Storm0.9.3启动后关于参数问题的报错

启动storm后，如果发现报错如下，或者有类似的错误提示：

Exception in thread "main" expected '<document start>', but found BlockMappingStart in 'reader', line 43, column 1:

说明参数有错误，在配置文件的43行第1列。

原因是因为storm 0.9.3（其他版本或许相同，未做考证）版本中的配置文件，必须以空格开头，即所有配置文件的开头需要是空格。

storm@h1:/opt$ Exception in thread "main" expected '<document start>', but found BlockMappingStart
 in 'reader', line 43, column 1:
    supervisor.slots.ports:
    at org.yaml.snakeyaml.parser.ParserImpl$ParseDocumentStart.produce(ParserImpl.java:225)
    at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:158)
    at org.yaml.snakeyaml.parser.ParserImpl.checkEvent(ParserImpl.java:143)
    at org.yaml.snakeyaml.composer.Composer.getSingleNode(Composer.java:108)
    at org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseConstructor.java:120)
    at org.yaml.snakeyaml.Yaml.loadFromReader(Yaml.java:481)
    at org.yaml.snakeyaml.Yaml.load(Yaml.java:424)
    at backtype.storm.utils.Utils.findAndReadConfigFile(Utils.java:138)
    at backtype.storm.utils.Utils.readStormConfig(Utils.java:178)
    at backtype.storm.config$read_storm_config.invoke(config.clj:116)
    at backtype.storm.command.config_value$_main.invoke(config_value.clj:22)
    at clojure.lang.AFn.applyToHelper(AFn.java:161)
    at clojure.lang.AFn.applyTo(AFn.java:151)
    at backtype.storm.command.config_value.main(Unknown Source)
Exception in thread "main" expected '<document start>', but found BlockMappingStart
 in 'reader', line 43, column 1:
    supervisor.slots.ports:
    ^

    at org.yaml.snakeyaml.parser.ParserImpl$ParseDocumentStart.produce(ParserImpl.java:225)
    at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:158)
    at org.yaml.snakeyaml.parser.ParserImpl.checkEvent(ParserImpl.java:143)
    at org.yaml.snakeyaml.composer.Composer.getSingleNode(Composer.java:108)
    at org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseConstructor.java:120)
    at org.yaml.snakeyaml.Yaml.loadFromReader(Yaml.java:481)
    at org.yaml.snakeyaml.Yaml.load(Yaml.java:424)
    at backtype.storm.utils.Utils.findAndReadConfigFile(Utils.java:138)
    at backtype.storm.utils.Utils.readStormConfig(Utils.java:178)
    at backtype.storm.config$read_storm_config.invoke(config.clj:116)
    at backtype.storm.command.config_value$_main.invoke(config_value.clj:22)
    at clojure.lang.AFn.applyToHelper(AFn.java:161)
    at clojure.lang.AFn.applyTo(AFn.java:151)
    at backtype.storm.command.config_value.main(Unknown Source)

在给配置文件加上空格后，问题消失，正常启动,如下：没行参数前都要空出一格。

# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

########### These MUST be filled in for a storm configuration
 storm.zookeeper.servers:
     - "h1"
     - "h2"
     - "h3"

 nimbus.host: "h1"
# 
#temporary change to 8081
 ui.port: 8080
# 
# 
# ##### These may optionally be filled in:
#    
## List of custom serializations
# topology.kryo.register:
#     - org.mycompany.MyType
#     - org.mycompany.MyType2: org.mycompany.MyType2Serializer
#
## List of custom kryo decorators
# topology.kryo.decorators:
#     - org.mycompany.MyDecorator
#
## Locations of the drpc servers
#drpc.servers:
#  - "drpc-server"
#supervisor.slots.ports:
#  - 6700
#  - 6701
#  - 6702
#  - 6703

## Metrics Consumers
# topology.metrics.consumer.register:
#   - class: "backtype.storm.metrics.LoggingMetricsConsumer"
#     parallelism.hint: 1
#   - class: "org.mycompany.MyMetricsConsumer"
#     parallelism.hint: 1
#     argument:
#       - endpoint: "metrics-collector.mycompany.org"
#storm.local.dir: "/home/storm/storm-0.9.1"
 storm.scheduler: "backtype.storm.scheduler.ResaScheduler"
 worker.childopts: "-Xmx4096m"
 supervisor.heartbeat.frequency.secs: 10
 worker.heartbeat.frequency.secs: 5
 task.heartbeat.frequency.secs: 5
 task.refresh.poll.secs: 3

 topology.receiver.buffer.size: 1
 topology.max.spout.pending: 200
 topology.executor.send.buffer.size: 65536
 topology.executor.receive.buffer.size: 65536

 worker.cpu.limit: 200

这里要给大家提个醒：在配置Storm时，最好不要改动原来的格式，你只需要在相关的地方加上你要用的东西即可。尤其是空格，多一个，少一个，系统可能都会提示识别的错误，也让人感觉到匪夷所思。