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https://issues.apache.org/jira/browse/HDFS-12473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16172176#comment-16172176
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Manoj Govindassamy commented on HDFS-12473:
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[~mingma], Thanks for handling the upgrade case. LGTM, +1, few nits below.
1. {{CombinedHostsFileReader.java}}
* line 71: The patch is handling JsonMappingException. Spec says #readValue
using a stream can also throw JsonParseException. Any needs/use in handling
both? I am ok even otherwise.
* line 72: typo in "Fore backward" -> "For backward"
2. {{CombinedHostsFileWriter.java}}
* line 42: json hosts file sample doesn't have "," separating the entries.
> 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, HDFS-12473.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": "112233"}
> {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": "112233"}
> ]
> {noformat}
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