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https://issues.apache.org/jira/browse/HBASE-14119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14634395#comment-14634395
 ] 

Hadoop QA commented on HBASE-14119:
-----------------------------------

{color:red}-1 overall{color}.  Here are the results of testing the latest 
attachment 
  
http://issues.apache.org/jira/secure/attachment/12746196/HBASE-14119-branch-1.patch
  against branch-1 branch at commit 0f614a1c44e1887ca7177b66bb6208b6e69db7e1.
  ATTACHMENT ID: 12746196

    {color:green}+1 @author{color}.  The patch does not contain any @author 
tags.

    {color:red}-1 tests included{color}.  The patch doesn't appear to include 
any new or modified tests.
                        Please justify why no new tests are needed for this 
patch.
                        Also please list what manual steps were performed to 
verify this patch.

    {color:green}+1 hadoop versions{color}. The patch compiles with all 
supported hadoop versions (2.4.0 2.4.1 2.5.0 2.5.1 2.5.2 2.6.0 2.7.0)

    {color:green}+1 javac{color}.  The applied patch does not increase the 
total number of javac compiler warnings.

    {color:green}+1 protoc{color}.  The applied patch does not increase the 
total number of protoc compiler warnings.

    {color:green}+1 javadoc{color}.  The javadoc tool did not generate any 
warning messages.

    {color:green}+1 checkstyle{color}.  The applied patch does not increase the 
total number of checkstyle errors

    {color:green}+1 findbugs{color}.  The patch does not introduce any  new 
Findbugs (version 2.0.3) warnings.

    {color:green}+1 release audit{color}.  The applied patch does not increase 
the total number of release audit warnings.

    {color:green}+1 lineLengths{color}.  The patch does not introduce lines 
longer than 100

  {color:green}+1 site{color}.  The mvn post-site goal succeeds with this patch.

    {color:green}+1 core tests{color}.  The patch passed unit tests in .

Test results: 
https://builds.apache.org/job/PreCommit-HBASE-Build/14844//testReport/
Release Findbugs (version 2.0.3)        warnings: 
https://builds.apache.org/job/PreCommit-HBASE-Build/14844//artifact/patchprocess/newFindbugsWarnings.html
Checkstyle Errors: 
https://builds.apache.org/job/PreCommit-HBASE-Build/14844//artifact/patchprocess/checkstyle-aggregate.html

  Console output: 
https://builds.apache.org/job/PreCommit-HBASE-Build/14844//console

This message is automatically generated.

> Show meaningful error messages instead of stack traces in hbase shell 
> commands. Fixing few commands in this jira.
> -----------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-14119
>                 URL: https://issues.apache.org/jira/browse/HBASE-14119
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Apekshit Sharma
>            Assignee: Apekshit Sharma
>            Priority: Minor
>             Fix For: 2.0.0, 1.2.0, 1.1.2
>
>         Attachments: HBASE-14119-branch-1.patch, HBASE-14119.patch
>
>
> This isn't really a functional bug, just more about erroring out cleanly.
> In the future, everyone should check and catch exceptions. Meaningful error 
> messages should be shown instead of stack traces. For debugging purposes, 
> 'hbase shell -d' can be used which outputs a detailed stack trace.
> * the shell commands assign, move, unassign and merge_region can throw the 
> following error if given an invalid argument:
> {noformat}
> hbase(main):032:0> unassign 'adsfdsafdsa'
> ERROR: org.apache.hadoop.ipc.RemoteException: 
> org.apache.hadoop.hbase.UnknownRegionException: adsfdsafdsa
>       at org.apache.hadoop.hbase.master.HMaster.unassign(HMaster.java:1562)
>       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>       at 
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>       at 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>       at java.lang.reflect.Method.invoke(Method.java:597)
>       at 
> org.apache.hadoop.hbase.ipc.WritableRpcEngine$Server.call(WritableRpcEngine.java:364)
>       at 
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1336)
> Here is some help for this command:
> Unassign a region. Unassign will close region in current location and then
> reopen it again.  Pass 'true' to force the unassignment ('force' will clear
> all in-memory state in master before the reassign. If results in
> double assignment use hbck -fix to resolve. To be used by experts).
> Use with caution.  For expert use only.  Examples:
>   hbase> unassign 'REGIONNAME'
>   hbase> unassign 'REGIONNAME', true
> hbase(main):033:0> 
> {noformat}
> * drop_namespace, describe_namespace throw stack trace too.
> {noformat}
> hbase(main):002:0> drop_namespace "SDf"
> ERROR: org.apache.hadoop.hbase.NamespaceNotFoundException: SDf
>       at 
> org.apache.hadoop.hbase.master.TableNamespaceManager.remove(TableNamespaceManager.java:175)
>       at 
> org.apache.hadoop.hbase.master.HMaster.deleteNamespace(HMaster.java:2119)
>       at 
> org.apache.hadoop.hbase.master.MasterRpcServices.deleteNamespace(MasterRpcServices.java:430)
>       at 
> org.apache.hadoop.hbase.protobuf.generated.MasterProtos$MasterService$2.callBlockingMethod(MasterProtos.java:44279)
>       at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2035)
>       at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:107)
>       at 
> org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:130)
>       at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:107)
>       at java.lang.Thread.run(Thread.java:745)
> Here is some help for this command:
> Drop the named namespace. The namespace must be empty.
> {noformat}
> * fix error message in close_region
> {noformat}
> hbase(main):007:0> close_region "sdf"
> ERROR: sdf
> {noformat}
> * delete_snapshot throws exception too.
> {noformat}
> ERROR: org.apache.hadoop.hbase.snapshot.SnapshotDoesNotExistException: 
> Snapshot 'sdf' doesn't exist on the filesystem
>       at 
> org.apache.hadoop.hbase.master.snapshot.SnapshotManager.deleteSnapshot(SnapshotManager.java:270)
>       at 
> org.apache.hadoop.hbase.master.MasterRpcServices.deleteSnapshot(MasterRpcServices.java:452)
>       at 
> org.apache.hadoop.hbase.protobuf.generated.MasterProtos$MasterService$2.callBlockingMethod(MasterProtos.java:44261)
>       at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2035)
>       at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:107)
>       at 
> org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:130)
>       at org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:107)
>       at java.lang.Thread.run(Thread.java:745)
> Here is some help for this command:
> Delete a specified snapshot. Examples:
>   hbase> delete_snapshot 'snapshotName',
> {noformat}
> other commands, when given bogus arguments, tend to fail cleanly and not 
> leave stacktrace in the output.



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