:30
Both HFileOutputFormat and LoadIncrementalHFiles are in mapreduce package.

Cheers

On Sun, Jan 13, 2013 at 1:31 AM, Bing Jiang <[EMAIL PROTECTED]>wrote:

> hi,anoop.
> Why not hbase mapreduce package contains the tools like this?
>
> Anoop John <[EMAIL PROTECTED]>编写:
>
> >Hi
> >             Can you think of using HFileOutputFormat ?  Here you use
> >TableOutputFormat now. There will be put calls to HTable. Instead in
> >HFileOutput format the MR will write the HFiles directly.[No flushes ,
> >compactions] Later using LoadIncrementalHFiles need to load the HFiles to
> >the regions.  May help you..
> >
> >-Anoop-
> >
> >On Sun, Jan 13, 2013 at 10:59 AM, Farrokh Shahriari <
> >[EMAIL PROTECTED]> wrote:
> >
> >> Thank you guys,let me change these configuration & test mapreduce again.
> >>
> >> On Tue, Jan 8, 2013 at 10:31 PM, Asaf Mesika <[EMAIL PROTECTED]>
> >> wrote:
> >>
> >> > Start by testing HDFS throughput by doing s simple copyFromLocal using
> >> > Hadoop command line shell (bin/hadoop fs -copyFromLocal pathTo8GBFile
> >> > /tmp/dummyFile1). If you have 1000Mbit/sec network between the
> computers,
> >> > you should get around 75 MB/sec.
> >> >
> >> > On Tuesday, January 8, 2013, Bing Jiang wrote:
> >> >
> >> > > In our experience, it can enhance mapreduce insert by
> >> > > 1.add regionserver flush thread number
> >> > > 2.add memstore/jvm_heap
> >> > > 3.pre split table region before mapreduce
> >> > > 4.add large and small compaction thread number.
> >> > >
> >> > > please correct me if wrong, or any other better ideas.
> >> > > On Jan 8, 2013 4:02 PM, "lars hofhansl" <[EMAIL PROTECTED]
> >> <javascript:;>>
> >> > > wrote:
> >> > >
> >> > > > What type of disks and how many?
> >> > > > With the default replication factor your 2 (or 6) GB are actually
> >> > > > replicated 3 times.
> >> > > > 6GB/80s = 75MB/s, twice that if you do not disable the WAL, which
> a
> >> > > > reasonable machine should be able to absorb.
> >> > > > The fact that deferred log flush does not help you seems to
> indicate
> >> > that
> >> > > > you're over IO bound.
> >> > > >
> >> > > >
> >> > > > What's your memstore flush size? Potentially the data is written
> many
> >> > > > times during compactions.
> >> > > >
> >> > > >
> >> > > > In your case you dial down the HDFS replication, since you only
> have
> >> > two
> >> > > > physical machines anyway.
> >> > > > (Set it to 2. If you do not specify any failure zones, you might
> as
> >> > well
> >> > > > set it to 1... You will lose data if one of your server machines
> dies
> >> > > > anyway).
> >> > > >
> >> > > > It does not really make that much sense to deploy HBase and HDFS
> on
> >> > > > virtual nodes like this.
> >> > > > -- Lars
> >> > > >
> >> > > >
> >> > > >
> >> > > > ________________________________
> >> > > >  From: Farrokh Shahriari <[EMAIL PROTECTED]
> >> <javascript:;>>
> >> > > > To: [EMAIL PROTECTED] <javascript:;>
> >> > > > Sent: Monday, January 7, 2013 9:38 PM
> >> > > > Subject: Re: Tune MapReduce over HBase to insert data
> >> > > >
> >> > > > Hi again,
> >> > > > I'm using HBase 0.92.1-cdh4.0.0.
> >> > > > I have two server machine with 48Gb RAM,12 physical core & 24
> logical
> >> > > core
> >> > > > that contain 12 nodes(6 nodes on each server). Each node has 8Gb
> RAM
> >> &
> >> > 2
> >> > > > VCPU.
> >> > > > I've set some parameter that get better result like set WAL=off on
> >> > > put,but
> >> > > > some parameters like Heap-size,Deferred log flush don't help me.
> >> > > > Beside that I have another question,why each time I've run
> >> > mapreduce,I've
> >> > > > got different result time while all the config & hardware are
> same &
> >> > not
> >> > > > change ?
> >> > > >
> >> > > > Tnx you guys
> >> > > >
> >> > > > On Tue, Jan 8, 2013 at 8:42 AM, Ted Yu <[EMAIL PROTECTED]
> >> > <javascript:;>>
> >> > > wrote:
> >> > > >
> >> > > > > Have you read through
> >> http://hbase.apache.org/book.html#performance?
> >