Colin Patrick McCabe created HDFS-4461: ------------------------------------------
Summary: DirectoryScanner: volume path prefix takes up memory for every block that is scanned Key: HDFS-4461 URL: https://issues.apache.org/jira/browse/HDFS-4461 Project: Hadoop HDFS Issue Type: Improvement Affects Versions: 2.0.3-alpha Reporter: Colin Patrick McCabe Assignee: Colin Patrick McCabe Priority: Minor Attachments: 002.patch In the {{DirectoryScanner}}, we create a class {{ScanInfo}} for every block. This object contains two File objects-- one for the metadata file, and one for the block file. Since those File objects contain full paths, users who pick a lengthly path for their volume roots will end up using an extra N_blocks * path_prefix bytes per block scanned. We also don't really need to store File objects-- storing strings and then creating File objects as needed would be cheaper. This has been causing out-of-memory conditions for users who pick such long volume paths. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira