[GitHub] [accumulo] milleruntime commented on issue #2085: Unassigned tables on every restart accumulo 1.10.1

[GitBox <gi...@apache.org>]

milleruntime commented on issue #2085:
URL: https://github.com/apache/accumulo/issues/2085#issuecomment-847047942


   There are a number of factors that could affect Tablet migration (tablet size, number of tablets, number of tservers, recovery, configuration). Are you using the default configured Load Balancer (see `table.balancer` property) DefaultLoadBalancer? If so, it will attempt to keep an even number of tablets across all tservers. When a tablet gets migrated from one tserver to another, it will get unloaded and then loaded on the new tserver. So if the tablet has a Write Ahead Log (WAL) associated with it, it will do recovery on the WAL. If you are having issues with WALs (based on the previous comments) then this would hold up loading of the tablets with the problematic WALs.
   
   If you have resolved the WAL problems, then you might want to look into using a different load balancer. See this blog post about the GroupBalancer: https://accumulo.apache.org/blog/2015/03/20/balancing-groups-of-tablets.html


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