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https://issues.apache.org/jira/browse/HBASE-8974?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nick Dimiduk resolved HBASE-8974.
---------------------------------
Resolution: Not A Problem
Based on JMS's look, this is an issue in the script-side logging and isn't a
real issue.
> bin/rolling-restart.sh restarts all active RS's with each iteration instead
> of one at a time
> --------------------------------------------------------------------------------------------
>
> Key: HBASE-8974
> URL: https://issues.apache.org/jira/browse/HBASE-8974
> Project: HBase
> Issue Type: Bug
> Components: scripts
> Reporter: Nick Dimiduk
> Assignee: Nick Dimiduk
> Priority: Critical
> Fix For: 0.95.2
>
>
> I'm exercising the patch over on HBASE-8803 and I've noticed something in the
> logs: it looks like {{rolling-restart.sh}} is restarting all the region
> servers multiple times instead of just the current entry in the loop
> iteration.
> The logic looks like this:
> {noformat}
> for each rs in active region server list:
> unload $rs // move all regions to other RS's
> restart all Region Servers // !?! bug?
> reload $rs // pile 'em back on
> {noformat}
> Shouldn't that step 2 be only {{restart $rs}}?
> This is what I see in the logs. My cluster has 9 active RegionServers. Notice
> the bit in the middle where all 9 are stopped and started again after
> unloading the target RS.
> {noformat}
> $ time /usr/lib/hbase/bin/rolling-restart.sh --rs-only --graceful
> --maxthreads 30
>
> Gracefully restarting: hor18n39.gq1.ygridcore.net
> Disabling balancer!
> ...
> Unloading hor18n39.gq1.ygridcore.net region(s)
> ...
> Valid region move targets:
> hor18n37.gq1.ygridcore.net,60020,1374094975268
> hor17n37.gq1.ygridcore.net,60020,1374094975264
> hor18n35.gq1.ygridcore.net,60020,1374094975327
> hor17n39.gq1.ygridcore.net,60020,1374094975281
> hor18n36.gq1.ygridcore.net,60020,1374094975254
> hor17n36.gq1.ygridcore.net,60020,1374094975277
> hor17n34.gq1.ygridcore.net,60020,1374094975291
> hor18n38.gq1.ygridcore.net,60020,1374094975259
> 13/07/17 21:44:38 INFO region_mover: Moving 330 region(s) from
> hor18n39.gq1.ygridcore.net,60020,1374094975326 during this cycle
> 13/07/17 21:44:38 INFO region_mover: Moving region
> b59050cf97aabcef838e3c50e93e6d13 (1 of 330) to
> server=hor18n37.gq1.ygridcore.net,60020,1374094975268
> ...
> 13/07/17 21:54:20 INFO region_mover: Moving region
> d00026d7cc396bb3e6ea91106cc6ab55 (329 of 330) to
> server=hor18n37.gq1.ygridcore.net,60020,1374094975268
> 13/07/17 21:54:20 INFO region_mover: Moving region
> a722179b33e6ece8c9cee3fba3056acd (330 of 330) to
> server=hor17n37.gq1.ygridcore.net,60020,1374094975264
> 13/07/17 21:54:21 INFO region_mover: Wrote list of moved regions to
> /tmp/hor18n39.gq1.ygridcore.net
> Unloaded hor18n39.gq1.ygridcore.net region(s)
> hor18n35.gq1.ygridcore.net: stopping regionserver.
> hor17n39.gq1.ygridcore.net: stopping regionserver.
> hor18n36.gq1.ygridcore.net: stopping regionserver.
> hor17n37.gq1.ygridcore.net: stopping regionserver.
> hor17n34.gq1.ygridcore.net: stopping regionserver.
> hor18n38.gq1.ygridcore.net: stopping regionserver.
> hor18n37.gq1.ygridcore.net: stopping regionserver.
> hor17n36.gq1.ygridcore.net: stopping regionserver.
> hor18n39.gq1.ygridcore.net: stopping regionserver.
> hor18n36.gq1.ygridcore.net: starting regionserver, logging to
> /grid/0/var/log/hbase/hbase-hbase-regionserver-hor18n36.gq1.ygridcore.net.out
> hor17n36.gq1.ygridcore.net: starting regionserver, logging to
> /grid/0/var/log/hbase/hbase-hbase-regionserver-hor17n36.gq1.ygridcore.net.out
> hor17n37.gq1.ygridcore.net: starting regionserver, logging to
> /grid/0/var/log/hbase/hbase-hbase-regionserver-hor17n37.gq1.ygridcore.net.out
> hor18n37.gq1.ygridcore.net: starting regionserver, logging to
> /grid/0/var/log/hbase/hbase-hbase-regionserver-hor18n37.gq1.ygridcore.net.out
> hor18n38.gq1.ygridcore.net: starting regionserver, logging to
> /grid/0/var/log/hbase/hbase-hbase-regionserver-hor18n38.gq1.ygridcore.net.out
> hor17n34.gq1.ygridcore.net: starting regionserver, logging to
> /grid/0/var/log/hbase/hbase-hbase-regionserver-hor17n34.gq1.ygridcore.net.out
> hor18n35.gq1.ygridcore.net: starting regionserver, logging to
> /grid/0/var/log/hbase/hbase-hbase-regionserver-hor18n35.gq1.ygridcore.net.out
> hor18n39.gq1.ygridcore.net: starting regionserver, logging to
> /grid/0/var/log/hbase/hbase-hbase-regionserver-hor18n39.gq1.ygridcore.net.out
> hor17n39.gq1.ygridcore.net: starting regionserver, logging to
> /grid/0/var/log/hbase/hbase-hbase-regionserver-hor17n39.gq1.ygridcore.net.out
> Reloading hor18n39.gq1.ygridcore.net region(s)
> ...
> 13/07/17 21:54:27 INFO region_mover: Moving 330 regions to
> hor18n39.gq1.ygridcore.net,60020,1374098064602
> 13/07/17 21:56:47 INFO region_mover: Moving region
> 7d0a02f452c334a12026b45346a87d36 (1 of 330) to
> server=hor18n39.gq1.ygridcore.net,60020,1374098064602 in thread 0
> 13/07/17 21:56:54 INFO region_mover: Moving region
> af5448c90e78a8f0d935efb0b380502e (2 of 330) to
> server=hor18n39.gq1.ygridcore.net,60020,1374098064602 in thread 1
> ...
> {noformat}
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