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https://issues.apache.org/jira/browse/HDFS-16508?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17508488#comment-17508488
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tomscut commented on HDFS-16508:
--------------------------------
Hi [~willtoshare] , please see HDFS-15509, HDFS-8277 and HDFS-16505. It seems
to be the same kind of problem,
> When the nn1 fails at very beginning, admin command that waits exist safe
> mode fails
> ------------------------------------------------------------------------------------
>
> Key: HDFS-16508
> URL: https://issues.apache.org/jira/browse/HDFS-16508
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: tools
> Affects Versions: 3.3.1
> Reporter: May
> Priority: Major
>
> The HA is enabled, and we have two NameNodes: nn1 and nn2.
> When starting the cluster, the nn1 fails at the very beginning, and nn2
> transfers to active state. The culster can provide services normally.
> However, when we tried to get safe mode or wait exit safe mode, our dfsadmin
> command fails due to an IOException: cannot connect to nn1.
> The *root cause* seems locate in here:
> {code:java}
> //DFSAdmin.class
> public void setSafeMode(String[] argv, int idx) throws IOException {
> …
> if (isHaEnabled) {
> String nsId = dfsUri.getHost();
> List<ProxyAndInfo<ClientProtocol>> proxies =
> HAUtil.getProxiesForAllNameNodesInNameservice(
> dfsConf, nsId, ClientProtocol.class);
> for (ProxyAndInfo<ClientProtocol> proxy : proxies) {
> ClientProtocol haNn = proxy.getProxy();
> //The code always queries from the first nn, i.e., nn1, and returns
> with IOException when nn1 fails.
> boolean inSafeMode = haNn.setSafeMode(action, false);
> if (waitExitSafe) {
> inSafeMode = waitExitSafeMode(haNn, inSafeMode);
> }
> System.out.println("Safe mode is " + (inSafeMode ? "ON" : "OFF")
> + " in " + proxy.getAddress());
> }
> }
> …
> }
> {code}
> Actually, I'm curious that do we need to get/wait every namenode here when HA
> is enabled?
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