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From "Luigi Di Fraia (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-4640) [zookeeper.ZooUtil] ERROR: unable obtain instance id at hdfs://master:9000/accumulo/instance_id
Date Fri, 19 May 2017 11:24:04 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-4640?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16017269#comment-16017269
] 

Luigi Di Fraia commented on ACCUMULO-4640:
------------------------------------------

Thank you Christopher. Again, I'd like to underline that with the "common" choice for volume
(i.e. "hdfs://master:9000/accumulo" assuming the namenode runs on the host "master") this
bug cannot be replicated in 1.8.1 as the shell seems to default to using it in case it cannot
find the value of instance.volumes in client.conf.

There have been a number of changes in this area since Sept 2016 (the release date for Accumulo
1.8.0). In case it helps somehow: releases 1.7.1, 1.7.2 and 1.8.0 are not affected by this
bug: effectively the shell can be started with an empty client.conf and seems to take configuration
options from accumulo-site.xml.

> [zookeeper.ZooUtil] ERROR: unable obtain instance id at hdfs://master:9000/accumulo/instance_id
> -----------------------------------------------------------------------------------------------
>
>                 Key: ACCUMULO-4640
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4640
>             Project: Accumulo
>          Issue Type: Bug
>          Components: shell
>    Affects Versions: 1.8.1
>         Environment: [accumulo@master ~]$ cat /etc/redhat-release
> CentOS Linux release 7.3.1611 (Core)
> [accumulo@master ~]$ uname -a
> Linux master 3.10.0-514.10.2.el7.x86_64 #1 SMP Fri Mar 3 00:04:05 UTC 2017 x86_64 x86_64
x86_64 GNU/Linux
> [accumulo@master ~]$ java -version
> java version "1.8.0_112"
> Java(TM) SE Runtime Environment (build 1.8.0_112-b15)
> Java HotSpot(TM) 64-Bit Server VM (build 25.112-b15, mixed mode)
> Hadoop: 2.8.0
> ZooKeeper: 3.4.10
> Accumulo: 1.8.1
>            Reporter: Luigi Di Fraia
>             Fix For: 1.8.2, 2.0.0
>
>         Attachments: accumulo-env.sh, accumulo-site.xml
>
>
> Starting with Accumulo 1.8.1 we are getting the exception as per below when the Accumulo
shell is invoked:
> [accumulo@master ~]$ /usr/local/accumulo/bin/accumulo shell -u root -p ***removed***
> 2017-05-18 14:31:23,667 [zookeeper.ZooUtil] ERROR: unable obtain instance id at hdfs://master:9000/accumulo/instance_id
> 2017-05-18 14:31:23,669 [start.Main] ERROR: Thread 'shell' died.
> java.lang.RuntimeException: Accumulo not initialized, there is no instance id at hdfs://master:9000/accumulo/instance_id
>         at org.apache.accumulo.core.zookeeper.ZooUtil.getInstanceIDFromHdfs(ZooUtil.java:66)
>         at org.apache.accumulo.core.zookeeper.ZooUtil.getInstanceIDFromHdfs(ZooUtil.java:51)
>         at org.apache.accumulo.shell.Shell.getZooInstance(Shell.java:511)
>         at org.apache.accumulo.shell.Shell.setInstance(Shell.java:473)
>         at org.apache.accumulo.shell.Shell.config(Shell.java:322)
>         at org.apache.accumulo.shell.Shell.execute(Shell.java:589)
>         at org.apache.accumulo.start.Main$1.run(Main.java:120)
>         at java.lang.Thread.run(Thread.java:745)
> The location used to look up the instance_id (hdfs://master:9000/accumulo/instance_id)
does not appear to be consistent with this site configuration and I am not quite sure how
it is being worked out.
> The Accumulo Overview web page shows that the instance exists:
> Instance ID: 4264f11a-704f-4c1f-880f-08f6154232b2 
> Thu May 18 14:44:03 BST 2017
> The instance_id file is in Hadoop's HDFS:
> [accumulo@master ~]$ /usr/local/hadoop/bin/hdfs dfs -ls /user/accumulo/accumulo/instance_id
> Found 1 items
> -rw-r--r--   3 accumulo supergroup          0 2017-05-18 14:27 /user/accumulo/accumulo/instance_id/4264f11a-704f-4c1f-880f-08f6154232b2
> Again, within the same environment as selected above apart for using Accumulo 1.8.0,
the shell can be invoked without issues.
> Here's a snippet from accumulo-site.xml:
>   <property>
>     <name>instance.volumes</name>
>     <value>hdfs://master:9000/user/accumulo/accumulo</value>
>     <description>comma separated list of URIs for volumes. example: hdfs://localhost:9000/accumulo</description>
>   </property>
> For historical reasons our "root volume" is not / but /user/accumulo although the above
stack trace suggests that / is being used as root volume.



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