HBase hbck: false positive error reported for parent regions that are in
offline state in meta after a split
------------------------------------------------------------------------------------------------------------
Key: HBASE-2876
URL: https://issues.apache.org/jira/browse/HBASE-2876
Project: HBase
Issue Type: Bug
Reporter: Kannan Muthukkaruppan
HBase Checker will sometimes report something like the following:
{code}
ERROR: Region test1,9922400000,1279934604048.8cb65b1882960f230abb97860dd13c53.
is not served by any region server but is listed in META to be on server null
{code}
The region in question is a parent region that has been offlined following a
split. META still contains for the above region only because there are daughter
regions which still have references to the parent region. Once the daughter
regions undergo compaction, these references will be gone; and the parent
region's entry will be removed from META. But "hbck" should detect entries in
this condition and not complain.
{code}
test1,9922400000,12799346 column=info:regioninfo, timestamp=1279938675016,
value=REGION => {NAME =>
04048.8cb65b1882960f230ab
'test1,9922400000,1279934604048.8cb65b1882960f230abb97860dd13c53.', STAR
b97860dd13c53. TKEY => '9922400000', ENDKEY => '', ENCODED =>
8cb65b1882960f230abb97860d
d13c53, OFFLINE => true, SPLIT => true, TABLE =>
{{NAME => 'test1', FAMIL
IES => [{NAME => 'actions', BLOOMFILTER => 'NONE',
REPLICATION_SCOPE => '
0', VERSIONS => '3', COMPRESSION => 'NONE', TTL =>
'2147483647', BLOCKSIZ
E => '65536', IN_MEMORY => 'false', BLOCKCACHE =>
'true'}]}}
test1,9922400000,12799346 column=info:server, timestamp=1279938675016, value=
04048.8cb65b1882960f230ab
b97860dd13c53.
test1,9922400000,12799346 column=info:serverstartcode,
timestamp=1279938675016, value=
04048.8cb65b1882960f230ab
b97860dd13c53.
test1,9922400000,12799346 column=info:splitA, timestamp=1279938675016,
value=\x00\x0A9961500000\x00
04048.8cb65b1882960f230ab
\x00\x00\x01*\x02J9'@test1,9922400000,1279938672935.94425ba581acd336d1cbd
b97860dd13c53.
11181ee2785.\x00\x0A9922400000\x00\x00\x00\x05\x05test1\x00\x00\x00\x00\x
00\x02\x00\x00\x00\x07IS_ROOT\x00\x00\x00\x05false\x00\x00\x00\x07IS_META
\x00\x00\x00\x05false\x00\x00\x00\x01\x08\x07actions\x00\x00\x00\x08\x00\
x00\x00\x0BBLOOMFILTER\x00\x00\x00\x04NONE\x00\x00\x00\x11REPLICATION_SCO
PE\x00\x00\x00\x010\x00\x00\x00\x0BCOMPRESSION\x00\x00\x00\x04NONE\x00\x0
0\x00\x08VERSIONS\x00\x00\x00\x013\x00\x00\x00\x03TTL\x00\x00\x00\x0A2147
483647\x00\x00\x00\x09BLOCKSIZE\x00\x00\x00\x0565536\x00\x00\x00\x09IN_ME
MORY\x00\x00\x00\x05false\x00\x00\x00\x0ABLOCKCACHE\x00\x00\x00\x04true\x
B7\x04q\x18
test1,9922400000,12799346 column=info:splitB, timestamp=1279938675016,
value=\x00\x00\x00\x00\x00\x
04048.8cb65b1882960f230ab
01*\x02J9'@test1,9961500000,1279938672935.bb521c9d8c51fd8133f145dc3c75013
b97860dd13c53.
6.\x00\x0A9961500000\x00\x00\x00\x05\x05test1\x00\x00\x00\x00\x00\x02\x00
\x00\x00\x07IS_ROOT\x00\x00\x00\x05false\x00\x00\x00\x07IS_META\x00\x00\x
00\x05false\x00\x00\x00\x01\x08\x07actions\x00\x00\x00\x08\x00\x00\x00\x0
BBLOOMFILTER\x00\x00\x00\x04NONE\x00\x00\x00\x11REPLICATION_SCOPE\x00\x00
\x00\x010\x00\x00\x00\x0BCOMPRESSION\x00\x00\x00\x04NONE\x00\x00\x00\x08V
ERSIONS\x00\x00\x00\x013\x00\x00\x00\x03TTL\x00\x00\x00\x0A2147483647\x00
\x00\x00\x09BLOCKSIZE\x00\x00\x00\x0565536\x00\x00\x00\x09IN_MEMORY\x00\x
00\x00\x05false\x00\x00\x00\x0ABLOCKCACHE\x00\x00\x00\x04true"\xE8XD
{code}
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