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https://issues.apache.org/jira/browse/HBASE-5074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13222899#comment-13222899
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Phabricator commented on HBASE-5074:
------------------------------------
mbautin has accepted the revision "[jira] [HBASE-5074] Support checksums in
HBase block cache".
@dhruba: looks good! A few minor comments inline.
Also, I still think there is some code duplication between TestHFileBlock and
TestHFileBlockCompatibility that we could get rid of, but we can do that in a
separate patch.
Could you please attach the final patch to the JIRA and run it on Hadoop QA?
INLINE COMMENTS
src/main/java/org/apache/hadoop/hbase/io/hfile/AbstractHFileReader.java:48
s/do do/do/
src/main/java/org/apache/hadoop/hbase/io/hfile/HFileBlock.java:1242 do do ->
do
src/test/java/org/apache/hadoop/hbase/io/hfile/TestHFileBlockCompatibility.java:161-174
It would be great to factor out the common part of this hard-coded gzip blob
so that it is not repeated in TestHFileBlock and here.
This is an example of what I meant in my comment regarding code duplication.
Alternatively, we can remove code duplication in a follow-up patch.
REVISION DETAIL
https://reviews.facebook.net/D1521
BRANCH
svn
> support checksums in HBase block cache
> --------------------------------------
>
> Key: HBASE-5074
> URL: https://issues.apache.org/jira/browse/HBASE-5074
> Project: HBase
> Issue Type: Improvement
> Components: regionserver
> Reporter: dhruba borthakur
> Assignee: dhruba borthakur
> Fix For: 0.94.0
>
> Attachments: D1521.1.patch, D1521.1.patch, D1521.10.patch,
> D1521.10.patch, D1521.10.patch, D1521.10.patch, D1521.10.patch,
> D1521.11.patch, D1521.11.patch, D1521.12.patch, D1521.12.patch,
> D1521.2.patch, D1521.2.patch, D1521.3.patch, D1521.3.patch, D1521.4.patch,
> D1521.4.patch, D1521.5.patch, D1521.5.patch, D1521.6.patch, D1521.6.patch,
> D1521.7.patch, D1521.7.patch, D1521.8.patch, D1521.8.patch, D1521.9.patch,
> D1521.9.patch
>
>
> The current implementation of HDFS stores the data in one block file and the
> metadata(checksum) in another block file. This means that every read into the
> HBase block cache actually consumes two disk iops, one to the datafile and
> one to the checksum file. This is a major problem for scaling HBase, because
> HBase is usually bottlenecked on the number of random disk iops that the
> storage-hardware offers.
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