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From "Luke Lu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5954) Allow proper fsync support for HBase
Date Sat, 07 Sep 2013 02:06:51 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13760865#comment-13760865
] 

Luke Lu commented on HBASE-5954:
--------------------------------

As you've found out, the fsync performance is very sensitive to the disk controller and its
settings. You need a SATA/SAS controller (RAID or not) with battery or (recently) flash (FBWC
in HP cards, nvcache in Dell cards) backed write cache to get good and safe sync performance
on HDFS as the additional seek to sync the checksum file is really expensive without a write
cache to queue the writes, which calls for HDFS-2699, which I think should be an per file
option.
                
> Allow proper fsync support for HBase
> ------------------------------------
>
>                 Key: HBASE-5954
>                 URL: https://issues.apache.org/jira/browse/HBASE-5954
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>            Priority: Critical
>             Fix For: 0.98.0
>
>         Attachments: 5954-trunk-hdfs-trunk.txt, 5954-trunk-hdfs-trunk-v2.txt, 5954-trunk-hdfs-trunk-v3.txt,
5954-trunk-hdfs-trunk-v4.txt, 5954-trunk-hdfs-trunk-v5.txt, 5954-trunk-hdfs-trunk-v6.txt,
hbase-hdfs-744.txt
>
>
> At least get recommendation into 0.96 doc and some numbers running w/ this hdfs feature
enabled.

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