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From Colin Kincaid Williams <disc...@uw.edu>
Subject Re: Juggling or swaping out the standby NameNode in a QJM / HA configuration
Date Fri, 01 Aug 2014 00:56:08 GMT
On  3) Run hdfs zkfc -formatZK in my test environment, I get a Warning then
an error

WARNING: Before proceeding, ensure that all HDFS services and
failover controllers are stopped!


the complete output:

sudo hdfs zkfc -formatZK
2014-07-31 17:43:07,952 INFO  [main] tools.DFSZKFailoverController
(DFSZKFailoverController.java:<init>(140)) - Failover controller configured
for NameNode NameNode at rhel1.local/10.120.5.203:8020
2014-07-31 17:43:08,128 INFO  [main] zookeeper.ZooKeeper
(Environment.java:logEnv(100)) - Client
environment:zookeeper.version=3.4.3-cdh4.1.3--1, built on 01/27/2013 00:13
GMT
2014-07-31 17:43:08,129 INFO  [main] zookeeper.ZooKeeper
(Environment.java:logEnv(100)) - Client environment:host.name=rhel1.local
2014-07-31 17:43:08,129 INFO  [main] zookeeper.ZooKeeper
(Environment.java:logEnv(100)) - Client environment:java.version=1.7.0_60
2014-07-31 17:43:08,129 INFO  [main] zookeeper.ZooKeeper
(Environment.java:logEnv(100)) - Client environment:java.vendor=Oracle
Corporation
2014-07-31 17:43:08,129 INFO  [main] zookeeper.ZooKeeper
(Environment.java:logEnv(100)) - Client
environment:java.home=/usr/java/jdk1.7.0_60/jre
2014-07-31 17:43:08,129 INFO  [main] zookeeper.ZooKeeper
(Environment.java:logEnv(100)) - Client
environment:java.class.path=/etc/hadoop/conf:/usr/lib/hadoop/lib/jersey-core-1.8.jar:/usr/lib/hadoop/lib/commons-cli-1.2.jar:/usr/lib/hadoop/lib/jaxb-impl-2.2.3-1.jar:/usr/lib/hadoop/lib/jackson-mapper-asl-1.8.8.jar:/usr/lib/hadoop/lib/jsch-0.1.42.jar:/usr/lib/hadoop/lib/asm-3.2.jar:/usr/lib/hadoop/lib/kfs-0.3.jar:/usr/lib/hadoop/lib/jsr305-1.3.9.jar:/usr/lib/hadoop/lib/commons-logging-1.1.1.jar:/usr/lib/hadoop/lib/jets3t-0.6.1.jar:/usr/lib/hadoop/lib/xmlenc-0.52.jar:/usr/lib/hadoop/lib/jetty-6.1.26.cloudera.2.jar:/usr/lib/hadoop/lib/jsp-api-2.1.jar:/usr/lib/hadoop/lib/commons-collections-3.2.1.jar:/usr/lib/hadoop/lib/jackson-core-asl-1.8.8.jar:/usr/lib/hadoop/lib/guava-11.0.2.jar:/usr/lib/hadoop/lib/zookeeper-3.4.3-cdh4.1.3.jar:/usr/lib/hadoop/lib/servlet-api-2.5.jar:/usr/lib/hadoop/lib/log4j-1.2.17.jar:/usr/lib/hadoop/lib/avro-1.7.1.cloudera.2.jar:/usr/lib/hadoop/lib/jersey-server-1.8.jar:/usr/lib/hadoop/lib/jasper-compiler-5.5.23.jar:/usr/lib/hadoop/lib/jackson-jaxrs-1.8.8.jar:/usr/lib/hadoop/lib/jline-0.9.94.jar:/usr/lib/hadoop/lib/commons-el-1.0.jar:/usr/lib/hadoop/lib/commons-io-2.1.jar:/usr/lib/hadoop/lib/commons-configuration-1.6.jar:/usr/lib/hadoop/lib/commons-net-3.1.jar:/usr/lib/hadoop/lib/jackson-xc-1.8.8.jar:/usr/lib/hadoop/lib/jasper-runtime-5.5.23.jar:/usr/lib/hadoop/lib/commons-digester-1.8.jar:/usr/lib/hadoop/lib/slf4j-api-1.6.1.jar:/usr/lib/hadoop/lib/commons-beanutils-core-1.8.0.jar:/usr/lib/hadoop/lib/commons-httpclient-3.1.jar:/usr/lib/hadoop/lib/activation-1.1.jar:/usr/lib/hadoop/lib/jetty-util-6.1.26.cloudera.2.jar:/usr/lib/hadoop/lib/commons-beanutils-1.7.0.jar:/usr/lib/hadoop/lib/commons-lang-2.5.jar:/usr/lib/hadoop/lib/snappy-java-1.0.4.1.jar:/usr/lib/hadoop/lib/junit-4.8.2.jar:/usr/lib/hadoop/lib/stax-api-1.0.1.jar:/usr/lib/hadoop/lib/commons-math-2.1.jar:/usr/lib/hadoop/lib/mockito-all-1.8.5.jar:/usr/lib/hadoop/lib/jettison-1.1.jar:/usr/lib/hadoop/lib/jaxb-api-2.2.2.jar:/usr/lib/hadoop/lib/paranamer-2.3.jar:/usr/lib/hadoop/lib/protobuf-java-2.4.0a.jar:/usr/lib/hadoop/lib/jersey-json-1.8.jar:/usr/lib/hadoop/lib/slf4j-log4j12-1.6.1.jar:/usr/lib/hadoop/lib/commons-codec-1.4.jar:/usr/lib/hadoop/.//hadoop-annotations-2.0.0-cdh4.1.3.jar:/usr/lib/hadoop/.//hadoop-common.jar:/usr/lib/hadoop/.//hadoop-common-2.0.0-cdh4.1.3-tests.jar:/usr/lib/hadoop/.//hadoop-common-2.0.0-cdh4.1.3.jar:/usr/lib/hadoop/.//hadoop-annotations.jar:/usr/lib/hadoop/.//hadoop-auth-2.0.0-cdh4.1.3.jar:/usr/lib/hadoop/.//hadoop-auth.jar:/usr/lib/hadoop-hdfs/./:/usr/lib/hadoop-hdfs/lib/jersey-core-1.8.jar:/usr/lib/hadoop-hdfs/lib/commons-cli-1.2.jar:/usr/lib/hadoop-hdfs/lib/jackson-mapper-asl-1.8.8.jar:/usr/lib/hadoop-hdfs/lib/asm-3.2.jar:/usr/lib/hadoop-hdfs/lib/jsr305-1.3.9.jar:/usr/lib/hadoop-hdfs/lib/commons-logging-1.1.1.jar:/usr/lib/hadoop-hdfs/lib/xmlenc-0.52.jar:/usr/lib/hadoop-hdfs/lib/jetty-6.1.26.cloudera.2.jar:/usr/lib/hadoop-hdfs/lib/jsp-api-2.1.jar:/usr/lib/hadoop-hdfs/lib/jackson-core-asl-1.8.8.jar:/usr/lib/hadoop-hdfs/lib/guava-11.0.2.jar:/usr/lib/hadoop-hdfs/lib/zookeeper-3.4.3-cdh4.1.3.jar:/usr/lib/hadoop-hdfs/lib/servlet-api-2.5.jar:/usr/lib/hadoop-hdfs/lib/log4j-1.2.17.jar:/usr/lib/hadoop-hdfs/lib/jersey-server-1.8.jar:/usr/lib/hadoop-hdfs/lib/jline-0.9.94.jar:/usr/lib/hadoop-hdfs/lib/commons-el-1.0.jar:/usr/lib/hadoop-hdfs/lib/commons-io-2.1.jar:/usr/lib/hadoop-hdfs/lib/commons-daemon-1.0.3.jar:/usr/lib/hadoop-hdfs/lib/jasper-runtime-5.5.23.jar:/usr/lib/hadoop-hdfs/lib/jetty-util-6.1.26.cloudera.2.jar:/usr/lib/hadoop-hdfs/lib/commons-lang-2.5.jar:/usr/lib/hadoop-hdfs/lib/protobuf-java-2.4.0a.jar:/usr/lib/hadoop-hdfs/lib/commons-codec-1.4.jar:/usr/lib/hadoop-hdfs/.//hadoop-hdfs-2.0.0-cdh4.1.3.jar:/usr/lib/hadoop-hdfs/.//hadoop-hdfs-2.0.0-cdh4.1.3-tests.jar:/usr/lib/hadoop-hdfs/.//hadoop-hdfs.jar:/usr/lib/hadoop-yarn/lib/jersey-core-1.8.jar:/usr/lib/hadoop-yarn/lib/jackson-mapper-asl-1.8.8.jar:/usr/lib/hadoop-yarn/lib/asm-3.2.jar:/usr/lib/hadoop-yarn/lib/netty-3.2.4.Final.jar:/usr/lib/hadoop-yarn/lib/jackson-core-asl-1.8.8.jar:/usr/lib/hadoop-yarn/lib/jersey-guice-1.8.jar:/usr/lib/hadoop-yarn/lib/log4j-1.2.17.jar:/usr/lib/hadoop-yarn/lib/avro-1.7.1.cloudera.2.jar:/usr/lib/hadoop-yarn/lib/jersey-server-1.8.jar:/usr/lib/hadoop-yarn/lib/guice-3.0.jar:/usr/lib/hadoop-yarn/lib/commons-io-2.1.jar:/usr/lib/hadoop-yarn/lib/aopalliance-1.0.jar:/usr/lib/hadoop-yarn/lib/javax.inject-1.jar:/usr/lib/hadoop-yarn/lib/snappy-java-1.0.4.1.jar:/usr/lib/hadoop-yarn/lib/guice-servlet-3.0.jar:/usr/lib/hadoop-yarn/lib/paranamer-2.3.jar:/usr/lib/hadoop-yarn/lib/protobuf-java-2.4.0a.jar:/usr/lib/hadoop-yarn/.//hadoop-yarn-applications-distributedshell.jar:/usr/lib/hadoop-yarn/.//hadoop-yarn-api-2.0.0-cdh4.1.3.jar:/usr/lib/hadoop-yarn/.//hadoop-yarn-site-2.0.0-cdh4.1.3.jar:/usr/lib/hadoop-yarn/.//hadoop-yarn-common-2.0.0-cdh4.1.3.jar:/usr/lib/hadoop-yarn/.//hadoop-yarn-api.jar:/usr/lib/hadoop-yarn/.//hadoop-yarn-site.jar:/usr/lib/hadoop-yarn/.//hadoop-yarn-server-nodemanager.jar:/usr/lib/hadoop-yarn/.//hadoop-yarn-server-tests.jar:/usr/lib/hadoop-yarn/.//hadoop-yarn-server-tests-2.0.0-cdh4.1.3.jar:/usr/lib/hadoop-yarn/.//hadoop-yarn-server-common.jar:/usr/lib/hadoop-yarn/.//hadoop-yarn-applications-distributedshell-2.0.0-cdh4.1.3.jar:/usr/lib/hadoop-yarn/.//hadoop-yarn-server-web-proxy-2.0.0-cdh4.1.3.jar:/usr/lib/hadoop-yarn/.//hadoop-yarn-server-tests-2.0.0-cdh4.1.3-tests.jar:/usr/lib/hadoop-yarn/.//hadoop-yarn-server-resourcemanager.jar:/usr/lib/hadoop-yarn/.//hadoop-yarn-server-web-proxy.jar:/usr/lib/hadoop-yarn/.//hadoop-yarn-server-resourcemanager-2.0.0-cdh4.1.3.jar:/usr/lib/hadoop-yarn/.//hadoop-yarn-server-common-2.0.0-cdh4.1.3.jar:/usr/lib/hadoop-yarn/.//hadoop-yarn-server-nodemanager-2.0.0-cdh4.1.3.jar:/usr/lib/hadoop-yarn/.//hadoop-yarn-common.jar:/usr/lib/hadoop-0.20-mapreduce/./:/usr/lib/hadoop-0.20-mapreduce/lib/jersey-core-1.8.jar:/usr/lib/hadoop-0.20-mapreduce/lib/ant-contrib-1.0b3.jar:/usr/lib/hadoop-0.20-mapreduce/lib/commons-cli-1.2.jar:/usr/lib/hadoop-0.20-mapreduce/lib/aspectjrt-1.6.5.jar:/usr/lib/hadoop-0.20-mapreduce/lib/jaxb-impl-2.2.3-1.jar:/usr/lib/hadoop-0.20-mapreduce/lib/jackson-mapper-asl-1.8.8.jar:/usr/lib/hadoop-0.20-mapreduce/lib/jsch-0.1.42.jar:/usr/lib/hadoop-0.20-mapreduce/lib/asm-3.2.jar:/usr/lib/hadoop-0.20-mapreduce/lib/kfs-0.3.jar:/usr/lib/hadoop-0.20-mapreduce/lib/jsr305-1.3.9.jar:/usr/lib/hadoop-0.20-mapreduce/lib/commons-logging-1.1.1.jar:/usr/lib/hadoop-0.20-mapreduce/lib/jets3t-0.6.1.jar:/usr/lib/hadoop-0.20-mapreduce/lib/xmlenc-0.52.jar:/usr/lib/hadoop-0.20-mapreduce/lib/jetty-6.1.26.cloudera.2.jar:/usr/lib/hadoop-0.20-mapreduce/lib/jsp-api-2.1.jar:/usr/lib/hadoop-0.20-mapreduce/lib/commons-collections-3.2.1.jar:/usr/lib/hadoop-0.20-mapreduce/lib/jackson-core-asl-1.8.8.jar:/usr/lib/hadoop-0.20-mapreduce/lib/guava-11.0.2.jar:/usr/lib/hadoop-0.20-mapreduce/lib/servlet-api-2.5.jar:/usr/lib/hadoop-0.20-mapreduce/lib/log4j-1.2.17.jar:/usr/lib/hadoop-0.20-mapreduce/lib/avro-1.7.1.cloudera.2.jar:/usr/lib/hadoop-0.20-mapreduce/lib/jersey-server-1.8.jar:/usr/lib/hadoop-0.20-mapreduce/lib/jasper-compiler-5.5.23.jar:/usr/lib/hadoop-0.20-mapreduce/lib/jackson-jaxrs-1.8.8.jar:/usr/lib/hadoop-0.20-mapreduce/lib/commons-el-1.0.jar:/usr/lib/hadoop-0.20-mapreduce/lib/commons-io-2.1.jar:/usr/lib/hadoop-0.20-mapreduce/lib/commons-configuration-1.6.jar:/usr/lib/hadoop-0.20-mapreduce/lib/aspectjtools-1.6.5.jar:/usr/lib/hadoop-0.20-mapreduce/lib/commons-net-3.1.jar:/usr/lib/hadoop-0.20-mapreduce/lib/jackson-xc-1.8.8.jar:/usr/lib/hadoop-0.20-mapreduce/lib/jasper-runtime-5.5.23.jar:/usr/lib/hadoop-0.20-mapreduce/lib/commons-digester-1.8.jar:/usr/lib/hadoop-0.20-mapreduce/lib/slf4j-api-1.6.1.jar:/usr/lib/hadoop-0.20-mapreduce/lib/commons-beanutils-core-1.8.0.jar:/usr/lib/hadoop-0.20-mapreduce/lib/commons-httpclient-3.1.jar:/usr/lib/hadoop-0.20-mapreduce/lib/kfs-0.2.2.jar:/usr/lib/hadoop-0.20-mapreduce/lib/activation-1.1.jar:/usr/lib/hadoop-0.20-mapreduce/lib/jetty-util-6.1.26.cloudera.2.jar:/usr/lib/hadoop-0.20-mapreduce/lib/commons-beanutils-1.7.0.jar:/usr/lib/hadoop-0.20-mapreduce/lib/commons-lang-2.5.jar:/usr/lib/hadoop-0.20-mapreduce/lib/avro-compiler-1.7.1.cloudera.2.jar:/usr/lib/hadoop-0.20-mapreduce/lib/snappy-java-1.0.4.1.jar:/usr/lib/hadoop-0.20-mapreduce/lib/junit-4.8.2.jar:/usr/lib/hadoop-0.20-mapreduce/lib/stax-api-1.0.1.jar:/usr/lib/hadoop-0.20-mapreduce/lib/commons-math-2.1.jar:/usr/lib/hadoop-0.20-mapreduce/lib/mockito-all-1.8.5.jar:/usr/lib/hadoop-0.20-mapreduce/lib/jettison-1.1.jar:/usr/lib/hadoop-0.20-mapreduce/lib/jaxb-api-2.2.2.jar:/usr/lib/hadoop-0.20-mapreduce/lib/hsqldb-1.8.0.10.jar:/usr/lib/hadoop-0.20-mapreduce/lib/paranamer-2.3.jar:/usr/lib/hadoop-0.20-mapreduce/lib/protobuf-java-2.4.0a.jar:/usr/lib/hadoop-0.20-mapreduce/lib/jersey-json-1.8.jar:/usr/lib/hadoop-0.20-mapreduce/lib/commons-codec-1.4.jar:/usr/lib/hadoop-0.20-mapreduce/lib/hadoop-fairscheduler-2.0.0-mr1-cdh4.1.3.jar:/usr/lib/hadoop-0.20-mapreduce/.//hadoop-examples-2.0.0-mr1-cdh4.1.3.jar:/usr/lib/hadoop-0.20-mapreduce/.//hadoop-2.0.0-mr1-cdh4.1.3-ant.jar:/usr/lib/hadoop-0.20-mapreduce/.//hadoop-ant-2.0.0-mr1-cdh4.1.3.jar:/usr/lib/hadoop-0.20-mapreduce/.//hadoop-ant.jar:/usr/lib/hadoop-0.20-mapreduce/.//hadoop-2.0.0-mr1-cdh4.1.3-core.jar:/usr/lib/hadoop-0.20-mapreduce/.//hadoop-test.jar:/usr/lib/hadoop-0.20-mapreduce/.//hadoop-tools.jar:/usr/lib/hadoop-0.20-mapreduce/.//hadoop-core-2.0.0-mr1-cdh4.1.3.jar:/usr/lib/hadoop-0.20-mapreduce/.//hadoop-2.0.0-mr1-cdh4.1.3-examples.jar:/usr/lib/hadoop-0.20-mapreduce/.//hadoop-test-2.0.0-mr1-cdh4.1.3.jar:/usr/lib/hadoop-0.20-mapreduce/.//hadoop-tools-2.0.0-mr1-cdh4.1.3.jar:/usr/lib/hadoop-0.20-mapreduce/.//hadoop-examples.jar:/usr/lib/hadoop-0.20-mapreduce/.//hadoop-2.0.0-mr1-cdh4.1.3-tools.jar:/usr/lib/hadoop-0.20-mapreduce/.//hadoop-2.0.0-mr1-cdh4.1.3-test.jar:/usr/lib/hadoop-0.20-mapreduce/.//hadoop-core.jar
2014-07-31 17:43:08,130 INFO  [main] zookeeper.ZooKeeper
(Environment.java:logEnv(100)) - Client
environment:java.library.path=//usr/lib/hadoop/lib/native
2014-07-31 17:43:08,138 INFO  [main] zookeeper.ZooKeeper
(Environment.java:logEnv(100)) - Client environment:java.io.tmpdir=/tmp
2014-07-31 17:43:08,138 INFO  [main] zookeeper.ZooKeeper
(Environment.java:logEnv(100)) - Client environment:java.compiler=<NA>
2014-07-31 17:43:08,138 INFO  [main] zookeeper.ZooKeeper
(Environment.java:logEnv(100)) - Client environment:os.name=Linux
2014-07-31 17:43:08,138 INFO  [main] zookeeper.ZooKeeper
(Environment.java:logEnv(100)) - Client environment:os.arch=amd64
2014-07-31 17:43:08,138 INFO  [main] zookeeper.ZooKeeper
(Environment.java:logEnv(100)) - Client
environment:os.version=2.6.32-358.el6.x86_64
2014-07-31 17:43:08,138 INFO  [main] zookeeper.ZooKeeper
(Environment.java:logEnv(100)) - Client environment:user.name=root
2014-07-31 17:43:08,138 INFO  [main] zookeeper.ZooKeeper
(Environment.java:logEnv(100)) - Client environment:user.home=/root
2014-07-31 17:43:08,139 INFO  [main] zookeeper.ZooKeeper
(Environment.java:logEnv(100)) - Client
environment:user.dir=/etc/hbase/conf.golden_apple
2014-07-31 17:43:08,149 INFO  [main] zookeeper.ZooKeeper
(ZooKeeper.java:<init>(433)) - Initiating client connection,
connectString=rhel1.local:2181,rhel6.local:2181,rhel2.local:2181
sessionTimeout=5000 watcher=null
2014-07-31 17:43:08,170 INFO  [main-SendThread(rhel2.local:2181)]
zookeeper.ClientCnxn (ClientCnxn.java:logStartConnect(958)) - Opening
socket connection to server rhel2.local/10.120.5.25:2181. Will not attempt
to authenticate using SASL (unknown error)
2014-07-31 17:43:08,184 INFO  [main-SendThread(rhel2.local:2181)]
zookeeper.ClientCnxn (ClientCnxn.java:primeConnection(850)) - Socket
connection established to rhel2.local/10.120.5.25:2181, initiating session
2014-07-31 17:43:08,262 INFO  [main-SendThread(rhel2.local:2181)]
zookeeper.ClientCnxn (ClientCnxn.java:onConnected(1187)) - Session
establishment complete on server rhel2.local/10.120.5.25:2181, sessionid =
0x3478900fbb40019, negotiated timeout = 5000
===============================================
The configured parent znode /hadoop-ha/golden-apple already exists.
Are you sure you want to clear all failover information from
ZooKeeper?
WARNING: Before proceeding, ensure that all HDFS services and
failover controllers are stopped!
===============================================
Proceed formatting /hadoop-ha/golden-apple? (Y or N) 2014-07-31
17:43:08,268 INFO  [main-EventThread] ha.ActiveStandbyElector
(ActiveStandbyElector.java:processWatchEvent(538)) - Session connected.
Y
2014-07-31 17:43:45,025 INFO  [main] ha.ActiveStandbyElector
(ActiveStandbyElector.java:clearParentZNode(314)) - Recursively deleting
/hadoop-ha/golden-apple from ZK...
2014-07-31 17:43:45,098 ERROR [main] ha.ZKFailoverController
(ZKFailoverController.java:formatZK(266)) - Unable to clear zk parent znode
java.io.IOException: Couldn't clear parent znode /hadoop-ha/golden-apple
at
org.apache.hadoop.ha.ActiveStandbyElector.clearParentZNode(ActiveStandbyElector.java:324)
at
org.apache.hadoop.ha.ZKFailoverController.formatZK(ZKFailoverController.java:264)
at
org.apache.hadoop.ha.ZKFailoverController.doRun(ZKFailoverController.java:197)
at
org.apache.hadoop.ha.ZKFailoverController.access$000(ZKFailoverController.java:58)
at
org.apache.hadoop.ha.ZKFailoverController$1.run(ZKFailoverController.java:165)
at
org.apache.hadoop.ha.ZKFailoverController$1.run(ZKFailoverController.java:161)
at
org.apache.hadoop.security.SecurityUtil.doAsLoginUserOrFatal(SecurityUtil.java:452)
at
org.apache.hadoop.ha.ZKFailoverController.run(ZKFailoverController.java:161)
at
org.apache.hadoop.hdfs.tools.DFSZKFailoverController.main(DFSZKFailoverController.java:175)
Caused by: org.apache.zookeeper.KeeperException$NotEmptyException:
KeeperErrorCode = Directory not empty for /hadoop-ha/golden-apple
at org.apache.zookeeper.KeeperException.create(KeeperException.java:125)
at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
at org.apache.zookeeper.ZooKeeper.delete(ZooKeeper.java:868)
at org.apache.zookeeper.ZKUtil.deleteRecursive(ZKUtil.java:54)
at
org.apache.hadoop.ha.ActiveStandbyElector$1.run(ActiveStandbyElector.java:319)
at
org.apache.hadoop.ha.ActiveStandbyElector$1.run(ActiveStandbyElector.java:316)
at
org.apache.hadoop.ha.ActiveStandbyElector.zkDoWithRetries(ActiveStandbyElector.java:934)
at
org.apache.hadoop.ha.ActiveStandbyElector.clearParentZNode(ActiveStandbyElector.java:316)
... 8 more
2014-07-31 17:43:45,119 INFO  [main-EventThread] zookeeper.ClientCnxn
(ClientCnxn.java:run(511)) - EventThread shut down
2014-07-31 17:43:45,119 INFO  [main] zookeeper.ZooKeeper
(ZooKeeper.java:close(679)) - Session: 0x3478900fbb40019 closed



On Thu, Jul 31, 2014 at 1:56 PM, Colin Kincaid Williams <discord@uw.edu>
wrote:

> Thanks! I will give this a shot.
>
>
>
> On Thu, Jul 31, 2014 at 1:12 PM, Bryan Beaudreault <
> bbeaudreault@hubspot.com> wrote:
>
>> We've done this a number of times without issue.  Here's the general flow:
>>
>> 1) Shutdown namenode and zkfc on SNN
>> 2) Stop zkfc on ANN  (ANN will remain active because there is no other
>> zkfc instance running to fail over to)
>> 3) Run hdfs zkfc -formatZK on ANN
>> 4) Start zkfc on ANN (will sync up with ANN and write state to zk)
>> 5) Push new configs to the new SNN, bootstrap namenode there
>> 6) Start namenode and zkfc on SNN
>> 7) Push updated configs to all other hdfs services (datanodes, etc)
>> 8) Restart hbasemaster if you are running hbase, jobtracker for MR
>> 9) Rolling restart datanodes
>> 10) Done
>>
>> You'll have to handle any other consumers of DFSClient, like your own
>> code or other apache projects.
>>
>>
>>
>> On Thu, Jul 31, 2014 at 3:35 PM, Colin Kincaid Williams <discord@uw.edu>
>> wrote:
>>
>>> Hi Jing,
>>>
>>> Thanks for the response. I will try this out, and file an Apache jira.
>>>
>>> Best,
>>>
>>> Colin Williams
>>>
>>>
>>> On Thu, Jul 31, 2014 at 11:19 AM, Jing Zhao <jing@hortonworks.com>
>>> wrote:
>>>
>>>> Hi Colin,
>>>>
>>>>     I guess currently we may have to restart almost all the
>>>> daemons/services in order to swap out a standby NameNode (SBN):
>>>>
>>>> 1. The current active NameNode (ANN) needs to know the new SBN since in
>>>> the current implementation the SBN tries to send rollEditLog RPC request
to
>>>> ANN periodically (thus if a NN failover happens later, the original ANN
>>>> needs to send this RPC to the correct NN).
>>>> 2. Looks like the DataNode currently cannot do real refreshment for NN.
>>>> Look at the code in BPOfferService:
>>>>
>>>>   void refreshNNList(ArrayList<InetSocketAddress> addrs) throws
>>>> IOException {
>>>>     Set<InetSocketAddress> oldAddrs = Sets.newHashSet();
>>>>     for (BPServiceActor actor : bpServices) {
>>>>       oldAddrs.add(actor.getNNSocketAddress());
>>>>     }
>>>>     Set<InetSocketAddress> newAddrs = Sets.newHashSet(addrs);
>>>>
>>>>     if (!Sets.symmetricDifference(oldAddrs, newAddrs).isEmpty()) {
>>>>       // Keep things simple for now -- we can implement this at a later
>>>> date.
>>>>       throw new IOException(
>>>>           "HA does not currently support adding a new standby to a
>>>> running DN. " +
>>>>           "Please do a rolling restart of DNs to reconfigure the list
>>>> of NNs.");
>>>>     }
>>>>   }
>>>>
>>>> 3. If you're using automatic failover, you also need to update the
>>>> configuration of the ZKFC on the current ANN machine, since ZKFC will do
>>>> gracefully fencing by sending RPC to the other NN.
>>>> 4. Looks like we do not need to restart JournalNodes for the new SBN
>>>> but I have not tried before.
>>>>
>>>>     Thus in general we may still have to restart all the services
>>>> (except JNs) and update their configurations. But this may be a rolling
>>>> restart process I guess:
>>>> 1. Shutdown the old SBN, bootstrap the new SBN, and start the new SBN.
>>>> 2. Keep the ANN and its corresponding ZKFC running, do a rolling
>>>> restart of all the DN to update their configurations
>>>> 3. After restarting all the DN, stop ANN and the ZKFC, and update their
>>>> configuration. The new SBN should become active.
>>>>
>>>>     I have not tried the upper steps, thus please let me know if this
>>>> works or not. And I think we should also document the correct steps in
>>>> Apache. Could you please file an Apache jira?
>>>>
>>>> Thanks,
>>>> -Jing
>>>>
>>>>
>>>>
>>>> On Thu, Jul 31, 2014 at 9:37 AM, Colin Kincaid Williams <discord@uw.edu
>>>> > wrote:
>>>>
>>>>> Hello,
>>>>>
>>>>> I'm trying to swap out a standby NameNode in a QJM / HA configuration.
>>>>> I believe the steps to achieve this would be something similar to:
>>>>>
>>>>> Use the Bootstrap standby command to prep the replacment standby. Or
>>>>> rsync if the command fails.
>>>>>
>>>>> Somehow update the datanodes, so they push the heartbeat / journal to
>>>>> the new standby
>>>>>
>>>>> Update the xml configuration on all nodes to reflect the replacment
>>>>> standby.
>>>>>
>>>>> Start the replacment standby
>>>>>
>>>>> Use some hadoop command to refresh the datanodes to the new NameNode
>>>>> configuration.
>>>>>
>>>>> I am not sure how to deal with the Journal switch, or if I am going
>>>>> about this the right way. Can anybody give me some suggestions here?
>>>>>
>>>>>
>>>>> Regards,
>>>>>
>>>>> Colin Williams
>>>>>
>>>>>
>>>>
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>>>
>>
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