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Re: Poor HBase map-reduce scan performance - HBase - [mail # user]
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...Not that it's a long-term solution, but try major-compacting before running the benchmark. If the LSM tree is CPU bound in merging HFiles/KeyValues through the PriorityQueue, then redu...
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Author: Matt Corgan,
2013-05-01, 06:52
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[HBASE-7323] add Cell interface to SeekerState and BufferedEncodedSeeker - HBase - [issue]
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...SeekerState is the staging site for a Cell while it is being assembled by the BufferedEncodedSeeker. When the parent StoreFileScanner calls getCurrentCell() it's guaranteed that the Ce...
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http://issues.apache.org/jira/browse/HBASE-7323
Author: Matt Corgan,
2013-04-22, 06:27
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Re: Cell Encoders and usage of Cell - HBase - [mail # dev]
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...I'm not 100% clear what you're asking Nick. My understanding is that Cell and KeyValue are identical with regards to the timestamp. Timestamp is part of the identity of the Cell/...
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Author: Matt Corgan,
2013-04-22, 00:36
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Re: Cell Encoders and usage of Cell - HBase - [mail # dev]
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...fyi Ram - i started adding the Cell interface to the read path of the delta encoders in HBASE-7323 . It's one possible place to start working on it. On Thu, Apr 18, 2013 at 8:19...
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Author: Matt Corgan,
2013-04-21, 21:47
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Re: HBase Types: Explicit Null Support - HBase - [mail # user]
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...Ah, I didn't even realize sql allowed null key parts. Maybe a goal of the interfaces should be to provide first-class support for custom user types in addition to the standard ones inc...
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Author: Matt Corgan,
2013-04-02, 06:17
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Re: HBase Types: Explicit Null Support - HBase - [mail # user]
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...I generally don't allow nulls in my composite row keys. Does SQL allow nulls in the PK? In the rare case I wanted to do that I might create a separate format called NullableCInt3...
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Author: Matt Corgan,
2013-04-02, 00:07
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Re: HBase Types: Explicit Null Support - HBase - [mail # user]
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...I spent some time this weekend extracting bits of our serialization code to a public github repo at http://github.com/hotpads/data-tools. Contributions are welcome - i'm sure we all ha...
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Author: Matt Corgan,
2013-04-01, 19:26
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Eliminating duplicate values - HBase - [mail # user]
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...I have a few use cases where I'd like to leverage HBase's high write throughput to blindly write lots of data even if most of it hasn't changed since the last write. I want to retain M...
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Author: Matt Corgan,
2013-03-03, 03:42
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[HBASE-7660] Remove HFileV1 code - HBase - [issue]
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...HFileV1 should be removed from the regionserver because it is somewhat of a drag on development for working on the lower level read paths. It's an impediment to cleaning up the Store c...
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http://issues.apache.org/jira/browse/HBASE-7660
Author: Matt Corgan,
2013-02-26, 05:50
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Re: Guidance for running MR jobs against trunk/0.95 - HBase - [mail # dev]
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...Right now only used at runtime on the server. I guess we need a way to prevent instantiation on the client. If we allowed it as one of the client RPC encodings, then client would...
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Author: Matt Corgan,
2013-02-26, 00:01
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