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https://issues.apache.org/jira/browse/HBASE-15477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15207587#comment-15207587
]
Hudson commented on HBASE-15477:
--------------------------------
FAILURE: Integrated in HBase-Trunk_matrix #797 (See
[https://builds.apache.org/job/HBase-Trunk_matrix/797/])
HBASE-15477 Purge 'next block header' from cached blocks (stack: rev
ef94b552399d75c0c16aca0109a39b66f15af892)
*
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/KeyValueScanner.java.rej
HBASE-15477 Purge 'next block header' from cached blocks (stack: rev
000117ad9fd7eb59074c9bb0da2cf1f9544d4bed)
*
hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/CacheTestUtils.java
* hbase-common/src/main/java/org/apache/hadoop/hbase/io/hfile/BlockType.java
*
hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/TestHFileWriterV3.java
*
hbase-external-blockcache/src/main/java/org/apache/hadoop/hbase/io/hfile/MemcachedBlockCache.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileBlock.java
*
hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/TestHFileDataBlockEncoder.java
*
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestCacheOnWriteInSchema.java
*
hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/TestCacheOnWrite.java
*
hbase-common/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileContextBuilder.java
*
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileReaderImpl.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileScanner.java
*
hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/TestHFileBlockIndex.java
* hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/TestChecksum.java
*
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/HFileBlockIndex.java
*
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/KeyValueScanner.java
*
hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/TestHFileEncryption.java
* hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/TestPrefetch.java
*
hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/TestHFileBlock.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/ChecksumUtil.java
*
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.java
*
hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/TestHFileBlockCompatibility.java
* hbase-common/src/main/java/org/apache/hadoop/hbase/nio/ByteBuff.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StoreFile.java
> Do not save 'next block header' when we cache hfileblocks
> ---------------------------------------------------------
>
> Key: HBASE-15477
> URL: https://issues.apache.org/jira/browse/HBASE-15477
> Project: HBase
> Issue Type: Sub-task
> Components: BlockCache, Performance
> Reporter: stack
> Assignee: stack
> Fix For: 2.0.0
>
> Attachments: 15366v4.patch, 15477.patch, 15477v2.patch,
> 15477v3.patch, 15477v3.patch, 15477v4.patch
>
>
> When we read from HDFS, we overread to pick up the next blocks header.
> Doing this saves a seek as we move through the hfile; we save having to
> do an explicit seek just to read the block header every time we need to
> read the body. We used to read in the next header as part of the
> current blocks buffer. This buffer was then what got persisted to
> blockcache; so we were over-persisting wrtiting out our block plus the
> next blocks' header (overpersisting 33 bytes). Parse of HFileBlock
> complicated by this extra tail. Fix.
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