Uhm,
Lets take a look back at the original post :
I'm confused with a read latency I got, comparing to what YCSB team achieved
and showed in their YCSB paper. They achieved throughput of up to 7000
ops/sec with a latency of 15 ms (page 10, read latency chart). I can't get
throughput higher than
Pardon yes that is probably true. I hijacked this thread anyway. /eot
Best regards,
- Andy
On Apr 11, 2012, at 11:04 PM, Michael Segel michael_se...@hotmail.com wrote:
Uhm,
Lets take a look back at the original post :
I'm confused with a read latency I got, comparing to what YCSB team
No need for pardon.
I mean its good to hear about the changes to help improve performance. :-)
I just wanted to try and answer the OPs question and set a realistic
expectation.
-Mike
On Apr 12, 2012, at 1:14 AM, Andrew Purtell wrote:
Pardon yes that is probably true. I hijacked this thread
i have a problem starting regionservers on slave pc,s. when i enlist only
master pc in conf/regionservers every thing works fine but when i add two
more slaves to it the hbase does not start . if i delete all hbase
folders in the tmp folder from all pc,s and then start regionserver (with 3
Thanks Stack,
We have successfully restored our Hadoop/HBase cluster to a healthy state.
It seems that moving the pig and zookeeper references to the back of the
HADOOP_CLASSPATH so that the backticked `hbase classpath` came first in the
HADOOP_CLASSPATH resolved the issue.
I have not
In case you haven't checked yet:
* http://hbase.apache.org/bulk-loads.html
* http://hbase.apache.org/book.html
Alex Baranau
--
Sematext :: http://blog.sematext.com/ :: Solr - Lucene - Hadoop - HBase
On Wed, Apr 11, 2012 at 10:06 PM, Neha justn...@in.com wrote:
I am a newbie in HBase. I am
And the HBase: THe Definitive Guide book from Lars George
http://shop.oreilly.com/product/0636920014348.do
On 04/12/2012 08:14 AM, Alex Baranau wrote:
In case you haven't checked yet:
* http://hbase.apache.org/bulk-loads.html
* http://hbase.apache.org/book.html
Alex Baranau
--
Sematext
On Thu, Apr 12, 2012 at 2:52 AM, Tom Wilcox tom.wil...@cse.org.uk wrote:
I have not confirmed this, but I have suspicions that the old hbase client
references were coming from the pig contributions to the classpath. I am
wondering if perhaps the current hbase and zookeeper libs would have
On Thu, Apr 12, 2012 at 12:50 AM, amsal amsal_na...@yahoo.com wrote:
i have a problem starting regionservers on slave pc,s. when i enlist only
master pc in conf/regionservers every thing works fine but when i add two
more slaves to it the hbase does not start . if i delete all hbase
Still doing it old school unless I have to alter a bunch of tables for
the same reason, like enabling replication.
J-D
On Mon, Apr 9, 2012 at 9:08 AM, Ian Varley ivar...@salesforce.com wrote:
All:
I'm doing a little research into various ways to apply schema modifications
to an HBase
On 12 Apr 2012, at 15:49, Stack wrote:
On Thu, Apr 12, 2012 at 2:52 AM, Tom Wilcox tom.wil...@cse.org.uk wrote:
I have not confirmed this, but I have suspicions that the old hbase client
references were coming from the pig contributions to the classpath. I am
wondering if perhaps the
There only 'transaction' HBase provides is row-level transaction.
On Thu, Apr 12, 2012 at 3:10 PM, Bing Li lbl...@gmail.com wrote:
Dear all,
Is HBase thread-safety? Do I need to consider the consistency issue when
manipulating HBase?
Thanks so much!
Best regards,
Bing
--
--Sean
re: Is HBase thread-safety?
HTable instances are not thread safe, though.
http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/client/HTable.html
On 4/12/12 6:10 PM, Bing Li lbl...@gmail.com wrote:
Dear all,
Is HBase thread-safety? Do I need to consider the consistency issue when
Hi Bing,
Which part? The server certainly is thread safe.
The client is not, at least not all the way through.
The main consideration is HTable, which is not thread safe, you need to create
one instance for each thread
(HBASE-4805 makes that much cheaper), store the HTable in a ThreadLocal
Dear Iars,
Thanks so much for your reply!
In my case, I need to overwrite or update a HTable. If reading during the
process of updating or overwriting, any exceptions will be thrown by HBase?
If multiple instances for a HTable are used by multiple threads, there must
be inconsistency among
client.HConnectionManager$HConnectionImplementation: ZooKeeper available
but no active master location found
Having a problem with master startup that I have not seen before.
running the following packages:
hadoop-hbase-0.90.4+49.137-1
hadoop-0.20-secondarynamenode-0.20.2+923.197-1
1. A pre-row lock is here during the update, so other clients will block
whild on client performs an update.(see HRegion.put 's annotaion), no
exception.
In the client side, while a process is updating, it may not reach the
buffersize so the other process may read the original value, I think.
2.
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