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From "Manoj Govindassamy (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12473) Change hosts JSON file format
Date Mon, 18 Sep 2017 18:58:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16170493#comment-16170493

Manoj Govindassamy commented on HDFS-12473:

  Thanks for the patch revisions. On of our minor releases recently shipped with support for
Maintenance state and it uses the older hosts json format just like in the upstream. Internally
we had a question on the non-standard json format in the hosts file, but we didn't want to
diverge from the upstream code. Now that we are fixing the hosts file json format, an upgrade
handling for people like us will be very helpful. You think otherwise, given that upstream
releases doesn't have this issue?

> Change hosts JSON file format
> -----------------------------
>                 Key: HDFS-12473
>                 URL: https://issues.apache.org/jira/browse/HDFS-12473
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Ming Ma
>            Assignee: Ming Ma
>         Attachments: HDFS-12473-2.patch, HDFS-12473-3.patch, HDFS-12473-4.patch, HDFS-12473-5.patch,
> The existing host JSON file format doesn't have a top-level token.
> {noformat}
>   {"hostName": "host1"}
>   {"hostName": "host2", "upgradeDomain": "ud0"}
>   {"hostName": "host3", "adminState": "DECOMMISSIONED"}
>   {"hostName": "host4", "upgradeDomain": "ud2", "adminState": "DECOMMISSIONED"}
>   {"hostName": "host5", "port": 8090}
>   {"hostName": "host6", "adminState": "IN_MAINTENANCE"}
>   {"hostName": "host7", "adminState": "IN_MAINTENANCE", "maintenanceExpireTimeInMS":
> {noformat}
> Instead, to conform with the JSON standard it should be like
> {noformat}
> [
>   {"hostName": "host1"},
>   {"hostName": "host2", "upgradeDomain": "ud0"},
>   {"hostName": "host3", "adminState": "DECOMMISSIONED"},
>   {"hostName": "host4", "upgradeDomain": "ud2", "adminState": "DECOMMISSIONED"},
>   {"hostName": "host5", "port": 8090},
>   {"hostName": "host6", "adminState": "IN_MAINTENANCE"},
>   {"hostName": "host7", "adminState": "IN_MAINTENANCE", "maintenanceExpireTimeInMS":
> ]
> {noformat}

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