Thank you JD. My hbase works as a log archive storage, there is a continuing stream of inserting. So it is normally write heavy. Is there any advice for this scenario? Thanks.
Sean 2011/6/14 Jean-Daniel Cryans <[email protected]> > Unless your normal workload is very heavy on writes (which is Wayne's > case), you're better off using bulk loading: > http://hbase.apache.org/bulk-loads.html > > J-D > > On Mon, Jun 13, 2011 at 12:26 AM, Sheng Chen <[email protected]> > wrote: > > I've met with the same problem. > > Update operations are blocked by memstore flushing, and memstore flushing > is > > blocked by a compaction ("too many store files, delay flushing for 90s"). > > > > Have you got any solutions? > > > > 2011/5/23 Wayne <[email protected]> > > > >> We have 4 CFs, but only 1 is ever used for a given region. What about > >> upping > >> the size per memstore file to 1G? We have 5x limit of 256m which results > in > >> lots of messages like "memstore size 1.3g is >= than blocking 1.2g > size". > >> Maybe given the bigger region size we need a bigger memstore size? > >> > >> Here is a region server log snippet for this occurring 2x in less than a > 2 > >> minute period. > >> > >> http://pastebin.com/CxAQSXTt > >> > >> > >> On Mon, May 23, 2011 at 11:33 AM, Stack <[email protected]> wrote: > >> > >> > On Mon, May 23, 2011 at 6:40 AM, Wayne <[email protected]> wrote: > >> > > In order to reduce the total number of regions we have up'd the max > >> > region > >> > > size to 5g. This has kept us below 100 regions per node but the side > >> > affect > >> > > is pauses occurring every 1-2 min under heavy writes to a single > >> region. > >> > We > >> > > see the "too many store files delaying flush up to 90sec" warning > every > >> > > couple of minutes. We have upped the size of the memstore flush size > >> > (256m) > >> > > as well as upped the blockingstorefiles (15) but these pauses > >> > > are occurring more than writes are occurring. In the end our write > >> > > through-put has degraded considerably. > >> > > > >> > > >> > How many column families? Pastebin a regionserver log. You could up > >> > the number of store files before we put up the blocking writes gate > >> > but then you might have runaway files to compact. > >> > > >> > St.Ack > >> > > >> > > >
