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https://issues.apache.org/jira/browse/HDFS-1623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14604495#comment-14604495
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Jian Fang commented on HDFS-1623:
---------------------------------
Sorry for commenting on the resolved JIRA. I tried to run command
hdfs dfsadmin -refreshNamenodes datanode-host:port
to refresh name nodes on data nodes after I replaced one name node with a new
one so that I don't need to restart the data nodes. However, I got the
following error:
refreshNamenodes: HA does not currently support adding a new standby to a
running DN. Please do a rolling restart of DNs to reconfigure the list of NNs.
I checked the 2.6.0 code and the error was thrown by the following code
snippet, which led me to this JIRA.
void refreshNNList(ArrayList<InetSocketAddress> addrs) throws IOException {
Set<InetSocketAddress> oldAddrs = Sets.newHashSet();
for (BPServiceActor actor : bpServices) {
oldAddrs.add(actor.getNNSocketAddress());
}
Set<InetSocketAddress> newAddrs = Sets.newHashSet(addrs);
if (!Sets.symmetricDifference(oldAddrs, newAddrs).isEmpty()) {
// Keep things simple for now -- we can implement this at a later date.
throw new IOException(
"HA does not currently support adding a new standby to a running DN.
" +
"Please do a rolling restart of DNs to reconfigure the list of NNs.");
}
}
Looks like this JIRA should not be closed and there are some uncompleted work
here. Is there any other JIRA to track this issue and how could I workaround
this problem?
Thanks in advance.
> High Availability Framework for HDFS NN
> ---------------------------------------
>
> Key: HDFS-1623
> URL: https://issues.apache.org/jira/browse/HDFS-1623
> Project: Hadoop HDFS
> Issue Type: New Feature
> Reporter: Sanjay Radia
> Fix For: 2.0.0-alpha
>
> Attachments: HA-tests.pdf, HDFS-1623.rel23.patch,
> HDFS-1623.trunk.patch, HDFS-High-Availability.pdf, NameNode HA_v2.pdf,
> NameNode HA_v2_1.pdf, Namenode HA Framework.pdf, dfsio-results.tsv,
> ha-testplan.pdf, ha-testplan.tex
>
>
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