3x。 发自我的 iPhone
在 2011-9-13，13:01，Todd Lipcon <t...@cloudera.com> 写道： > Hi Kang Hua, > > It sounds like the software you're building works just like HBase - > HBase is essentially a log structure database. We indeed call hflush() > on every edit (in addition to performing Group Commit for better > throughput) > > You might check out the HBase source and look particularly at the HLog class. > > -Todd > > 2011/9/12 kang hua <kanghua...@msn.com>: >> Hi Todd Lipcon: >> >> I am developing a log structure -like filesystem on hdfs . I hope data will >> not be lost when machine that client on hanppen to crash, so I hope to flush >> operation log to hdfs as soon as possible for roll forword when back from >> crash. However , operation log is small , So I flush it very frequently 。 >> >> I use hflush methodfor above scenery ? It is resonable? and Can I >> use hdfsAvailable method(or others) to get file lenght that I hflush to but >> not close ? >> >> kanghua >> >> Thansk you >> > > > > -- > Todd Lipcon > Software Engineer, Cloudera >
