Return-Path: X-Original-To: apmail-hbase-issues-archive@www.apache.org Delivered-To: apmail-hbase-issues-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 3B7389430 for ; Tue, 3 Jan 2012 19:37:29 +0000 (UTC) Received: (qmail 44539 invoked by uid 500); 3 Jan 2012 19:37:29 -0000 Delivered-To: apmail-hbase-issues-archive@hbase.apache.org Received: (qmail 44509 invoked by uid 500); 3 Jan 2012 19:37:29 -0000 Mailing-List: contact issues-help@hbase.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Delivered-To: mailing list issues@hbase.apache.org Received: (qmail 44492 invoked by uid 99); 3 Jan 2012 19:37:28 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 03 Jan 2012 19:37:28 +0000 X-ASF-Spam-Status: No, hits=-2001.6 required=5.0 tests=ALL_TRUSTED,RP_MATCHES_RCVD X-Spam-Check-By: apache.org Received: from [140.211.11.116] (HELO hel.zones.apache.org) (140.211.11.116) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 03 Jan 2012 19:37:27 +0000 Received: from hel.zones.apache.org (hel.zones.apache.org [140.211.11.116]) by hel.zones.apache.org (Postfix) with ESMTP id CB26813665B for ; Tue, 3 Jan 2012 19:36:42 +0000 (UTC) Date: Tue, 3 Jan 2012 19:36:42 +0000 (UTC) From: "Phabricator (Updated) (JIRA)" To: issues@hbase.apache.org Message-ID: <610514712.1642.1325619402833.JavaMail.tomcat@hel.zones.apache.org> In-Reply-To: <657671452.46177.1313609127186.JavaMail.tomcat@hel.zones.apache.org> Subject: [jira] [Updated] (HBASE-4218) Data Block Encoding of KeyValues (aka delta encoding / prefix compression) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 [ https://issues.apache.org/jira/browse/HBASE-4218?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Phabricator updated HBASE-4218: ------------------------------- Attachment: D447.17.patch mbautin updated the revision "[jira] [HBASE-4218] HFile data block encoding framework and delta encoding implementation". Reviewers: JIRA, tedyu, stack, nspiegelberg, Kannan Added another unit test doing a mini-cluster load test with data block encoding turned on. That helped find some bugs similar to those that I observed in 5-node cluster testing, and I added a smaller test reproducing the same bugs (TestEncodedSeekers). Fixed those bugs by correctly restoring additional state when going to previous key/value (previously, only the vanilla BufferedDataBlockEncoder.SeekerState was restored but not algorithm-specific state). I also had to remove BitsetKeyDeltaEncoder for now because I could not fix its encoded seeker yet (it seemed to have some more complicated bugs) but we are not planning to use that algorithm for now. Also, fixed the most recent comment by Ted and TestHFileBlock.testBlockHeapSize failure on a 32-bit JVM (thanks to Ted for pointing that out, too). REVISION DETAIL https://reviews.facebook.net/D447 AFFECTED FILES src/main/java/org/apache/hadoop/hbase/HColumnDescriptor.java src/main/java/org/apache/hadoop/hbase/HConstants.java src/main/java/org/apache/hadoop/hbase/KeyValue.java src/main/java/org/apache/hadoop/hbase/io/HalfStoreFileReader.java src/main/java/org/apache/hadoop/hbase/io/encoding/BufferedDataBlockEncoder.java src/main/java/org/apache/hadoop/hbase/io/encoding/CompressionState.java src/main/java/org/apache/hadoop/hbase/io/encoding/CopyKeyDataBlockEncoder.java src/main/java/org/apache/hadoop/hbase/io/encoding/DataBlockEncoder.java src/main/java/org/apache/hadoop/hbase/io/encoding/DataBlockEncoding.java src/main/java/org/apache/hadoop/hbase/io/encoding/DiffKeyDeltaEncoder.java src/main/java/org/apache/hadoop/hbase/io/encoding/EncodedDataBlock.java src/main/java/org/apache/hadoop/hbase/io/encoding/EncoderBufferTooSmallException.java src/main/java/org/apache/hadoop/hbase/io/encoding/FastDiffDeltaEncoder.java src/main/java/org/apache/hadoop/hbase/io/encoding/PrefixKeyDeltaEncoder.java src/main/java/org/apache/hadoop/hbase/io/hfile/AbstractHFileReader.java src/main/java/org/apache/hadoop/hbase/io/hfile/AbstractHFileWriter.java src/main/java/org/apache/hadoop/hbase/io/hfile/BlockType.java src/main/java/org/apache/hadoop/hbase/io/hfile/HFile.java src/main/java/org/apache/hadoop/hbase/io/hfile/HFileBlock.java src/main/java/org/apache/hadoop/hbase/io/hfile/HFileBlockIndex.java src/main/java/org/apache/hadoop/hbase/io/hfile/HFileDataBlockEncoder.java src/main/java/org/apache/hadoop/hbase/io/hfile/HFileDataBlockEncoderImpl.java src/main/java/org/apache/hadoop/hbase/io/hfile/HFilePrettyPrinter.java src/main/java/org/apache/hadoop/hbase/io/hfile/HFileReaderV1.java src/main/java/org/apache/hadoop/hbase/io/hfile/HFileReaderV2.java src/main/java/org/apache/hadoop/hbase/io/hfile/HFileWriterV1.java src/main/java/org/apache/hadoop/hbase/io/hfile/HFileWriterV2.java src/main/java/org/apache/hadoop/hbase/io/hfile/NoOpDataBlockEncoder.java src/main/java/org/apache/hadoop/hbase/mapreduce/LoadIncrementalHFiles.java src/main/java/org/apache/hadoop/hbase/regionserver/CompactSplitThread.java src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java src/main/java/org/apache/hadoop/hbase/regionserver/MemStore.java src/main/java/org/apache/hadoop/hbase/regionserver/Store.java src/main/java/org/apache/hadoop/hbase/regionserver/StoreFile.java src/main/java/org/apache/hadoop/hbase/regionserver/StoreFileScanner.java src/main/java/org/apache/hadoop/hbase/regionserver/metrics/SchemaConfigured.java src/main/java/org/apache/hadoop/hbase/util/ByteBufferUtils.java src/main/ruby/hbase/admin.rb src/test/java/org/apache/hadoop/hbase/BROKE_TODO_FIX_TestAcidGuarantees.java src/test/java/org/apache/hadoop/hbase/HBaseTestCase.java src/test/java/org/apache/hadoop/hbase/HBaseTestingUtility.java src/test/java/org/apache/hadoop/hbase/HFilePerformanceEvaluation.java src/test/java/org/apache/hadoop/hbase/TestAcidGuarantees.java src/test/java/org/apache/hadoop/hbase/client/TestAdmin.java src/test/java/org/apache/hadoop/hbase/client/TestFromClientSide.java src/test/java/org/apache/hadoop/hbase/io/TestHalfStoreFileReader.java src/test/java/org/apache/hadoop/hbase/io/TestHeapSize.java src/test/java/org/apache/hadoop/hbase/io/encoding/RedundantKVGenerator.java src/test/java/org/apache/hadoop/hbase/io/encoding/TestBufferedDataBlockEncoder.java src/test/java/org/apache/hadoop/hbase/io/encoding/TestDataBlockEncoders.java src/test/java/org/apache/hadoop/hbase/io/encoding/TestEncodedSeekers.java src/test/java/org/apache/hadoop/hbase/io/hfile/CacheTestUtils.java src/test/java/org/apache/hadoop/hbase/io/hfile/TestCacheOnWrite.java src/test/java/org/apache/hadoop/hbase/io/hfile/TestHFileBlock.java src/test/java/org/apache/hadoop/hbase/io/hfile/TestHFileBlockIndex.java src/test/java/org/apache/hadoop/hbase/io/hfile/TestHFileDataBlockEncoder.java src/test/java/org/apache/hadoop/hbase/io/hfile/TestHFileWriterV2.java src/test/java/org/apache/hadoop/hbase/mapreduce/TestImportExport.java src/test/java/org/apache/hadoop/hbase/regionserver/CreateRandomStoreFile.java src/test/java/org/apache/hadoop/hbase/regionserver/DataBlockEncodingTool.java src/test/java/org/apache/hadoop/hbase/regionserver/EncodedSeekPerformanceTest.java src/test/java/org/apache/hadoop/hbase/regionserver/TestCompactSelection.java src/test/java/org/apache/hadoop/hbase/regionserver/TestCompaction.java src/test/java/org/apache/hadoop/hbase/regionserver/TestCompoundBloomFilter.java src/test/java/org/apache/hadoop/hbase/regionserver/TestFSErrorsExposed.java src/test/java/org/apache/hadoop/hbase/regionserver/TestMultiColumnScanner.java src/test/java/org/apache/hadoop/hbase/regionserver/TestScanWithBloomError.java src/test/java/org/apache/hadoop/hbase/regionserver/TestSeekOptimizations.java src/test/java/org/apache/hadoop/hbase/regionserver/TestStoreFile.java src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestLogRolling.java src/test/java/org/apache/hadoop/hbase/regionserver/wal/TestWALReplay.java src/test/java/org/apache/hadoop/hbase/util/LoadTestTool.java src/test/java/org/apache/hadoop/hbase/util/MultiThreadedWriter.java src/test/java/org/apache/hadoop/hbase/util/RestartMetaTest.java src/test/java/org/apache/hadoop/hbase/util/TestByteBufferUtils.java src/test/java/org/apache/hadoop/hbase/util/TestMiniClusterLoadEncoded.java src/test/java/org/apache/hadoop/hbase/util/TestMiniClusterLoadParallel.java src/test/java/org/apache/hadoop/hbase/util/TestMiniClusterLoadSequential.java > Data Block Encoding of KeyValues (aka delta encoding / prefix compression) > --------------------------------------------------------------------------- > > Key: HBASE-4218 > URL: https://issues.apache.org/jira/browse/HBASE-4218 > Project: HBase > Issue Type: Improvement > Components: io > Affects Versions: 0.94.0 > Reporter: Jacek Migdal > Assignee: Mikhail Bautin > Labels: compression > Fix For: 0.94.0 > > Attachments: 0001-Delta-encoding-fixed-encoded-scanners.patch, 0001-Delta-encoding.patch, 4218-v16.txt, D447.1.patch, D447.10.patch, D447.11.patch, D447.12.patch, D447.13.patch, D447.14.patch, D447.15.patch, D447.16.patch, D447.17.patch, D447.2.patch, D447.3.patch, D447.4.patch, D447.5.patch, D447.6.patch, D447.7.patch, D447.8.patch, D447.9.patch, Data-block-encoding-2011-12-23.patch, Delta-encoding.patch-2011-12-22_11_52_07.patch, Delta_encoding_with_memstore_TS.patch, open-source.diff > > > A compression for keys. Keys are sorted in HFile and they are usually very similar. Because of that, it is possible to design better compression than general purpose algorithms, > It is an additional step designed to be used in memory. It aims to save memory in cache as well as speeding seeks within HFileBlocks. It should improve performance a lot, if key lengths are larger than value lengths. For example, it makes a lot of sense to use it when value is a counter. > Initial tests on real data (key length = ~ 90 bytes , value length = 8 bytes) shows that I could achieve decent level of compression: > key compression ratio: 92% > total compression ratio: 85% > LZO on the same data: 85% > LZO after delta encoding: 91% > While having much better performance (20-80% faster decompression ratio than LZO). Moreover, it should allow far more efficient seeking which should improve performance a bit. > It seems that a simple compression algorithms are good enough. Most of the savings are due to prefix compression, int128 encoding, timestamp diffs and bitfields to avoid duplication. That way, comparisons of compressed data can be much faster than a byte comparator (thanks to prefix compression and bitfields). > In order to implement it in HBase two important changes in design will be needed: > -solidify interface to HFileBlock / HFileReader Scanner to provide seeking and iterating; access to uncompressed buffer in HFileBlock will have bad performance > -extend comparators to support comparison assuming that N first bytes are equal (or some fields are equal) > Link to a discussion about something similar: > http://search-hadoop.com/m/5aqGXJEnaD1/hbase+windows&subj=Re+prefix+compression -- This message is automatically generated by JIRA. 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