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HBase, mail # user - Tomb Stone Marker


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Re: Tomb Stone Marker
Doug Meil 2012-09-10, 12:22

Hi there...

In this chapter...

http://hbase.apache.org/book.html#datamodel

.. it explains that the "updates" are just a view.  There is a merge
happening across CFs and versions (and delete-markers)..

In this...

http://hbase.apache.org/book.html#regions.arch
9.7.5.5. Compaction

... it explains how and when the delete markers are removed in the
compaction process.

On 9/10/12 2:50 AM, "Monish r" <[EMAIL PROTECTED]> wrote:

>Hi,
>Thanks for the link . If the meta data information for a delete is part of
>key value , then when does this update happen
>
>When the region is re written by minor compaction. ?
>or Is the region  re written for a set of batched deletes ?
>
>
>
>On Sun, Sep 9, 2012 at 6:42 PM, Doug Meil
><[EMAIL PROTECTED]>wrote:
>
>>
>> Hi there,
>>
>> See 9.7.5.4. KeyValue...
>>
>> http://hbase.apache.org/book.html#regions.arch
>>
>> Š the tombstone is one of the keytypes.
>>
>>
>>
>> On 9/9/12 5:21 AM, "Monish r" <[EMAIL PROTECTED]> wrote:
>>
>> >Hi,
>> >I need some clarifications regarding the Tomb Stone Marker .
>> >I was wondering where exactly are the tomb stone markers stored when a
>>row
>> >is deleted .
>> >
>> >Are they kept in some memory area and  updated in the HFile  during
>>minor
>> >compaction ?
>> >If they are updated in the HFile , then what part of a  HFile contains
>> >this
>> >information.
>> >
>> >Regards,
>> >R.Monish
>>
>>
>>