liutang123 edited a comment on issue #4104: URL: https://github.com/apache/incubator-doris/issues/4104#issuecomment-661555852
> > There are A, B, C and D 4 BEs. > > tablet t has 3 replicas in A(good), B(good) and C(version miss). > > If now mark D as decommissioned. FE will never delete replica in C and can not choose D to create new replica. > > I think this case will fall into this branch: > > https://github.com/apache/incubator-doris/blob/2de4f2471bd729e9f723ca8cdd5d9abfe69bf8eb/fe/src/main/java/org/apache/doris/catalog/Tablet.java#L476-L478 > > So it can not run to the code you modified in #4105 Sorry, decommission one BE may not encounter this bug. Please refer to the complicated situation. > The complex situation is: > There are A, B, C, D and E 5 BEs. > tabletA has replicas a1(A)(good), a2(B)(good), a3(C)(version miss), a4(D)(good) > tabletB has replicas b1(A)(good), b2(B)(good), b3(c)(version miss), b4(E)(good) > Because tabletA and tabletB are all `REPLICA_RELOCATING`, but they can not find a BE to create new replica. > a4 prevents D from being deleted and b4 prevents E from being deleted. > The repair and decommission will hang. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@doris.apache.org For additional commands, e-mail: commits-h...@doris.apache.org
