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From "Phabricator (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6597) Block Encoding Size Estimation
Date Mon, 08 Oct 2012 19:00:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13471766#comment-13471766
] 

Phabricator commented on HBASE-6597:
------------------------------------

mbautin has commented on the revision "[jira] [HBASE-6597] [89-fb] Incremental data block
encoding".

INLINE COMMENTS
  src/main/java/org/apache/hadoop/hbase/io/encoding/BufferedDataBlockEncoder.java:38 Done.
  src/main/java/org/apache/hadoop/hbase/io/encoding/CopyKeyDataBlockEncoder.java:93 Yes, that's
a good catch.
  src/main/java/org/apache/hadoop/hbase/io/encoding/DiffKeyDeltaEncoder.java:340 Done.
  src/main/java/org/apache/hadoop/hbase/io/encoding/DiffKeyDeltaEncoder.java:420 Done (here
and in other encoded writers).
  src/main/java/org/apache/hadoop/hbase/io/encoding/DiffKeyDeltaEncoder.java:422 Yes, the
comment was incorrect. Moved this field to the encoder state.
  src/main/java/org/apache/hadoop/hbase/io/encoding/DiffKeyDeltaEncoder.java:497 Done.
  src/main/java/org/apache/hadoop/hbase/io/encoding/FastDiffDeltaEncoder.java:411 Done.
  src/main/java/org/apache/hadoop/hbase/io/encoding/PrefixKeyDeltaEncoder.java:173 Done.
  src/main/java/org/apache/hadoop/hbase/io/encoding/PrefixKeyDeltaEncoder.java:186 Yes, this
javadoc was incorrect. Moved this to encoder state.

REVISION DETAIL
  https://reviews.facebook.net/D5895

To: Kannan, Karthik, Liyin, aaiyer, avf, JIRA, mbautin
Cc: tedyu

                
> Block Encoding Size Estimation
> ------------------------------
>
>                 Key: HBASE-6597
>                 URL: https://issues.apache.org/jira/browse/HBASE-6597
>             Project: HBase
>          Issue Type: Improvement
>          Components: io
>    Affects Versions: 0.89-fb
>            Reporter: Brian Nixon
>            Assignee: Mikhail Bautin
>            Priority: Minor
>         Attachments: D5895.1.patch, D5895.2.patch, D5895.3.patch
>
>
> Blocks boundaries as created by current writers are determined by the size of the unencoded
data. However, blocks in memory are kept encoded. By using an estimate for the encoded size
of the block, we can get greater consistency in size.

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