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Posted to hdfs-issues@hadoop.apache.org by "Matt Foley (Closed) (JIRA)" <ji...@apache.org> on 2012/02/06 07:13:59 UTC
[jira] [Closed] (HDFS-2379) 0.20: Allow block reports to proceed
without holding FSDataset lock
[ https://issues.apache.org/jira/browse/HDFS-2379?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Matt Foley closed HDFS-2379.
----------------------------
Closing upon release of 1.0.1.
> 0.20: Allow block reports to proceed without holding FSDataset lock
> -------------------------------------------------------------------
>
> Key: HDFS-2379
> URL: https://issues.apache.org/jira/browse/HDFS-2379
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: data-node
> Affects Versions: 1.0.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Critical
> Fix For: 1.0.1
>
> Attachments: hdfs-2379.txt, hdfs-2379.txt, hdfs-2379.txt, hdfs-2379.txt, hdfs-2379.txt, hdfs-2379.txt
>
>
> As disks are getting larger and more plentiful, we're seeing DNs with multiple millions of blocks on a single machine. When page cache space is tight, block reports can take multiple minutes to generate. Currently, during the scanning of the data directories to generate a report, the FSVolumeSet lock is held. This causes writes and reads to block, timeout, etc, causing big problems especially for clients like HBase.
> This JIRA is to explore some of the ideas originally discussed in HADOOP-4584 for the 0.20.20x series.
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