Home | About | Sematext search-lucene.com search-hadoop.com
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB
 Search Hadoop and all its subprojects:

Switch to Threaded View
HBase >> mail # dev >> HBase - Secondary Index


Copy link to this message
-
Re: HBase - Secondary Index
Also the WalObserver hooks were also used to ensure that the append to WAL
happens thro them.

Regards
Ram

On Wed, Dec 5, 2012 at 4:58 PM, ramkrishna vasudevan <
[EMAIL PROTECTED]> wrote:

> Thanks Anoop for the reply.  I was planning to reply if not from you.
>
> Regards
> Raml
>
>
> On Wed, Dec 5, 2012 at 4:34 PM, Anoop Sam John <[EMAIL PROTECTED]> wrote:
>
>> Hi Jan
>>          Yes we guarentee the consistency between user table and index
>> table. The put operation will be handled as a transactional way so as to
>> make sure the data is added to both tables or reverted back from both. Some
>> new CP hooks we have added for this obviously.
>>
>> -Anoop-
>> ________________________________________
>> From: Jan Van Besien [[EMAIL PROTECTED]]
>> Sent: Wednesday, December 05, 2012 12:54 AM
>> To: [EMAIL PROTECTED]
>> Subject: Re: HBase - Secondary Index
>>
>> Hi,
>>
>> On 12/04/2012 09:10 AM, Anoop Sam John wrote:
>>  > I would like to hear what others think on this. :)
>>
>> I found it interesting to read your approach on how the indexes can be
>> used to speed up existing scan operations.
>>
>> I couldn't find anything in your presentation though about whether your
>> implementation makes any guarantees to ensure the source table and the
>> index table are always (eventually) in sync.
>>
>> What if data is inserted in the source table and then the region server
>> crashes (before the coprocessor is executed)? Will the index be out of
>> sync? Do you have a mechanisme in place to detect and restore this
>> situation?
>>
>> thanks
>> Jan
>>
>
>
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB