I replicated this locally and then did the following surgery to fix it.
Create a table and determine its table id. The table foo is table id
2. This tableid is used for rows in metadata table.
root@uno> createtable foo
root@uno foo> tables -l
accumulo.metadata => !0
accumulo.replication => +rep
accumulo.root => +r
foo => 2
trace => 1
Add the empty split and another split.
root@uno foo> addsplits -t foo '' abc
Inpect the metdata table.
root@uno foo> scan -t accumulo.metadata -b 2;
2; loc:1000174d2400003 [] localhost:9997
2; srv:dir [] hdfs://localhost:8020/accumulo/tables/2/t-0000005
2; srv:lock [] tservers/localhost:9997/zlock-0000000000$1000174d2400003
2; srv:time [] M0
2; ~tab:~pr [] \x00
2;abc loc:1000174d2400003 [] localhost:9997
2;abc srv:dir [] hdfs://localhost:8020/accumulo/tables/2/t-0000006
2;abc srv:lock [] tservers/localhost:9997/zlock-0000000000$1000174d2400003
2;abc srv:time [] M0
2;abc ~tab:~pr [] \x01
2< loc:1000174d2400003 [] localhost:9997
2< srv:dir [] hdfs://localhost:8020/accumulo/tables/2/default_tablet
2< srv:lock [] tservers/localhost:9997/zlock-0000000000$1000174d2400003
2< srv:time [] M0
2< ~tab:~pr [] \x01abc
Insert some data
root@uno foo> insert a f q v1
root@uno foo> insert b f q v2
Offline table and grant write permission to metadata.
root@uno foo> offline -t foo -w
root@uno foo> grant Table.WRITE -u root -t accumulo.metadata
Delete the tablet with an empty end row
root@uno foo> deletemany -r 2; -t accumulo.metadata
Delete { 2; srv:dir [] } ? y
[DELETED] 2; srv:dir []
Delete { 2; srv:lock [] } ? y
[DELETED] 2; srv:lock []
Delete { 2; srv:time [] } ? y
[DELETED] 2; srv:time []
Delete { 2; ~tab:~pr [] } ? y
[DELETED] 2; ~tab:~pr []
Fix the tablet with end row "abc" to indicate no previous tablet
root@uno foo> table accumulo.metadata
root@uno accumulo.metadata> insert 2;abc ~tab ~pr \x00
Bring table online and scan it
root@uno accumulo.metadata> online foo
root@uno accumulo.metadata> scan -t foo
a f:q [] v1
b f:q [] v2
Remove write permission to metadata table.
root@uno accumulo.metadata> revoke Table.WRITE -u root -t accumulo.metadata
On Thu, Mar 1, 2018 at 8:46 PM, Dong Zhou <[email protected]> wrote:
> Hi all,
>
> I noticed that adding an empty string to as a split will cause merge command
> failed the consistency check.
>
> 2018-03-01 19:58:46,724 [state.MergeStats] DEBUG: chopped 442 v.chopped 441
> unassigned 442 v.unassigned 441 verify.total 441
> 2018-03-01 19:58:46,724 [state.MergeStats] INFO : Merge consistency check
> failed 1b<<
>
> Also, is there a way to remove an unwanted split from table. Merge is one
> way, but with empty string does not work.
>
> Cheers,
>
> -Dong Zhou
