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Date: Wed, 11 Jul 2012 22:21:37 +0000 (UTC)
From: "Flavio Junqueira (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <445918223.38464.1342045297014.JavaMail.jiratomcat@issues-vm>
Subject: [jira] [Commented] (HBASE-2315) BookKeeper for write-ahead logging
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    [ https://issues.apache.org/jira/browse/HBASE-2315?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13412065#comment-13412065 ] 

Flavio Junqueira commented on HBASE-2315:
-----------------------------------------

Hi Ted, fs is part of the issue I was discussing before. We don't have a filesystem implementation for bookkeeper, so we can't use the filesystem instance passed.

About the reader and the writer, I was configuring them in the hbase-default configuration file:

{noformat}
<property>
    <name>hbase.regionserver.hlog.reader.impl</name>
    <value>org.apache.hadoop.hbase.regionserver.wal.BookKeeperLogReader</value>
    <description>The HLog file reader implementation.</description>
  </property>
  <property>
    <name>hbase.regionserver.hlog.writer.impl</name>
    <value>org.apache.hadoop.hbase.regionserver.wal.BookKeeperLogWriter</value>
    <description>The HLog file writer implementation.</description>
  </property>
{noformat}

I assumed previously that HLog was instantiated elsewhere.
                
> BookKeeper for write-ahead logging
> ----------------------------------
>
>                 Key: HBASE-2315
>                 URL: https://issues.apache.org/jira/browse/HBASE-2315
>             Project: HBase
>          Issue Type: New Feature
>          Components: regionserver
>            Reporter: Flavio Junqueira
>         Attachments: HBASE-2315.patch, bookkeeperOverview.pdf, zookeeper-dev-bookkeeper.jar
>
>
> BookKeeper, a contrib of the ZooKeeper project, is a fault tolerant and high throughput write-ahead logging service. This issue provides an implementation of write-ahead logging for hbase using BookKeeper. Apart from expected throughput improvements, BookKeeper also has stronger durability guarantees compared to the implementation currently used by hbase.

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