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https://issues.apache.org/jira/browse/AMBARI-24382?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16571969#comment-16571969
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Hari Sekhon commented on AMBARI-24382:
--------------------------------------
Tried reproducing this on another cluster with Ambari 2.6.2 but couldn't, not
sure if it was fixed between these versions or if there is something different
in the setup with the other cluster that triggers this bug in one scenario and
not the other.
> Ambari shouldn't deployed "Undefined" Config Values
> ---------------------------------------------------
>
> Key: AMBARI-24382
> URL: https://issues.apache.org/jira/browse/AMBARI-24382
> Project: Ambari
> Issue Type: Bug
> Components: ambari-server
> Affects Versions: 2.5.2
> Reporter: Hari Sekhon
> Priority: Blocker
>
> Ambari should not deploy any properties with "Undefined" value (breaks HBase
> Master as shown below).
> When using a config group for HBase RegionServers to only enable Bucket Cache
> on RegionServers (see AMBARI-24370), and then enabling a bunch of settings
> related to using the bucket cache in the default config, Ambari will infer
> that there should be a bucketcache setting and injects the following
> properties with a literal value of "Undefined" in hbase-site.xml:
> {code:java}
> <property>
> <name>hbase.bucketcache.ioengine</name>
> <value>Undefined</value>
> </property>
> <property>
> <name>hbase.bucketcache.size</name>
> <value>Undefined</value>
> </property>{code}
> which breaks HMaster restart:
> {code:java}
> 2018-07-30 13:26:08,283 ERROR [main] master.HMasterCommandLine: Master exiting
> java.lang.RuntimeException: Failed construction of Master: class
> org.apache.hadoop.hbase.master.HMaster
> at org.apache.hadoop.hbase.master.HMaster.constructMaster(HMaster.java:2824)
> at
> org.apache.hadoop.hbase.master.HMasterCommandLine.startMaster(HMasterCommandLine.java:235)
> at
> org.apache.hadoop.hbase.master.HMasterCommandLine.run(HMasterCommandLine.java:139)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
> at
> org.apache.hadoop.hbase.util.ServerCommandLine.doMain(ServerCommandLine.java:126)
> at org.apache.hadoop.hbase.master.HMaster.main(HMaster.java:2838)
> Caused by: java.lang.NumberFormatException: For input string: "Undefined"
> at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:2043)
> at sun.misc.FloatingDecimal.parseFloat(FloatingDecimal.java:122)
> at java.lang.Float.parseFloat(Float.java:451)
> at org.apache.hadoop.conf.Configuration.getFloat(Configuration.java:1400)
> at
> org.apache.hadoop.hbase.io.hfile.CacheConfig.getBucketCache(CacheConfig.java:597)
> at org.apache.hadoop.hbase.io.hfile.CacheConfig.getL2(CacheConfig.java:566)
> at
> org.apache.hadoop.hbase.io.hfile.CacheConfig.instantiateBlockCache(CacheConfig.java:650)
> at org.apache.hadoop.hbase.io.hfile.CacheConfig.<init>(CacheConfig.java:239)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.<init>(HRegionServer.java:591)
> at org.apache.hadoop.hbase.master.HMaster.<init>(HMaster.java:425)
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
> at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
> at org.apache.hadoop.hbase.master.HMaster.constructMaster(HMaster.java:2819)
> ... 5 more
> {code}
> The above two settings are only added to a config group RegionServers, but
> when the following settings are applied to the default config group thinking
> they should be ignored by Masters because bucket cache isn't enabled on
> Master, it turns out that Ambari infers they should exist, leaves them
> Undefined but deploys them anyway (these settings are from the OpenTSDB HBase
> performance tuning guide btw):
> {code:java}
> hbase.rs.cacheblocksonwrite=true
> hbase.rs.evictblocksonclose=false
> hfile.block.bloom.cacheonwrite=true
> hfile.block.index.cacheonwrite=true
> hbase.block.data.cachecompressed=true
> hbase.bucketcache.blockcache.single.percentage=.99
> hbase.bucketcache.blockcache.multi.percentage=0
> hbase.bucketcache.blockcache.memory.percentage=.01
> {code}
> I've worked around it by moving the config to the regionservers config group,
> but ran in to AMBARI-24371 again.
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