HBASE-28197 The configs for using meta replica can conflict
We should use "hbase.meta.replicas.use" to control the switch of reading meta replicas. But the codes before this PR reading from meta replicas only when "hbase.locator.meta.replicas.mode" is not NONE, it supassed the switch controller. The UT can reproduce the problem.
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Have you check the ref guide? For me, I think setting the replica mode to something other than NONE indicates that the user wants to use meta replica?
Have you check the ref guide? For me, I think setting the replica mode to something other than NONE indicates that the user wants to use meta replica?
Thanks, @Apache9 . The ref guide doesn't bound the relation ship between the two configs. I think, when we enabling the meta replica, we will set both the two configs under normal circumstances. But when encountering problems caused by meta replica, disable it throught the configs is a quick recover method. The key problem here is that we should disable meta replica by only one config("hbase.meta.replicas.use") or both the relevant configs. I prefer the first way, but I'm neutral on both the ways.
So the aim here is to enforce the "LOAD_BALANCE" reading mode only if "USE_META_REPLICAS" is explicitly set?
Yes, @wchevreuil . My initial thought was when "USE_META_REPLICAS" is false, we should not read the value of "LOAD_BALANCE". But this maybe miss some original design idea. Let's wait for a consensus. Thanks.
Have you check the ref guide? For me, I think setting the replica mode to something other than NONE indicates that the user wants to use meta replica?
Thanks, @Apache9 . The ref guide doesn't bound the relation ship between the two configs. I think, when we enabling the meta replica, we will set both the two configs under normal circumstances. But when encountering problems caused by meta replica, disable it throught the configs is a quick recover method. The key problem here is that we should disable meta replica by only one config("hbase.meta.replicas.use") or both the relevant configs. I prefer the first way, but I'm neutral on both the ways.
Maybe at client side we just do not care about hbase.meta.replicas.use? The hbase.meta.replicas.use config is only for server side. So maybe a more suitable way here is that, at server side, like when initialize a region server or master, when hbase.meta.replicas.use is set to false, we force set the replica mode to NONE as it is useless to use other replica modes?
Have you check the ref guide? For me, I think setting the replica mode to something other than NONE indicates that the user wants to use meta replica?
Thanks, @Apache9 . The ref guide doesn't bound the relation ship between the two configs. I think, when we enabling the meta replica, we will set both the two configs under normal circumstances. But when encountering problems caused by meta replica, disable it throught the configs is a quick recover method. The key problem here is that we should disable meta replica by only one config("hbase.meta.replicas.use") or both the relevant configs. I prefer the first way, but I'm neutral on both the ways.
Maybe at client side we just do not care about
hbase.meta.replicas.use? Thehbase.meta.replicas.useconfig is only for server side. So maybe a more suitable way here is that, at server side, like when initialize a region server or master, whenhbase.meta.replicas.useis set to false, we force set the replica mode to NONE as it is useless to use other replica modes?
Thanks, @Apache9 . I think the config hbase.meta.replicas.use appears before hbase.locator.meta.replicas.mode, which is brought by HBASE-25126 to introduce more meta access mode for clients. And at the server side, in the initialization of regionserver and master, the hbase.meta.replicas.use actively force the setting to false, see line https://github.com/apache/hbase/blob/29bfc610d0433f720a34bc47aadca1433bbb1882/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java#L515 and https://github.com/apache/hbase/blob/29bfc610d0433f720a34bc47aadca1433bbb1882/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java#L529. As a result, I think the replica mode should be force set to NONE at both server side and client side. What do you think?
@huaxiangsun WDYT?