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https://issues.apache.org/jira/browse/HDFS-3224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13249008#comment-13249008
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Eli Collins commented on HDFS-3224:
-----------------------------------
Btw here was the code before HDFS-3144. Host2NodesMap was using getHost which
is the "name" w/o port
{code}
- String host = node.getHost();
+ String ipAddr = node.getIpAddr();
{code}
and DatanodeManager was doing lookups with the "name"
{code}
- DatanodeDescriptor nodeN = getDatanodeByHost(nodeReg.getName());
+ DatanodeDescriptor nodeN = getDatanodeByHost(nodeReg.getXferAddr());
{code}
> Bug in check for DN re-registration with different storage ID
> -------------------------------------------------------------
>
> Key: HDFS-3224
> URL: https://issues.apache.org/jira/browse/HDFS-3224
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Eli Collins
> Priority: Minor
>
> DatanodeManager#registerDatanode checks the host to node map using an IP:port
> key, however the map is keyed on IP, so this check will always fail. It's
> performing the check to determine if a DN with the same IP and storage ID has
> already registered, and if so to remove this DN from the map and indicate
> that eg it's no longer hosting these blocks. This bug has been here forever.
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