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https://issues.apache.org/jira/browse/HBASE-4532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13128255#comment-13128255
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[email protected] commented on HBASE-4532:
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/2393/
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(Updated 2011-10-15 18:31:25.852446)
Review request for hbase, Dhruba Borthakur, Michael Stack, Pritam Damania,
Prakash Khemani, Amitanand Aiyer, Kannan Muthukkaruppan, Jerry Chen, Liyin,
Karthik Ranganathan, and Nicolas Spiegelberg.
Summary (updated)
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HBASE-4469 avoids the top row seek operation if row-col bloom filter is
enabled.
This jira tries to avoid top row seek for all the cases by creating a dedicated
bloom filter only for row with empty column.
Previous solution is to create the dedicated bloom filter for delete family,
which does not work if there is a row with empty column.
For example,
we are interested in row1/cf1:/1/put.
So we seek to the top row: row1/cf1:/MAX_TS/MAXIMUM. And the delete family
bloom filter will say there is NO delete family.
Then it will avoid the top row seek and return a fake kv, which is the last kv
for this row (createLastOnRowCol).
In this way, we have already missed the real kv we are interested in.
The root cause is that even there is no delete family at top row, we still
cannot avoid the top row seek.
We can ONLY avoid the top row seek when there is no row with empty column, no
matter what kind of kv type (delete/deleteCol/deleteFamily/put).
So the current solution is to create the dedicate bloom filter for row with
empty column.
This patch is rebased on 0.89-fb. But it should be the same for apache-trunk as
well. I will submit the patch for apache-trunk later.
This addresses bug HBASE-4532.
https://issues.apache.org/jira/browse/HBASE-4532
Diffs
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src/main/java/org/apache/hadoop/hbase/KeyValue.java 93538bb
src/main/java/org/apache/hadoop/hbase/io/hfile/BlockType.java 9a79a74
src/main/java/org/apache/hadoop/hbase/io/hfile/HFile.java 5d9b518
src/main/java/org/apache/hadoop/hbase/io/hfile/HFilePrettyPrinter.java
6cf7cce
src/main/java/org/apache/hadoop/hbase/io/hfile/HFileReaderV1.java 1f78dd4
src/main/java/org/apache/hadoop/hbase/io/hfile/HFileReaderV2.java 3c34f86
src/main/java/org/apache/hadoop/hbase/io/hfile/HFileWriterV1.java 2e1d23a
src/main/java/org/apache/hadoop/hbase/io/hfile/HFileWriterV2.java c4b60e9
src/main/java/org/apache/hadoop/hbase/regionserver/ScanQueryMatcher.java
a1d7de5
src/main/java/org/apache/hadoop/hbase/regionserver/StoreFile.java e4dfc2e
src/main/java/org/apache/hadoop/hbase/regionserver/StoreFileScanner.java
ebb360c
src/main/java/org/apache/hadoop/hbase/regionserver/StoreScanner.java 8814812
src/main/java/org/apache/hadoop/hbase/util/BloomFilterFactory.java fb4f2df
src/test/java/org/apache/hadoop/hbase/regionserver/TestBlocksRead.java
c88b23f
src/test/java/org/apache/hadoop/hbase/regionserver/TestCompoundBloomFilter.java
48e9163
src/test/java/org/apache/hadoop/hbase/regionserver/TestStoreFile.java 0eca9b8
Diff: https://reviews.apache.org/r/2393/diff
Testing
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Running all the unit tests now
Thanks,
Liyin
> Avoid top row seek by dedicated bloom filter for delete family bloom filter
> ---------------------------------------------------------------------------
>
> Key: HBASE-4532
> URL: https://issues.apache.org/jira/browse/HBASE-4532
> Project: HBase
> Issue Type: Improvement
> Reporter: Liyin Tang
> Assignee: Liyin Tang
>
> HBASE-4469 avoids the top row seek operation if row-col bloom filter is
> enabled.
> This jira tries to avoid top row seek for all the cases by creating a
> dedicated bloom filter only for delete family
> The only subtle use case is when we are interested in the top row with empty
> column.
> For example,
> we are interested in row1/cf1:/1/put.
> So we seek to the top row: row1/cf1:/MAX_TS/MAXIMUM. And the delete family
> bloom filter will say there is NO delete family.
> Then it will avoid the top row seek and return a fake kv, which is the last
> kv for this row (createLastOnRowCol).
> In this way, we have already missed the real kv we are interested in.
> The solution for the above problem is to disable this optimization if we are
> trying to GET/SCAN a row with empty column.
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