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https://issues.apache.org/jira/browse/HBASE-5313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13233244#comment-13233244
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Hudson commented on HBASE-5313:
-------------------------------
Integrated in HBase-TRUNK-security #143 (See
[https://builds.apache.org/job/HBase-TRUNK-security/143/])
HBASE-5521 [jira] Move compression/decompression to an encoder specific
encoding
context
Author: Yongqiang He
Summary:
https://issues.apache.org/jira/browse/HBASE-5521
As part of working on HBASE-5313, we want to add a new columnar encoder/decoder.
It makes sense to move compression to be part of encoder/decoder:
1) a scanner for a columnar encoded block can do lazy decompression to a
specific part of a key value object
2) avoid an extra bytes copy from encoder to hblock-writer.
If there is no encoder specified for a writer, the HBlock.Writer will use a
default compression-context to do something very similar to today's code.
Test Plan: existing unit tests verified by mbautin and tedyu. And no new test
added here since this code is just a preparation for columnar encoder. Will add
testcase later in that diff.
Reviewers: dhruba, tedyu, sc, mbautin
Reviewed By: mbautin
Differential Revision: https://reviews.facebook.net/D2097 (Revision 1302602)
Result = FAILURE
mbautin :
Files :
*
/hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/encoding/BufferedDataBlockEncoder.java
*
/hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/encoding/CopyKeyDataBlockEncoder.java
*
/hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/encoding/DataBlockEncoder.java
*
/hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/encoding/DataBlockEncoding.java
*
/hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/encoding/DiffKeyDeltaEncoder.java
*
/hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/encoding/EncodedDataBlock.java
*
/hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/encoding/FastDiffDeltaEncoder.java
*
/hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/encoding/HFileBlockDecodingContext.java
*
/hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/encoding/HFileBlockDefaultDecodingContext.java
*
/hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/encoding/HFileBlockDefaultEncodingContext.java
*
/hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/encoding/HFileBlockEncodingContext.java
*
/hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/encoding/PrefixKeyDeltaEncoder.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/hfile/Compression.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileBlock.java
*
/hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileDataBlockEncoder.java
*
/hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileDataBlockEncoderImpl.java
* /hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileWriterV2.java
*
/hbase/trunk/src/main/java/org/apache/hadoop/hbase/io/hfile/NoOpDataBlockEncoder.java
*
/hbase/trunk/src/test/java/org/apache/hadoop/hbase/io/encoding/TestDataBlockEncoders.java
*
/hbase/trunk/src/test/java/org/apache/hadoop/hbase/io/hfile/TestHFileBlock.java
*
/hbase/trunk/src/test/java/org/apache/hadoop/hbase/io/hfile/TestHFileBlockCompatibility.java
*
/hbase/trunk/src/test/java/org/apache/hadoop/hbase/io/hfile/TestHFileDataBlockEncoder.java
*
/hbase/trunk/src/test/java/org/apache/hadoop/hbase/regionserver/DataBlockEncodingTool.java
> Restructure hfiles layout for better compression
> ------------------------------------------------
>
> Key: HBASE-5313
> URL: https://issues.apache.org/jira/browse/HBASE-5313
> Project: HBase
> Issue Type: Improvement
> Components: io
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
>
> A HFile block contain a stream of key-values. Can we can organize these kvs
> on the disk in a better way so that we get much greater compression ratios?
> One option (thanks Prakash) is to store all the keys in the beginning of the
> block (let's call this the key-section) and then store all their
> corresponding values towards the end of the block. This will allow us to
> not-even decompress the values when we are scanning and skipping over rows in
> the block.
> Any other ideas?
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