How row delete works

[Gagandeep Singh <ga...@paxcel.net>]

Hi

Can somebody please shed some light on the internal working of the HBase
delete operation. So when I perform a delete operation what exactly happens
underneath the code. Is my data removed immediately from the disk or else a
flag is set by HBase to mark those rows as deleted.

Thanks,
Gagan

RE: How row delete works

[Jonathan Gray <jg...@facebook.com>]

There is also explanation of deletes in the BigTable paper.

http://labs.google.com/papers/bigtable-osdi06.pdf

> -----Original Message-----
> From: Ted Yu [mailto:yuzhihong@gmail.com]
> Sent: Friday, August 20, 2010 8:42 AM
> To: dev@hbase.apache.org
> Subject: Re: How row delete works
> 
> Please refer to this method in HRegion.java:
>   public void delete(Map<byte[], List<KeyValue>> familyMap, boolean
> writeToWAL)
> 
> Also read the javadoc at the beginning of Delete.java
> 
> On Fri, Aug 20, 2010 at 2:51 AM, Gagandeep Singh
> <gagandeep.singh@paxcel.net
> > wrote:
> 
> > Hi
> >
> > Can somebody please shed some light on the internal working of the
> HBase
> > delete operation. So when I perform a delete operation what exactly
> happens
> > underneath the code. Is my data removed immediately from the disk or
> else a
> > flag is set by HBase to mark those rows as deleted.
> >
> > Thanks,
> > Gagan
> >

Re: How row delete works

[Ted Yu <yu...@gmail.com>]

Please refer to this method in HRegion.java:
  public void delete(Map<byte[], List<KeyValue>> familyMap, boolean
writeToWAL)

Also read the javadoc at the beginning of Delete.java

On Fri, Aug 20, 2010 at 2:51 AM, Gagandeep Singh <gagandeep.singh@paxcel.net
> wrote:

> Hi
>
> Can somebody please shed some light on the internal working of the HBase
> delete operation. So when I perform a delete operation what exactly happens
> underneath the code. Is my data removed immediately from the disk or else a
> flag is set by HBase to mark those rows as deleted.
>
> Thanks,
> Gagan
>