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https://issues.apache.org/jira/browse/HBASE-3211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12930880#action_12930880
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HBase Review Board commented on HBASE-3211:
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Message from: "Nicolas" <nspiegelb...@facebook.com>
bq. On 2010-11-10 16:01:22, Nicolas wrote:
bq. > trunk/src/main/java/org/apache/hadoop/hbase/KeyValue.java, line 1199
bq. > <http://review.cloudera.org/r/1208/diff/1/?file=17147#file17147line1199>
bq. >
bq. > Would it be more straightforward to have a ReturnCode.MODIFY, that
signals an include but suggests that the program must call modifyKeyValue() to
get the transformed data. Maybe this is too much of a one-off case...
bq.
bq. Jonathan Gray wrote:
bq. Not sure I completely follow. You're saying the modification would
happen outside the filter? No one needs to call modifyKeyValue() to get the
transformed data, it's done in the filter.
bq.
bq. In any case, yeah, I would not be for adding another ReturnCode just
for this.
I suggested this alternative because users normally expect filters to do
immutable operations on the data itself, and you're introducing side effects.
If we stay with this paradigm, it's probably best to add a note in
Filter.filterKeyValue() that the KeyValue may be modified.
- Nicolas
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> Key (Index) Only Fetches
> ------------------------
>
> Key: HBASE-3211
> URL: https://issues.apache.org/jira/browse/HBASE-3211
> Project: HBase
> Issue Type: Improvement
> Reporter: Kannan Muthukkaruppan
> Assignee: Jonathan Gray
> Fix For: 0.90.0
>
> Attachments: HBASE-3211-v2.patch, HBASE-3211-v3.patch
>
>
> When you retrieve data from HBase you get Key (Row+Column+Timestamp) +
> Values.
> It would be nice to have a mode where we only fetch the keys (i.e. the index)
> but not the values.
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