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stack commented on HBASE-5270: ------------------------------ bq. So, the param 'definitiveRootServer' is used in this case to ensure the dead root server is carryingRoot when it is being expired. Whats 'definitive' about it? Is it that we know for sure the server was carrying root or meta? How? bq. Is there any possible to expire a server if its carrying root and meta now? I don't think so. You are saying that this patch does nothing new here? We COULD expire the server that was carrying root, wait on its log split, then expire the server carrying meta (though it may have been the same server)... it might be ok but we might kill a server that has just started. I'm ok if fixing this is outside scope of this patch. bq. I don't find this operation earlier in master setup, and this operation is not introduced by this issue. And I only introduce this logic for 90 from trunk. So, you copied this to 0.90 from TRUNK (so my notion that we already had this is my remembering how things work on TRUNK.. that would make sense). bq. I think we need explain it, But whether we shouldn't use distributed split log, I'm not very sure. If we are not sure, we shouldn't do it. bq. When matser is initializing, if one RS is killed and restart, then dead server is in progress while master startup This seems like a small window. Or do you think it could happen frequent? Could we hold up shutdownserverhandler until master is up? > Handle potential data loss due to concurrent processing of processFaileOver > and ServerShutdownHandler > ----------------------------------------------------------------------------------------------------- > > Key: HBASE-5270 > URL: https://issues.apache.org/jira/browse/HBASE-5270 > Project: HBase > Issue Type: Sub-task > Components: master > Reporter: Zhihong Yu > Fix For: 0.94.0, 0.92.1 > > > This JIRA continues the effort from HBASE-5179. Starting with Stack's > comments about patches for 0.92 and TRUNK: > Reviewing 0.92v17 > isDeadServerInProgress is a new public method in ServerManager but it does > not seem to be used anywhere. > Does isDeadRootServerInProgress need to be public? Ditto for meta version. > This method param names are not right 'definitiveRootServer'; what is meant > by definitive? Do they need this qualifier? > Is there anything in place to stop us expiring a server twice if its carrying > root and meta? > What is difference between asking assignment manager isCarryingRoot and this > variable that is passed in? Should be doc'd at least. Ditto for meta. > I think I've asked for this a few times - onlineServers needs to be > explained... either in javadoc or in comment. This is the param passed into > joinCluster. How does it arise? I think I know but am unsure. God love the > poor noob that comes awandering this code trying to make sense of it all. > It looks like we get the list by trawling zk for regionserver znodes that > have not checked in. Don't we do this operation earlier in master setup? Are > we doing it again here? > Though distributed split log is configured, we will do in master single > process splitting under some conditions with this patch. Its not explained in > code why we would do this. Why do we think master log splitting 'high > priority' when it could very well be slower. Should we only go this route if > distributed splitting is not going on. Do we know if concurrent distributed > log splitting and master splitting works? > Why would we have dead servers in progress here in master startup? Because a > servershutdownhandler fired? > This patch is different to the patch for 0.90. Should go into trunk first > with tests, then 0.92. Should it be in this issue? This issue is really hard > to follow now. Maybe this issue is for 0.90.x and new issue for more work on > this trunk patch? > This patch needs to have the v18 differences applied. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira