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Posted to hdfs-dev@hadoop.apache.org by "Todd Lipcon (Created) (JIRA)" <ji...@apache.org> on 2011/09/28 11:04:45 UTC
[jira] [Created] (HDFS-2379) 0.20: Allow block reports to proceed
without holding FSDataset lock
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: 0.20.206.0
Reporter: Todd Lipcon
Priority: Critical
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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[jira] [Resolved] (HDFS-2379) 0.20: Allow block reports to proceed
without holding FSDataset lock
Posted by "Suresh Srinivas (Resolved) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HDFS-2379?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Suresh Srinivas resolved HDFS-2379.
-----------------------------------
Resolution: Fixed
Fix Version/s: 1.0.1
Matt, I merged the changes from branch 1 to 1.0.
> 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: 1.1.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Critical
> Fix For: 1.1.0, 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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[jira] [Reopened] (HDFS-2379) 0.20: Allow block reports to proceed
without holding FSDataset lock
Posted by "Matt Foley (Reopened) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HDFS-2379?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Matt Foley reopened HDFS-2379:
------------------------------
There's been a request to include this in 1.0.1, but the patch doesn't apply; it conflicts with another patch on several files.
Todd, would you be able to look at making the patch work in branch-1.0, please?
> 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: 1.1.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Critical
> Fix For: 1.1.0
>
> 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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[jira] [Resolved] (HDFS-2379) 0.20: Allow block reports to proceed
without holding FSDataset lock
Posted by "Todd Lipcon (Resolved) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HDFS-2379?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Todd Lipcon resolved HDFS-2379.
-------------------------------
Resolution: Fixed
Fix Version/s: 0.20.206.0
Hadoop Flags: Reviewed
Committed to 0.20-security. Thanks for the reviews, Suresh.
> 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: 0.20.206.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Critical
> Fix For: 0.20.206.0
>
> 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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