our hbase version is 0.20.4 . hadoop version is 0.20.2 在 2010年7月29日 上午10:09，baggio liu <[email protected]>写道：
> Hi all， > We have 53 machines in our hbase cluster and run 6 clients to scan a > table. During scanning, we found when a region is scanning , it'll new > StoreFile object, create a connection to datanode (in fact , create HFile > Reader), so the number of connection increases by the number of store files. > We have many store files ,(cross several regions and has not reach minor > compaction thredshould), too many connections has been created. And after > scanning, the connection will not closed. > As the result of it , a machine which act as region server has too high > system CPU, and hung for a long time. > My question is : > 1. Why we don't close connection ( in fact, we don't close > HFile.Reader)after we complete to scan table ? We wanna to reuse connection > in the next scan ?? > 2. How can we limit the connection number ? > > Thanks & Best regards > LiuJinglong > >
