On Wed, Jul 6, 2011 at 5:37 AM, Xu-Feng Mao <m9s...@gmail.com> wrote:
>> Can anyone give a detailed example, step by step instruction would be
>> greatly appreciated.
>> My understand is we should
>> 1.Since we already has the lost region, we now have start and end keys.
>> 2.generate the row represents the missing region. But how can I generate
>> the encoded name?
Its generate for you when you create an HRegionInfo instance (See its
constructors; it takes start and end keys as well as HTableDesc
instance for your table).
>> It looks like I need
>> column=info:server,column=info:serverstartcode and column=info:regioninfo
>> for the missing region.
info:startcode and info:server will be added for you on assign. You
just add the info:regioninfo.
>> As for the name of row, it consists of tablename, startkey, encode, and
>> one more long number,
>> how to get this number?
The row key is the region name. Region name is made up of the
startkey, encode, and a hash of the startkey, encode..... Its made
for you when you create the HRegionInfo instance.
See below for more.
>> 3.use assing command in the hbase shell
>>
>> We also tried check_meta.rb --fix, it reports
>> ====
>> 11/07/06 00:09:08 WARN check_meta: hole after REGION => {NAME =>
>> 'STable,ztqdVD8fCMP-dDbXUAydankboD4=,1305619724446.c45191821053d03537596f4a2e759718.',
>> STARTKEY => 'ztqdVD8fCMP-dDbXUAydankboD4=', ENDKEY =>
>> 'ztxrGmCwn-6BE32s3cX1TNeHU_I=', ENCODED => c45191821053d03537596f4a2e759718,
>> TABLE => {{NAME => 'STable', FAMILIES => [{NAME => 'file', BLOOMFILTER =>
>> 'NONE', REPLICATION_SCOPE => '0', COMPRESSION => 'NONE', VERSIONS => '3',
>> TTL => '2147483647', BLOCKSIZE => '65536', IN_MEMORY => 'false', BLOCKCACHE
>> => 'true'}, {NAME => 'filelength', BLOOMFILTER => 'NONE', REPLICATION_SCOPE
>> => '0', COMPRESSION => 'NONE', VERSIONS => '3', TTL => '2147483647',
>> BLOCKSIZE => '65536', IN_MEMORY => 'false', BLOCKCACHE => 'true'}, {NAME =>
>> 'userbucket', BLOOMFILTER => 'NONE', REPLICATION_SCOPE => '0', COMPRESSION
>> => 'NONE', VERSIONS => '3', TTL => '2147483647', BLOCKSIZE => '65536',
>> IN_MEMORY => 'false', BLOCKCACHE => 'true'}, {NAME => 'userpass',
>> BLOOMFILTER => 'NONE', REPLICATION_SCOPE => '0', COMPRESSION => 'NONE',
>> VERSIONS => '3', TTL => '2147483647', BLOCKSIZE => '65536', IN_MEMORY =>
>> 'false', BLOCKCACHE => 'true'}]}}
>> 11/07/06 00:28:40 WARN check_meta: Missing .regioninfo:
>> hdfs://hd0013.c.gj.com:9000/hbase/STable/3e6faca40a7ccad7ed8c0b5848c0f945/.regioninfo
>> ====
>>
>> The problem is still there. BTW, what about the blue warning? Is this a
>> serious issue?
Yes. check_meta.rb can't find the missing region on the fs so it
can't repair it. You'll need to hack check_meta.rb so it doesn't get
the HRegionInfo to use by reading the filesystem. Instead create the
instance to insert in your version of check_meta.rb.
>> The situation is quite hard to us, it looks like even we can fill the hole
>> in the meta, we would lost all the data in the hole region, right?
>>
If its the bug I cited in my previous message, yes. Its critical we
fix it and roll out a 0.90.4.
St.Ack
