[ http://issues.apache.org/jira/browse/HADOOP-50?page=comments#action_12371869 ]
Andrzej Bialecki commented on HADOOP-50: ----------------------------------------- I think this is a valid concern. Most filesystems work poorly with thousands of files in a single directory. My recent tests on ext3 show that listing the data directory with 50,000 blocks takes several seconds. FSDataset:80 contains a commented out section, which seems to address this issue. Anyone knows why it's not used? > dfs datanode should store blocks in multiple directories > -------------------------------------------------------- > > Key: HADOOP-50 > URL: http://issues.apache.org/jira/browse/HADOOP-50 > Project: Hadoop > Type: Bug > Components: dfs > Versions: 0.2 > Reporter: Doug Cutting > Assignee: Mike Cafarella > Fix For: 0.2 > > The datanode currently stores all file blocks in a single directory. With > 32MB blocks and terabyte filesystems, this will create too many files in a > single directory for many filesystems. Thus blocks should be stored in > multiple directories, perhaps even a shallow hierarchy. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
