Accumulo do minor-compaction and major-compaction depends on a thresold value ,why not do age-off interval-automatic by ttl value. If I do it use crontab,when I add a new table ,I must update my crontab
> 在 2015年6月6日，13:37，Josh Elser <[email protected]> 写道： > > The decrease in performance you see is probably because the iterator must > read a significant amount of old data. If you don't write new data to a > table, Accumulo will not run any compactions and no data will age-off in the > files on HDFS. > > I think it would be fairly common to use crontab to regularly schedule > compactions over your table so that data is automatically deleted (e.g. > nightly). Accumulo doesn't contain any means to automate this internally. > > Lu Qin wrote: >> I have a big table about 38B entries, and I set a ageoff iterator with a ttl >> about 3 days,I set the iteratorPriority is 10 and apply it in all-scopes. >> >> I stop write data into it about one week,and now I scan it ,but it wait so >> long. I check the monitor page,it show me that the scan speed is 80w >> entries/s. >> >> I think the ageoff is a diferent iterator than others,if all data is out the >> ttl,when I scan the table,it will scan all data in the table and decide to >> remove it,right? Why not do this interval ? >> >> Thanks
