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https://issues.apache.org/jira/browse/HDFS-12576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16188881#comment-16188881
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Bharat Viswanadham edited comment on HDFS-12576 at 10/2/17 9:34 PM:
--------------------------------------------------------------------
[~anu]
What is happening currently is
{code:java}
JOURNAL_NODES=$("${HADOOP_HDFS_HOME}/bin/hdfs" getconf -journalNodes 2>&-)
{code}
this will get an empty string with a new line, when
dfs.namenode.shared.edits.dir or dfs.namenode.shared.edits.dir.<<namespaceId>>
is not set.
*Example Output:*
{code:java}
hdfs@4abb0327cd7f:/$ /hadoop/bin/hdfs getconf -journalnodes
2017-10-02 21:30:46,563 WARN util.NativeCodeLoader: Unable to load
native-hadoop library for your platform... using builtin-java classes where
applicable
hdfs@4abb0327cd7f:/$
{code}
*Note: Internally getconf -journalnodes uses dfs.namenode.shared.edits.dir to
find list of journal nodes in the cluster.*
So, when nothing is set, the below check is passing ,
if [[ "{$JOURNAL_NODES-}" != $'\n' ]]; then
So, to avoid that checked the lenght of the returned journal nodes. If length
is greater than zero, there are journal nodes available, I need to start/stop
otherwise nothing is set, no need to start/stop journal nodes.
Pls let me know if it makes sense.
was (Author: bharatviswa):
[~anu]
What is happening currently is
JOURNAL_NODES=$("${HADOOP_HDFS_HOME}/bin/hdfs" getconf -journalNodes 2>&-)
this will get an empty string with a new line, when
dfs.namenode.shared.edits.dir or dfs.namenode.shared.edits.dir.<<namespaceId>>
is not set.
*Example Output:*
{code:java}
hdfs@4abb0327cd7f:/$ /hadoop/bin/hdfs getconf -journalnodes
2017-10-02 21:30:46,563 WARN util.NativeCodeLoader: Unable to load
native-hadoop library for your platform... using builtin-java classes where
applicable
hdfs@4abb0327cd7f:/$
{code}
*Note: Internally getconf -journalnodes uses dfs.namenode.shared.edits.dir to
find list of journal nodes in the cluster.*
So, when nothing is set, the below check is passing ,
if [[ "{$JOURNAL_NODES-}" != $'\n' ]]; then
So, to avoid that checked the lenght of the returned journal nodes. If length
is greater than zero, there are journal nodes available, I need to start/stop
otherwise nothing is set, no need to start/stop journal nodes.
Pls let me know if it makes sense.
> JournalNodes are getting started, even though dfs.namenode.shared.edits.dir
> is not configured
> ---------------------------------------------------------------------------------------------
>
> Key: HDFS-12576
> URL: https://issues.apache.org/jira/browse/HDFS-12576
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Bharat Viswanadham
> Assignee: Bharat Viswanadham
> Attachments: HDFS-12576.01.patch
>
>
> dfs.namenode.shared.edits.dir is not configured, but still journal node is
> getting started.
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