Hello, I'm a newbie and wondering whether or not there is any restriction during HBase minor/major compactions. I read the online document but could not find any explicit mention about restrictions. What I'm mostly worrying about is whether read/write operations are blocked during compactions.
The description about 'hbase.hstore.blockingWaitTime': --- The time an HRegion will block updates for after hitting the StoreFile limit defined by hbase.hstore.blockingStoreFiles. After this time has elapsed, the HRegion will stop blocking updates even if a compaction has not been completed. Default: 90 seconds. --- implies that updates are blocked during compactions, but at the same time it says that there are cases where blocking updates is stopped even if a compaction has not been completed. However, does it mean that the compaction is aborted or that the compaction continues and updates are performed successfully? And if the latter case is true, what is the reason to block updates during compactions? I'm confused. If duration of major compactions were short enough, synchronous blocking would be acceptable. But I saw some comments saying major compactions took hours, and if it is true and if updates need be blocked during compactions, I would be at a loss on how to configure HBase to assure that updates can be done anytime. Could you give me some insights about this, please? Best Regards, Takahiko Kawasaki
