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https://issues.apache.org/jira/browse/HBASE-14498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18017247#comment-18017247
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Duo Zhang commented on HBASE-14498:
-----------------------------------
Moved out to 4.0.0-alpha-1 first, but I think we still have this problem in the
current code base. The key problem here is that we will only recreate the
master stub when there is an exception calling master at region server side, so
if the current active master does not quit, region servers will not know the
master has changed.
I think a possible way to fix this is to force refresh the master stub at
region server side when there is a master address change in
MasterAddressTracker.
WDYT [~pankaj2461]?
Thanks.
> Master stuck in infinite loop when all Zookeeper servers are unreachable (and
> RS may run after losing its znode)
> ----------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-14498
> URL: https://issues.apache.org/jira/browse/HBASE-14498
> Project: HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 3.0.0-alpha-1, 1.5.0, 2.0.0, 2.2.0
> Reporter: Y. SREENIVASULU REDDY
> Assignee: Pankaj Kumar
> Priority: Blocker
> Fix For: 4.0.0-alpha-1
>
> Attachments: HBASE-14498-V2.patch, HBASE-14498-V3.patch,
> HBASE-14498-V4.patch, HBASE-14498-V5.patch, HBASE-14498-V6.patch,
> HBASE-14498-V6.patch, HBASE-14498-addendum.patch,
> HBASE-14498-branch-1.2.patch, HBASE-14498-branch-1.3-V2.patch,
> HBASE-14498-branch-1.3.patch, HBASE-14498-branch-1.4.patch,
> HBASE-14498-branch-1.patch, HBASE-14498.007.patch, HBASE-14498.008.patch,
> HBASE-14498.009.patch, HBASE-14498.009.patch, HBASE-14498.master.001.patch,
> HBASE-14498.master.002.patch, HBASE-14498.patch
>
>
> We met a weird scenario in our production environment.
> In a HA cluster,
> > Active Master (HM1) is not able to connect to any Zookeeper server (due to
> > N/w breakdown on master machine network with Zookeeper servers).
> {code}
> 2015-09-26 15:24:47,508 INFO
> [HM1-Host:16000.activeMasterManager-SendThread(ZK-Host:2181)]
> zookeeper.ClientCnxn: Client session timed out, have not heard from server in
> 33463ms for sessionid 0x104576b8dda0002, closing socket connection and
> attempting reconnect
> 2015-09-26 15:24:47,877 INFO
> [HM1-Host:16000.activeMasterManager-SendThread(ZK-Host1:2181)]
> client.FourLetterWordMain: connecting to ZK-Host1 2181
> 2015-09-26 15:24:48,236 INFO [main-SendThread(ZK-Host1:2181)]
> client.FourLetterWordMain: connecting to ZK-Host1 2181
> 2015-09-26 15:24:49,879 WARN
> [HM1-Host:16000.activeMasterManager-SendThread(ZK-Host1:2181)]
> zookeeper.ClientCnxn: Can not get the principle name from server ZK-Host1
> 2015-09-26 15:24:49,879 INFO
> [HM1-Host:16000.activeMasterManager-SendThread(ZK-Host1:2181)]
> zookeeper.ClientCnxn: Opening socket connection to server
> ZK-Host1/ZK-IP1:2181. Will not attempt to authenticate using SASL (unknown
> error)
> 2015-09-26 15:24:50,238 WARN [main-SendThread(ZK-Host1:2181)]
> zookeeper.ClientCnxn: Can not get the principle name from server ZK-Host1
> 2015-09-26 15:24:50,238 INFO [main-SendThread(ZK-Host1:2181)]
> zookeeper.ClientCnxn: Opening socket connection to server
> ZK-Host1/ZK-Host1:2181. Will not attempt to authenticate using SASL (unknown
> error)
> 2015-09-26 15:25:17,470 INFO [main-SendThread(ZK-Host1:2181)]
> zookeeper.ClientCnxn: Client session timed out, have not heard from server in
> 30023ms for sessionid 0x2045762cc710006, closing socket connection and
> attempting reconnect
> 2015-09-26 15:25:17,571 WARN [master/HM1-Host/HM1-IP:16000]
> zookeeper.RecoverableZooKeeper: Possibly transient ZooKeeper,
> quorum=ZK-Host:2181,ZK-Host1:2181,ZK-Host2:2181,
> exception=org.apache.zookeeper.KeeperException$ConnectionLossException:
> KeeperErrorCode = ConnectionLoss for /hbase/master
> 2015-09-26 15:25:17,872 INFO [main-SendThread(ZK-Host:2181)]
> client.FourLetterWordMain: connecting to ZK-Host 2181
> 2015-09-26 15:25:19,874 WARN [main-SendThread(ZK-Host:2181)]
> zookeeper.ClientCnxn: Can not get the principle name from server ZK-Host
> 2015-09-26 15:25:19,874 INFO [main-SendThread(ZK-Host:2181)]
> zookeeper.ClientCnxn: Opening socket connection to server ZK-Host/ZK-IP:2181.
> Will not attempt to authenticate using SASL (unknown error)
> {code}
> > Since HM1 was not able to connect to any ZK, so session timeout didnt
> > happen at Zookeeper server side and HM1 didnt abort.
> > On Zookeeper session timeout standby master (HM2) registered himself as an
> > active master.
> > HM2 is keep on waiting for region server to report him as part of active
> > master intialization.
> {noformat}
> 2015-09-26 15:24:44,928 | INFO | HM2-Host:21300.activeMasterManager | Waiting
> for region servers count to settle; currently checked in 0, slept for 0 ms,
> expecting minimum of 1, maximum of 2147483647, timeout of 4500 ms, interval
> of 1500 ms. |
> org.apache.hadoop.hbase.master.ServerManager.waitForRegionServers(ServerManager.java:1011)
> ---
> ---
> 2015-09-26 15:32:50,841 | INFO | HM2-Host:21300.activeMasterManager | Waiting
> for region servers count to settle; currently checked in 0, slept for 483913
> ms, expecting minimum of 1, maximum of 2147483647, timeout of 4500 ms,
> interval of 1500 ms. |
> org.apache.hadoop.hbase.master.ServerManager.waitForRegionServers(ServerManager.java:1011)
> {noformat}
> > At other end, region servers are reporting to HM1 on 3 sec interval. Here
> > region server retrieve master location from zookeeper only when they
> > couldn't connect to Master (ServiceException).
> Region Server will not report HM2 as per current design until unless HM1
> abort,so HM2 will exit(InitializationMonitor) and again wait for region
> servers in loop.
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