How are you shutting down and starting up?
For start-up, it works much better if most, if not all tservers are up before the master is started. That way, the assignments are distributed across the available tservers. If you start the master first, what will happen is that when the first few tservers start, the master immediately begins to assign all tablets to them - it then will take considerable time for those few tservers to rebalance and distribute the tablets to the remaining tservers that did not get additional assignments. You should be able to see reassignment messages in the master debug log if your cluster is unbalanced. With 1.10.0, the ability to delay assignments until a threshold number of tserevrs have registered is available to avoid this issue. From: Ligade, Shailesh (ITADD) (CON) <[email protected]> Sent: Friday, September 25, 2020 8:07 AM To: [email protected] Subject: accumulo 1.9 slow startup Hello, We have 45 tservers hosting few tables, max entries in table are 1B Each tserver hosts about 2.3k tablets. When we start accumulo it shows offiline tables and slowly works thru it. After there are no more offline tables it again goes thru 2/3 cycles of offline tablets and and finally I can scan tables. The overall process takes about 25+ minutes What is causing this slowness? Tserver heapsize is set at 24G Memory map is set at 3G Master heapsize is set at 48G Thanks S
