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https://issues.apache.org/jira/browse/WHIRR-656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13457074#comment-13457074
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Steve Loughran commented on WHIRR-656:
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The install process can deadlock in directory creation
Conditions:
#there already exists a preformatted FS
#the only DN coming up is on the same machine
In this scenario,
# the {{start_namenode()}} function can block as dfsadmin waits to come out of
safemode,
# NN will only do that once the block count is high enough
# the DN isn't started until the NN is started
# result: deadlock
Fix: don't create the dir structure if the FS was already there.
> HDFS directory creation can deadlock if the cluster being brought up is
> single node & preformatted
> ---------------------------------------------------------------------------------------------------
>
> Key: WHIRR-656
> URL: https://issues.apache.org/jira/browse/WHIRR-656
> Project: Whirr
> Issue Type: Bug
> Components: service/hadoop
> Affects Versions: 0.9.0
> Reporter: Steve Loughran
> Priority: Minor
>
> If you have a single node cluster & there already exists a pre-formatted
> filesystem then the cluster config process can deadlock in dfs directory
> creation
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