Hi,
I guess Creation of /hbase happen after running table1 = new
HTable("MyTable");
Right, that warning showed up in the client.There doesn't keep any log in
that region server.
When ever I finish to put my data, I would count it by shell.
I put the first 10 files(10M) in five threads. It worked pretty well.
After taking a minutes break, I put next 30 files.It still worked very
quickly.
When I count it, I found it became very very slow.
By checking that region server,I found that region server taken so much
RAM(almost on the top),
and seems not to release it.
Maybe I should lower the flush threshold.(how to do it ? ^_^)
If I don't take a break and continue to put data, that warning raised in
the client.
So, I wonder that region server is too busy to serve the following client
request.
If a client can't reach that busy sever, it would be better to raise some
exception that
I can catch and try to handle it.
Thanks
Fleming
Jonathan Gray
<[email protected] To:
[email protected]
m> cc: (bcc: Y_823910/TSMC)
Subject: Re: Save data to HBase
2009/09/02 10:22
AM
Please respond to
hbase-user
There's no reason to use the write buffer if you are only inserting one
row and then immediately flushing. This code does the exact same thing
as yours:
table1 = new HTable("MyTable");
Put p = new Put(...);
p.add(...);
table1.put(p);
That's it. You would only use the write-buffering if you wanted to send
multiple Puts at once.
As far as the table only having one region, yes this limits all work on
that table to a single node. However with 200MB of data, you are
smaller than the default region size of 256MB. You can lower that split
threshold or you can manually split in the shell or using HBaseAdmin.
Not sure about that ZooKeeper warning... Creation of /hbase should
happen in the master at boot-time, not in a client running inserts. Do
you have anymore detail? That warning showed up in the client?
Anything in the regionserver? Can you use the shell?
JG
[email protected] wrote:
> Hi,
>
> I want to put only 200MB data to a HBase table.
> Just use a single thread to put 1MB data in a time.
> So, there are 200 job in turn.
> It occured WARN zookeeper.ZooKeeperWrapper: Failed to create /hbase,
> while it run to around the 20th job.
> I found that table has just one regin.
> I wonder whether these tight job will make that region server choke.
> About the region split, I want to know when the table's region will be
> splitted.
> Is its threshold setting in hbase-default.xml?
> Following are a snippet of my code about putting my data to hbase,
anything
> can improve it?
>
> table1 = new HTable("MyTable");
> table1.setAutoFlush(false);
> table1.setWriteBufferSize(1024*1024*12);
>
> Put p = new Put(Bytes.toBytes(rs.getString(KeyColumn)));
> p.add(Bytes.toBytes(FamColumn),
> Bytes.toBytes("content"),Bytes.toBytes(json));
> table1.put(p);
>
> table1.flushCommits();
> table1.close();
>
> My cluster is only 3 PC with (1G,1G,2G RAM ,2 core CPU )
> 3 region server
> 3 ZK quorum server
> We'll enlarge our cluster to 12PCs with 8G RAM.
>
> Thanks
>
> Fleming
>
>
>
>
> Amandeep Khurana
> <[email protected] To:
[email protected]
> > cc: (bcc:
Y_823910/TSMC)
> Subject: Re: Save data to
HBase
> 2009/09/02 03:07
> AM
> Please respond to
> hbase-user
>
>
>
>
>
>
> What do you mean by quick way? You can use the api to put data into it
> through a standalone java program or you can use a MR job to do it..
>
>
> On Tue, Sep 1, 2009 at 2:48 AM, <[email protected]> wrote:
>
>> Hi there,
>>
>> Any quick way that I can save my data(12G) to HBase?
>> Thanks
>>
>> Fleming
>>
>
>>
>>
>>
>
>
>
>
>
>
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