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https://issues.apache.org/jira/browse/HDFS-11296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15804033#comment-15804033
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Manoj Govindassamy edited comment on HDFS-11296 at 1/6/17 8:50 AM:
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Thanks for the review [~eddyxu].
This configuration is needed only in the Active NameNode. The user has to
configure the expiry time of a DN in *absolute epoch time* in the combined
hosts file. For example, user can get the absolute epoch time for 1hr expiry by
running the following shell command on the NameNode.
{code}
# echo $(((`date +%s` + 60*60) * 1000))
1483696115000
{code}
was (Author: manojg):
Thanks for the review [~eddyxu].
This configuration is needed only in the Active NameNode. The user has to
configure the expiry time of a DN in *absolute epoch time* in the combined
hosts file. For example, user can get the absolute epoch time for 1hr expiry by
running the following shell command on the NameNode.
# echo $(((`date +%s` + 60*60) * 1000))
1483696115000
> Maintenance state expiry should be an epoch time and not jvm monotonic
> ----------------------------------------------------------------------
>
> Key: HDFS-11296
> URL: https://issues.apache.org/jira/browse/HDFS-11296
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Affects Versions: 3.0.0-alpha1
> Reporter: Manoj Govindassamy
> Assignee: Manoj Govindassamy
> Attachments: HDFS-11296.01.patch
>
>
> Currently it is possible to configure an expiry time in milliseconds for a
> DataNode in maintenance state. As per the design, the expiry attribute is an
> absolute time, beyond which NameNode starts to stop the ongoing maintenance
> operation for that DataNode. Internally in the code, this expiry time is read
> and checked against {{Time.monotonicNow()}} making the expiry based on more
> of JVM's runtime, which is very difficult to configure for any external user.
> The goal is to make the expiry time an absolute epoch time, so that its easy
> to configure for external users.
> {noformat}
> {
> "hostName": <host>,
> "port": <port>,
> "adminState": "IN_MAINTENANCE",
> "maintenanceExpireTimeInMS": <time in millis>
> }
> {noformat}
> DatanodeInfo.java
> {noformat}
> public static boolean maintenanceNotExpired(long maintenanceExpireTimeInMS)
> {
> return Time.monotonicNow() < maintenanceExpireTimeInMS;
> }
> {noformat}
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