[jira] [Commented] (HBASE-5954) Allow proper fsync support for HBase

["Luke Lu (JIRA)" <ji...@apache.org>]

    [ 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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