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Hudson commented on HBASE-14498: -------------------------------- SUCCESS: Integrated in Jenkins build HBase-1.2-IT #938 (See [https://builds.apache.org/job/HBase-1.2-IT/938/]) Revert "HBASE-14498 Master stuck in infinite loop when all Zookeeper (stack: rev 863c2f7be39961c0974f34e08d40383794ab95f9) * (edit) hbase-client/src/test/java/org/apache/hadoop/hbase/zookeeper/TestZooKeeperWatcher.java * (edit) hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/ZooKeeperWatcher.java * (edit) hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java > Master stuck in infinite loop when all Zookeeper servers are unreachable > ------------------------------------------------------------------------ > > Key: HBASE-14498 > URL: https://issues.apache.org/jira/browse/HBASE-14498 > Project: HBase > Issue Type: Bug > Components: master > Reporter: Y. SREENIVASULU REDDY > Assignee: Pankaj Kumar > Priority: Critical > Fix For: 2.0.0, 1.3.2, 1.4.1, 1.5.0, 1.2.7 > > Attachments: HBASE-14498-addendum.patch, > HBASE-14498-branch-1.2.patch, HBASE-14498-branch-1.3.patch, > HBASE-14498-branch-1.3-V2.patch, HBASE-14498-branch-1.4.patch, > HBASE-14498-branch-1.patch, HBASE-14498.master.001.patch, > HBASE-14498.master.002.patch, HBASE-14498.patch, HBASE-14498-V2.patch, > HBASE-14498-V3.patch, HBASE-14498-V4.patch, HBASE-14498-V5.patch, > HBASE-14498-V6.patch, HBASE-14498-V6.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. -- This message was sent by Atlassian JIRA (v6.4.14#64029)