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Posted to issues@hawq.apache.org by "Shubham Sharma (JIRA)" <ji...@apache.org> on 2017/07/18 01:22:00 UTC
[jira] [Updated] (HAWQ-1504) Namenode hangs during restart of
docker environment configured using incubator-hawq/contrib/hawq-docker/
[ https://issues.apache.org/jira/browse/HAWQ-1504?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Shubham Sharma updated HAWQ-1504:
---------------------------------
Priority: Minor (was: Major)
> Namenode hangs during restart of docker environment configured using incubator-hawq/contrib/hawq-docker/
> --------------------------------------------------------------------------------------------------------
>
> Key: HAWQ-1504
> URL: https://issues.apache.org/jira/browse/HAWQ-1504
> Project: Apache HAWQ
> Issue Type: Bug
> Components: Command Line Tools
> Reporter: Shubham Sharma
> Assignee: Radar Lei
> Priority: Minor
>
> After setting up an environment using instructions provided under incubator-hawq/contrib/hawq-docker/, while trying to restart docker containers namenode hangs and tries a namenode -format during every start.
> Steps to reproduce this issue -
> - Navigate to incubator-hawq/contrib/hawq-docker
> - make stop
> - make start
> - docker exec -it centos7-namenode bash
> - ps -ef | grep java
> You can see namenode -format running.
> {code}
> [gpadmin@centos7-namenode data]$ ps -ef | grep java
> hdfs 11 10 1 00:56 ? 00:00:06 /etc/alternatives/java_sdk/bin/java -Dproc_namenode -Xmx1000m -Dhdfs.namenode=centos7-namenode -Dhadoop.log.dir=/var/log/hadoop/hdfs -Dhadoop.log.file=hadoop.log -Dhadoop.home.dir=/usr/hdp/2.5.0.0-1245/hadoop -Dhadoop.id.str= -Dhadoop.root.logger=INFO,console -Djava.library.path=:/usr/hdp/2.5.0.0-1245/hadoop/lib/native/Linux-amd64-64:/usr/hdp/2.5.0.0-1245/hadoop/lib/native -Dhadoop.policy.file=hadoop-policy.xml -Djava.net.preferIPv4Stack=true -Dhadoop.security.logger=INFO,NullAppender org.apache.hadoop.hdfs.server.namenode.NameNode -format
> {code}
> Since namenode -format runs in interactive mode and at this stage it is waiting for a (Yes/No) response, the namenode will remain stuck forever. This makes hdfs unavailable.
> Root cause of the problem -
> In the dockerfiles present under incubator-hawq/contrib/hawq-docker/centos6-docker/hawq-test and incubator-hawq/contrib/hawq-docker/centos7-docker/hawq-test, the docker directive ENTRYPOINT executes entrypoin.sh during startup.
> The entrypoint.sh in turn executes start-hdfs.sh. start-dfs.sh checks for the following -
> {code}
> if [ ! -d /tmp/hdfs/name/current ]; then
> su -l hdfs -c "hdfs namenode -format"
> fi
> {code}
> My assumption is it looks for fsimage and edit logs. If they are not present the script assumes that this a first time initialization and namenode format should be done. However, path /tmp/hdfs/name/current does not exist on namenode.
> From namenode logs it is clear that fsimage and edit logs are written under /tmp/hadoop-hdfs/dfs/name/current.
> {code}
> 2017-07-18 00:55:20,892 INFO org.apache.hadoop.hdfs.server.namenode.FSImage: No edit log streams selected.
> 2017-07-18 00:55:20,893 INFO org.apache.hadoop.hdfs.server.namenode.FSImage: Planning to load image: FSImageFile(file=/tmp/hadoop-hdfs/dfs/name/current/fsimage_0000000000000000000, cpktTxId=0000000000000000000)
> 2017-07-18 00:55:20,995 INFO org.apache.hadoop.hdfs.server.namenode.FSImageFormatPBINode: Loading 1 INodes.
> 2017-07-18 00:55:21,064 INFO org.apache.hadoop.hdfs.server.namenode.FSImageFormatProtobuf: Loaded FSImage in 0 seconds.
> 2017-07-18 00:55:21,065 INFO org.apache.hadoop.hdfs.server.namenode.FSImage: Loaded image for txid 0 from /tmp/hadoop-hdfs/dfs/name/current/fsimage_0000000000000000000
> 2017-07-18 00:55:21,084 INFO org.apache.hadoop.hdfs.server.namenode.FSNamesystem: Need to save fs image? false (staleImage=false, haEnabled=false, isRollingUpgrade=false)
> 2017-07-18 00:55:21,084 INFO org.apache.hadoop.hdfs.server.namenode.FSEditLog: Starting log segment at 1
> {code}
> Thus wrong path in incubator-hawq/contrib/hawq-docker/centos*-docker/hawq-test/start-hdfs.sh causes namenode to hang during each restart of the containers making hdfs unavailable.
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