Hey Mingjian, This sounds like a good idea Your patch didn't make it through. Would you mind either filing a JIRA and uploading your patch there or at least posting it to something like pastebin so we can take a look.
-Joey On Jun 29, 2011, at 3:27, Mingjian Deng <[email protected]> wrote: > Hi: > We found that the hlog sync to disk each time. When one thread exec > "doWrite(info, logKey, edit);", the others wait for "updateLock" in HLog.java. > Why not the others add their edits into a list and wait. When sync's > time, the whole list sync to disk once. I think it will decrease the IO > calls. > > So Maybe we will make two lists for edits. Each thread write to the > "waledits" and wait for "updateLock". Each thread can copy the "waledits" to > "flushedits" and flush the "flushedits" to > disk once it gets "updateLock". > > In my test, it can increase the write speed of 40%. > > Just see the HLog.patch. >
