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From "Phabricator (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5074) support checksums in HBase block cache
Date Tue, 14 Feb 2012 01:07:01 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13207421#comment-13207421
] 

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

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

INLINE COMMENTS
  src/main/java/org/apache/hadoop/hbase/util/HFileSystem.java:1 I'd suggest yes creating an
fs package.  Maybe FSUtils would move over but an fs package would seem to be a better location
for a new FileSystem implementation than util.
  src/main/java/org/apache/hadoop/hbase/util/HFileSystem.java:49 Interesting.  How does the
master bootstrap the cluster then?  It writes into the fs the root and meta regions?

REVISION DETAIL
  https://reviews.facebook.net/D1521

                
> 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
>         Attachments: D1521.1.patch, D1521.1.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
>
>
> 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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