Update single text configuration using rest api

[#1]

There are many text fields in services configurations in ambari, Especially the templates configurations. I would like to know if there is a way to append text to the end of the content rather than replacing the entire thing.

I tried to extract single property so I can modify it and save it back, but "get" action does not take property key, only the type.

/var/lib/ambari-server/resources/scripts/configs.sh get localhost c1 mapred-site

I tried the following url:

/var/lib/ambari-server/resources/scripts/configs.sh get localhost c1 mapred-site "mapreduce.map.memory.mb"

But it did not work to get only that property.

So, is there a way to do an append rather than total replace?

[#2]

@Theyaa Matti

The "get" gives a JSON data that contains the complete configuration of a particular type.

But if you want to set any specific property then you can try the following using "set" with specific property.

# /var/lib/ambari-server/resources/scripts/configs.sh set erie1.example.com ErieCluster mapred-site "mapreduce.map.memory.mb" "1537"

.

Then you can login to ambari UI to see the changes. (config changes requires restart of affected services though)

[#3]

This solution is good for properties with short values, like the one you have mentioned. But, for properties that are templates, like Log4j templates, I would like to pull that modify it and upload it back to ambari.

[#4]

@Theyaa Matti

Can you please share exact example of the log4j template/property that you want to edit?

So that if we are aware of any best approach to make such modification that then we will share our findings.

[#5]

Apologies for the delay in responding. Here is an example of a log4j property.

# 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. # Define some default values that can be overridden by system properties hbase.root.logger=INFO,console hbase.security.logger=INFO,console hbase.log.dir=. hbase.log.file=hbase.log # Define the root logger to the system property "hbase.root.logger". log4j.rootLogger=${hbase.root.logger} # Logging Threshold log4j.threshold=ALL # # Daily Rolling File Appender # log4j.appender.DRFA=org.apache.log4j.DailyRollingFileAppender log4j.appender.DRFA.File=${hbase.log.dir}/${hbase.log.file} # Rollver at midnight log4j.appender.DRFA.DatePattern=.yyyy-MM-dd # 30-day backup #log4j.appender.DRFA.MaxBackupIndex=30 log4j.appender.DRFA.layout=org.apache.log4j.PatternLayout # Pattern format: Date LogLevel LoggerName LogMessage log4j.appender.DRFA.layout.ConversionPattern=%d{ISO8601} %-5p [%t] %c{2}: %m%n # Rolling File Appender properties hbase.log.maxfilesize=256MB hbase.log.maxbackupindex=20 # Rolling File Appender log4j.appender.RFA=org.apache.log4j.RollingFileAppender log4j.appender.RFA.File=${hbase.log.dir}/${hbase.log.file} log4j.appender.RFA.MaxFileSize=${hbase.log.maxfilesize} log4j.appender.RFA.MaxBackupIndex=${hbase.log.maxbackupindex} log4j.appender.RFA.layout=org.apache.log4j.PatternLayout log4j.appender.RFA.layout.ConversionPattern=%d{ISO8601} %-5p [%t] %c{2}: %m%n # # Security audit appender # hbase.security.log.file=SecurityAuth.audit hbase.security.log.maxfilesize=256MB hbase.security.log.maxbackupindex=20 log4j.appender.RFAS=org.apache.log4j.RollingFileAppender log4j.appender.RFAS.File=${hbase.log.dir}/${hbase.security.log.file} log4j.appender.RFAS.MaxFileSize=${hbase.security.log.maxfilesize} log4j.appender.RFAS.MaxBackupIndex=${hbase.security.log.maxbackupindex} log4j.appender.RFAS.layout=org.apache.log4j.PatternLayout log4j.appender.RFAS.layout.ConversionPattern=%d{ISO8601} %p %c: %m%n log4j.category.SecurityLogger=${hbase.security.logger} log4j.additivity.SecurityLogger=false #log4j.logger.SecurityLogger.org.apache.hadoop.hbase.security.access.AccessController=TRACE # # Null Appender # log4j.appender.NullAppender=org.apache.log4j.varia.NullAppender # # console # Add "console" to rootlogger above if you want to use this # log4j.appender.console=org.apache.log4j.ConsoleAppender log4j.appender.console.target=System.err log4j.appender.console.layout=org.apache.log4j.PatternLayout log4j.appender.console.layout.ConversionPattern=%d{ISO8601} %-5p [%t] %c{2}: %m%n # Custom Logging levels log4j.logger.org.apache.zookeeper=INFO #log4j.logger.org.apache.hadoop.fs.FSNamesystem=DEBUG #log4j.logger.org.apache.hadoop.hbase=DEBUG # Make these two classes INFO-level. Make them DEBUG to see more zk debug. log4j.logger.org.apache.hadoop.hbase.zookeeper.ZKUtil=INFO log4j.logger.org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher=INFO #log4j.logger.org.apache.hadoop.dfs=DEBUG # Set this class to log INFO only otherwise its OTT # Enable this to get detailed connection error/retry logging. # log4j.logger.org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation=TRACE # Uncomment this line to enable tracing on _every_ RPC call (this can be a lot of output) #log4j.logger.org.apache.hadoop.ipc.HBaseServer.trace=DEBUG # Uncomment the below if you want to remove logging of client region caching' # and scan of .META. messages # log4j.logger.org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation=INFO # log4j.logger.org.apache.hadoop.hbase.client.MetaScanner=INFO