Correction: not always visible. To make sure that they are visible - call the table flush or setAutoFlush(true) (not recommended)
-Vlad On Mon, Jan 25, 2016 at 11:21 AM, Vladimir Rodionov <[email protected]> wrote: > Writes are not visible until client calls flush on a table. > > -Vlad > > On Mon, Jan 25, 2016 at 9:18 AM, Stack <[email protected]> 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 <[email protected]> >> 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 <[email protected]>: >> > >> > > On Fri, Jan 22, 2016 at 1:51 AM, Rural Hunter <[email protected]> >> > > 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 >> > > >> > >> > >
