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From Vladimir Rodionov <vladrodio...@gmail.com>
Subject Re: data write/read consistency issue
Date Mon, 25 Jan 2016 19:21:09 GMT
Writes are not visible until client calls flush on a table.

-Vlad

On Mon, Jan 25, 2016 at 9:18 AM, Stack <stack@duboce.net> wrote:

> Try some more basic and see if you can reproduce the failure to
> read-your-own-writes. Do a put, flush of the writes, then a get. Past too
> your addTagColumn code. Thanks.
> St.Ack
>
> On Mon, Jan 25, 2016 at 12:33 AM, Rural Hunter <ruralhunter@gmail.com>
> wrote:
>
> > No. The code logic is like this:
> > The main method:
> >
> > String rowKey="...";
> > addTagColumn(rowKey, "tag_"+id);
> > List tags=getTagColumns(rowKey);
> > //here I had to add re-try logic to ensure the tags list contains the id
> > just added.
> >
> > addTagColumn method just does a simple HTable.put.
> > getTagColumns uses a ColumnPrefixFilter to get all the columns starting
> > with "tag_".
> >
> > The other possiblity is that some other processes removed the new id
> > between the call of add and get. But we checked other code logic and it
> > seems not likely. or there is a problem with the ColumnPrefixFilter?
> >
> > 2016-01-23 3:42 GMT+08:00 Stack <stack@duboce.net>:
> >
> > > On Fri, Jan 22, 2016 at 1:51 AM, Rural Hunter <ruralhunter@gmail.com>
> > > wrote:
> > >
> > > > Hi,
> > > >
> > > > I have a hbase cluster with 7 servers at version 0.98.13-hadoop2,
> > > > dfs.replication=2.
> > > > In a write session, we update some data. Then in a new read session
> > > > immediately, we read the data using Get class and found it sometimes
> > > > returns the old version of the data(before the update).
> > > > We have to add a retry-loop in the read session to read the correct
> > > value.
> > > > Is this a normal behavior of hbase cluster?
> > > >
> > >
> > >
> > > No.  Tell us more. For sure the Get and Write are not concurrent with
> > > perhaps the Get happening before the update?
> > > St.Ack
> > >
> >
>

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