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From "Phabricator (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5074) support checksums in HBase block cache
Date Tue, 06 Mar 2012 19:14:00 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13223565#comment-13223565
] 

Phabricator commented on HBASE-5074:
------------------------------------

mbautin has commented on the revision "[jira] [HBASE-5074] Support checksums in HBase block
cache".

INLINE COMMENTS
  src/test/java/org/apache/hadoop/hbase/io/hfile/TestHFileBlockCompatibility.java:161-174
What I meant by repeated blob was everything but the last four bytes. We can create a string
constant for that part in TestHFileBlock and reuse it here.

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,
D1521.13.patch, D1521.13.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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