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https://issues.apache.org/jira/browse/KAFKA-6084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16212280#comment-16212280
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Viktor Somogyi commented on KAFKA-6084:
---------------------------------------
[~ijuma] thank you for the positive feedback. Do you know who's the right
person to contact to get the PR reviewed? :)
> ReassignPartitionsCommand should propagate JSON parsing failures
> ----------------------------------------------------------------
>
> Key: KAFKA-6084
> URL: https://issues.apache.org/jira/browse/KAFKA-6084
> Project: Kafka
> Issue Type: Improvement
> Components: admin
> Affects Versions: 0.11.0.0
> Reporter: Viktor Somogyi
> Assignee: Viktor Somogyi
> Priority: Minor
> Labels: easyfix, newbie
> Attachments: Screen Shot 2017-10-18 at 23.31.22.png
>
>
> Basically looking at Json.scala it will always swallow any parsing errors:
> {code}
> def parseFull(input: String): Option[JsonValue] =
> try Option(mapper.readTree(input)).map(JsonValue(_))
> catch { case _: JsonProcessingException => None }
> {code}
> However sometimes it is easy to figure out the problem by simply looking at
> the JSON, in some cases it is not very trivial, such as some invisible
> characters (like byte order mark) won't be displayed by most of the text
> editors and can people spend time on figuring out what's the problem.
> As Jackson provides a really detailed exception about what failed and how, it
> is easy to propagate the failure to the user.
> As an example I attached a BOM prefixed JSON which fails with the following
> error which is very counterintuitive:
> {noformat}
> [root@localhost ~]# kafka-reassign-partitions --zookeeper localhost:2181
> --reassignment-json-file /root/increase-replication-factor.json --execute
> Partitions reassignment failed due to Partition reassignment data file
> /root/increase-replication-factor.json is empty
> kafka.common.AdminCommandFailedException: Partition reassignment data file
> /root/increase-replication-factor.json is empty
> at
> kafka.admin.ReassignPartitionsCommand$.executeAssignment(ReassignPartitionsCommand.scala:120)
> at
> kafka.admin.ReassignPartitionsCommand$.main(ReassignPartitionsCommand.scala:52)
> at kafka.admin.ReassignPartitionsCommand.main(ReassignPartitionsCommand.scala)
> ...
> {noformat}
> In case of the above error it would be much better to see what fails exactly:
> {noformat}
> kafka.common.AdminCommandFailedException: Admin command failed
> at
> kafka.admin.ReassignPartitionsCommand$.parsePartitionReassignmentData(ReassignPartitionsCommand.scala:267)
> at
> kafka.admin.ReassignPartitionsCommand$.parseAndValidate(ReassignPartitionsCommand.scala:275)
> at
> kafka.admin.ReassignPartitionsCommand$.executeAssignment(ReassignPartitionsCommand.scala:197)
> at
> kafka.admin.ReassignPartitionsCommand$.executeAssignment(ReassignPartitionsCommand.scala:193)
> at
> kafka.admin.ReassignPartitionsCommand$.main(ReassignPartitionsCommand.scala:64)
> at
> kafka.admin.ReassignPartitionsCommand.main(ReassignPartitionsCommand.scala)
> Caused by: com.fasterxml.jackson.core.JsonParseException: Unexpected
> character ('' (code 65279 / 0xfeff)): expected a valid value (number,
> String, array, object, 'true', 'false' or 'null')
> at [Source: (String)"{"version":1,
> "partitions":[
> {"topic": "test1", "partition": 0, "replicas": [1,2]},
> {"topic": "test2", "partition": 1, "replicas": [2,3]}
> ]}"; line: 1, column: 2]
> at
> com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1798)
> at
> com.fasterxml.jackson.core.base.ParserMinimalBase._reportError(ParserMinimalBase.java:663)
> at
> com.fasterxml.jackson.core.base.ParserMinimalBase._reportUnexpectedChar(ParserMinimalBase.java:561)
> at
> com.fasterxml.jackson.core.json.ReaderBasedJsonParser._handleOddValue(ReaderBasedJsonParser.java:1892)
> at
> com.fasterxml.jackson.core.json.ReaderBasedJsonParser.nextToken(ReaderBasedJsonParser.java:747)
> at
> com.fasterxml.jackson.databind.ObjectMapper._readTreeAndClose(ObjectMapper.java:4030)
> at
> com.fasterxml.jackson.databind.ObjectMapper.readTree(ObjectMapper.java:2539)
> at kafka.utils.Json$.kafka$utils$Json$$doParseFull(Json.scala:46)
> at kafka.utils.Json$$anonfun$tryParseFull$1.apply(Json.scala:44)
> at kafka.utils.Json$$anonfun$tryParseFull$1.apply(Json.scala:44)
> at scala.util.Try$.apply(Try.scala:192)
> at kafka.utils.Json$.tryParseFull(Json.scala:44)
> at
> kafka.admin.ReassignPartitionsCommand$.parsePartitionReassignmentData(ReassignPartitionsCommand.scala:241)
> ... 5 more
> {noformat}
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