hbase-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Ski Gh3" <ski...@gmail.com>
Subject Re: log replication in hbase
Date Tue, 21 Oct 2008 17:42:50 GMT
The last "yes" is contradictary with the previous one...
So I take this redo log is the WAL log?
It is written to HDFS (replicated three times) rather than stored on the
regionserver itself locally?

Thanks!
On Mon, Oct 20, 2008 at 9:33 PM, stack <stack@duboce.net> wrote:

> Ski Gh3 wrote:
>
>> Just want to make sure my understanding of the log is correct:
>>
>> each regionserver has one log for all the regions it is serving.
>>
>>
>
> Yes.
>
>  this log is the write-ahead log that is stored on hadoop dfs and always
>> written before a data is written to memcache.
>> is this correct?
>>
>>
>
> Yes.
>
>  I read about a redo log from the mailing list, which says each
>> regionserver
>> maintains a redo log locally.
>> is this the wal log or what is the purpose of this redo log?
>>
>>
> Yes.
>
> Sorry for any confusion.  We should be try and be more strict with our
> nomenclature.
>
> St.Ack
>
>

Mime
  • Unnamed multipart/alternative (inline, None, 0 bytes)
View raw message