问题
Because HBase is based on HDFS, and that HDFS doesn't have update features, I was wondering if the update operations on it rewrites the whole HFILE files on hadoop?
thanks
回答1:
There are no updates in HBase.
When you perform a delete in HBase (the whole row or particular cells), a special deletion marker is added to a cell. Upcoming scans or get operations would not see that cell(s).
When you perform an insert, you just create a new cell with current timestamp. Scan and get operations will return newer version of a cell.
Real physical deletion is perform during HBase major compactions. Also, after compaction number of HFiles is reduced to provide faster read operations.
来源：https://stackoverflow.com/questions/42677201/hbase-update-operations-on-hdfs