Hi Traiq,
I'll try that and update the result , thanks.
> It does. These excerpts from Hbase Definitive Guide might help you in a
> better fashion :
>
> "HTablePool:
> Instead of creating an HTable instance for every request from your client
> application, it
> makes much more sense to create one initially and subsequently reuse them.
> The primary reason for doing so is that creating an HTable instance is a
> fairly expensive
> operation that takes a few seconds to complete. In a highly contended
> environment
> with thousands of requests per second, you would not be able to use this
> approach at
> all—creating the HTable instance would be too slow. You need to create the
> instance
> at startup and use it for the duration of your client’s life cycle.
> There is an additional issue with the HTable being reused by multiple
> threads within
> the same process.
>
> The HTable class is not thread-safe, that is, the local write buffer is not
> guarded against concurrent modifications. Even if you were to use
> setAutoFlush(true) this is not advisable. Instead, you should use
> one instance of HTable for each thread you are running in your client
> application.
>
> Clients can solve this problem using the HTablePool class. It only serves
> one purpose,
> namely to pool client API instances to the HBase cluster."
>
> HTH
>
> Warm Regards,
> Tariq
> https://mtariq.jux.com/
> cloudfront.blogspot.com
>
>
> On Mon, Jan 28, 2013 at 5:54 PM, Lsshiu <[email protected]> wrote:
>
>> Hi Tariq,
>> Thanks for the update, I'll try it. Btw , will put operation makes any
>> performance difference using htable or htablepool ?
>>
>>
>>> Use "HTbalePool" instead and see if it gives you better performance.
>>> Creating an HTable instance is a fairly expensive operation that takes a
>>> few seconds to complete.
>>>
>>> Warm Regards,
>>> Tariq
>>> https://mtariq.jux.com/
>>> cloudfront.blogspot.com
>>>
>>>
>>> On Mon, Jan 28, 2013 at 5:35 PM, Lsshiu <[email protected]> wrote:
>>>
>>>>
>>>>
>>>> Hi Tariq,
>>>> Thanks for the tip, but I only opened a few htable instances. The
>>>> total region numbers were quite many (more than 70000 ) though.
>>>>
>>>>> Hi there,
>>>>>
>>>>> Do you have too many Htable instances opened simultaneously?It's not
>>>>> advisable to do so.
>>>>>
>>>>> Warm Regards,
>>>>> Tariq
>>>>> https://mtariq.jux.com/
>>>>> cloudfront.blogspot.com
>>>>>
>>>>>
>>>>> On Mon, Jan 28, 2013 at 5:00 PM, Lsshiu <[email protected]> wrote:
>>>>>
>>>>>> Hi
>>>>>> In my 0.90.6 hbase environment , each time when I try "new htable, "
>> it
>>>>>> was slow. "Put " also slow too. Can I turn on some kind of trace to
>> know
>>>>>> the exact time spent in each detail function call? Thanks.
>>
