Hi,
In the Strata 2013 training lectures, Jonathan Hsieh from Cloudera said
something about HBase syncs which I'm trying to understand further.
He said that HBase sync guarantees only that a write goes to the local disk
on the region server responsible for that region and in-memory copies go on
2
yes. datanode write is pipeline. and only if pipeline writing finished, dn
return ok.
--Send from my Sony mobile.
On Jun 11, 2013 8:27 AM, "Lucas Stanley" wrote:
> Hi,
>
> In the Strata 2013 training lectures, Jonathan Hsieh from Cloudera said
> something about HBase syncs which I'm trying to un
Thanks Azuryy!
So, when a write is successful to the WAL on the responsible region server,
in fact that means that the write was committed to 3 total DataNodes,
correct?
On Mon, Jun 10, 2013 at 5:37 PM, Azuryy Yu wrote:
> yes. datanode write is pipeline. and only if pipeline writing finished,
Hi Lucas,
First, the write request for HBase consists of two parts:
1. Write into WAL;
2. Write into Memstore, when Memstore reaches the threshold, the data in
Memstore will be flushed into disk.
In my understanding, there are two data synchronization points:
The first one is write to WAL. As WA
yes,
when a write is successful to the WAL on the responsible region server,
in fact that means that the write was committed to 3 total DataNodes
--Send from my Sony mobile.
On Jun 11, 2013 8:40 AM, "Lucas Stanley" wrote:
> Thanks Azuryy!
>
> So, when a write is successful to the WAL on the resp
