Hi Tatsuya,
>This one is a commercial book from a Japanese publisher, so I'll do
this by myself.
I see. I'll be looking forward to reading your book.
>I created a Jira entry to track this task:
>https://issues.apache.org/jira/browse/HBASE-3391
Good job. I'm glad to work with you on the translation.
Maybe I can translate the book to Chinese, too.
> Are you working at Rakuten in Tokyo? Maybe we can meet at next Hadoop
Source Code Reading at Rakuten
Tower. Do you know this event?
I'm working for Rakuten at the Osaka branch.
So I don't know if I can go to Tokyo to meet you at next Hadoop Source
Code Reading event.
May I send you a greeting email from my personal address, and talk about
your plan via email at first?
Thanks,
On 01/26/2011 12:34 PM, Tatsuya Kawano wrote:
Hi Yifeng,
#4. Writing Japanese books and documents
I am glad if I can work on this one with you.
Thanks for your offer. Let me explain a bit more about them.
-- Currently I'm authoring a book chapter about HBase for a Japanese NOSQL book
This one is a commercial book from a Japanese publisher, so I'll do this by
myself.
-- I'll translate The Apache HBase Book to Japanese
This one comes with HBase, and I'm looking for some people (like you) to work
with.
http://hbase.apache.org/book.html
I created a Jira entry to track this task:
https://issues.apache.org/jira/browse/HBASE-3391
Are you working at Rakuten in Tokyo? Maybe we can meet at next Hadoop Source
Code Reading at Rakuten Tower. Do you know this event?
Thanks,
Tatsuya
--
Tatsuya Kawano (Mr.)
Tokyo, Japan
On Jan 25, 2011, at 11:03 AM, Yifeng Jiang<[email protected]>
wrote:
#4. Writing Japanese books and documents
I am glad if I can work on this one with you.
On 01/23/2011 10:18 AM, Tatsuya Kawano wrote:
Hi,
I wanted to let you know that I'm planning to contribute the following items to
the HBase community. These are my spare time projects and I'll only be able to
spend my time about 7 hours a week, so the progress will be very slow. I want
some feedback from you guys to prioritize them. Also, if someone/team wants to
work on them (with me or alone), I'll be happy to provide more details.
1. RADOS integration
Run HBase not only on HDFS but also RADOS distributed object store (the lower
layer of Ceph), so that the following options will become available to HBase
users:
-- No SPOF (RADOS doesn't have the name node(s), but only ZK-like monitors and
data nodes)
-- Instant backup of HBase tables (RADOS provides copy-on-write snapshot per
object pool)
-- Extra durability option on WAL (RADOS can do both synchronous and
asynchronous disk flush. HDFS doesn't have the earlier option)
Note:
RADOS object = HFile, WAL
object pool = group of HFiles or WAL
Current status: Design phase
2. mapreduce.HFileInputFormat
MR library to read data directly from HFiles. (Roughly 2.5 times faster than
TableInputFormat in my tests)
Current status: Completed a proof-of-concept prototype and measured performance.
3. Enhance Get/Scan performance of RS
Add an hash code and a couple of flags to HFile at the flush time and change
scanner implementation so that:
-- Get/Scan operations will get faster. (less key comparisons for reconstructing a
row: O(h * c) -> O(h). [h = number of HFiles for the row, c = number of
columns in an HFile])
-- The size of HFiles will become a bit smaller. (The flags will eliminate
duplicate bytes in keys (row, column family and qualifier) from HFiles.)
Current status: Completed a proof-of-concept prototype and measured performance.
Detals:
https://github.com/tatsuya6502/hbase-mr-pof/
(I meant "poc" not "pof"...)
4. Writing Japanese books and documents
-- Currently I'm authoring a book chapter about HBase for a Japanese NOSQL book
-- I'll translate The Apache HBase Book to Japanese
Thank you,
--
Tatsuya Kawano (Mr.)
Tokyo, Japan
http://twitter.com/#!/tatsuya6502
--
Yifeng Jiang
--
Yifeng Jiang
