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https://issues.apache.org/jira/browse/HBASE-23909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17052211#comment-17052211
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Viraj Jasani commented on HBASE-23909:
--------------------------------------
However, this might happen it seems if region has null servername, let me dig
in more
> list_regions fails if table is under split
> ------------------------------------------
>
> Key: HBASE-23909
> URL: https://issues.apache.org/jira/browse/HBASE-23909
> Project: HBase
> Issue Type: Bug
> Components: shell
> Affects Versions: 1.6.0
> Reporter: Peter Somogyi
> Priority: Minor
>
> Shortly after executing split 'table' command from the shell the list_regions
> 'table' fails with "ERROR: undefined method `toString' for nil:NilClass"
>
> {noformat}
> hbase(main):002:0> list_regions 'cluster_test'
> SERVER_NAME |
> REGION_NAME | START_KEY | END_KEY | SIZE | REQ |
> LOCALITY |
> --------------------------- |
> --------------------------------------------------------------------- |
> ---------- | ---------- | ----- | -------- | ---------- |
> nokedli,34665,1582736360668 |
> cluster_test,,1582736408029.857a9b734a2f490e573ba20b1bbf99b3. | |
> 33333333 | 3348 | 20408042 | 0.0 |
> nokedli,34665,1582736360668 |
> cluster_test,33333333,1582736408029.1749360028b3a5e76b5da1d1888e5b9d. |
> 33333333 | 66666666 | 3321 | 20242123 | 0.0 |
> nokedli,34665,1582736360668 |
> cluster_test,66666666,1582736408029.1f1366aa0ee621d496103ac5a50bca77. |
> 66666666 | 99999999 | 3316 | 20215774 | 0.0 |
> nokedli,34665,1582736360668 |
> cluster_test,99999999,1582736408029.ae95589c9498443a89aea4c42c199372. |
> 99999999 | cccccccc | 3327 | 20285312 | 0.0 |
> nokedli,34665,1582736360668 |
> cluster_test,cccccccc,1582736408029.239647c37e27cbd3154180ce5004a1ea. |
> cccccccc | | 3355 | 20451469 | 0.0 |
> 5 rows
> hbase(main):003:0> split 'cluster_test'
> 0 row(s) in 0.2240 seconds
> hbase(main):004:0> list_regions 'cluster_test'
> ERROR: undefined method `toString' for nil:NilClass
> Here is some help for this command:
> List all regions for a particular table as an array and also filter
> them by server name (optional) as prefix
> and maximum locality (optional). By default, it will return all the
> regions for the table with any locality.
> The command displays server name, region name, start key, end key,
> size of the region in MB, number of requests
> and the locality. The information can be projected out via an array
> as third parameter. By default all these information
> is displayed. Possible array values are SERVER_NAME, REGION_NAME,
> START_KEY, END_KEY, SIZE, REQ and LOCALITY. Values
> are not case sensitive. If you don't want to filter by server name,
> pass an empty hash / string as shown below.
> Examples:
> hbase> list_regions 'table_name'
> hbase> list_regions 'table_name', 'server_name'
> hbase> list_regions 'table_name', {SERVER_NAME => 'server_name',
> LOCALITY_THRESHOLD => 0.8}
> hbase> list_regions 'table_name', {SERVER_NAME => 'server_name',
> LOCALITY_THRESHOLD => 0.8}, ['SERVER_NAME']
> hbase> list_regions 'table_name', {}, ['SERVER_NAME', 'start_key']
> hbase> list_regions 'table_name', '', ['SERVER_NAME', 'start_key']
> hbase(main):005:0> list_regions 'cluster_test'
> SERVER_NAME |
> REGION_NAME |
> START_KEY | END_KEY | SIZE |
> REQ | LOCALITY |
> --------------------------- |
> ----------------------------------------------------------------------------------------------------
> | --------------------------------------- |
> --------------------------------------- | ----- | -------- | ---------- |
> nokedli,34665,1582736360668 |
> cluster_test,,1582878981608.614acededc61f55a10816bb871d0421b. |
> | 197f83f2390a2a0c4104f4630982c585-461828 | 3348 |
> 10204021 | 0.0 |
> nokedli,34665,1582736360668 |
> cluster_test,197f83f2390a2a0c4104f4630982c585-461828,1582878981608.5987f972793bd422564a0758e545caa5.
> | 197f83f2390a2a0c4104f4630982c585-461828 |
> 33333333 | 3348 | 10204021 | 0.0 |
> nokedli,34665,1582736360668 |
> cluster_test,33333333,1582878982425.a306381f3ee03161dc832eaca066131b. |
> 33333333 | 4cdfa653a3843d49a62004a6e4e71636-501997 |
> 3321 | 10121061 | 0.0 |
> nokedli,34665,1582736360668 |
> cluster_test,4cdfa653a3843d49a62004a6e4e71636-501997,1582878982425.ae87e47584e3dee98e524f961fa6906e.
> | 4cdfa653a3843d49a62004a6e4e71636-501997 |
> 66666666 | 3321 | 10121061 | 0.0 |
> nokedli,34665,1582736360668 |
> cluster_test,66666666,1582878983449.d4015a18e47a9aeec89a1ead9a974186. |
> 66666666 | 7ffd66580ac07b1ff7636f9b15609fa6-238805 |
> 3316 | 10107887 | 0.0 |
> nokedli,34665,1582736360668 |
> cluster_test,7ffd66580ac07b1ff7636f9b15609fa6-238805,1582878983449.c92f8a7b3a89fee59313bdb516720319.
> | 7ffd66580ac07b1ff7636f9b15609fa6-238805 |
> 99999999 | 3316 | 10107887 | 0.0 |
> nokedli,34665,1582736360668 |
> cluster_test,99999999,1582878984099.36d0e3d56119f2bdcae280853c29321d. |
> 99999999 | b36cb3f90c3019779ba5a3b00fb6da2f-320789 |
> 3327 | 10142656 | 0.0 |
> nokedli,34665,1582736360668 |
> cluster_test,b36cb3f90c3019779ba5a3b00fb6da2f-320789,1582878984099.9d76372540e628675a4aea5a8979107d.
> | b36cb3f90c3019779ba5a3b00fb6da2f-320789 |
> cccccccc | 3327 | 10142656 | 0.0 |
> nokedli,34665,1582736360668 |
> cluster_test,cccccccc,1582878984966.1292a5f5dbd5f454d5d3b3cf048c4a75. |
> cccccccc | e66d48d7b227e7845b73d43eb1a06fcb-86032 |
> 3355 | 10225734 | 0.0 |
> nokedli,34665,1582736360668 |
> cluster_test,e66d48d7b227e7845b73d43eb1a06fcb-86032,1582878984966.6765ff09c59899363ae9be115a9c3d78.
> | e66d48d7b227e7845b73d43eb1a06fcb-86032 |
> | 3355 | 10225734 | 0.0 |
> 10 rowshbase(main):006:0>{noformat}
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