[ https://issues.apache.org/jira/browse/HBASE-4532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13128256#comment-13128256 ]
jirapos...@reviews.apache.org commented on HBASE-4532: ------------------------------------------------------ ----------------------------------------------------------- This is an automatically generated e-mail. To reply, visit: https://reviews.apache.org/r/2393/ ----------------------------------------------------------- (Updated 2011-10-15 18:33:14.858552) 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) ------- 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. 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 ----- 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 ------- 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira