Return-Path: X-Original-To: apmail-hadoop-hdfs-issues-archive@minotaur.apache.org Delivered-To: apmail-hadoop-hdfs-issues-archive@minotaur.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id B339FF962 for ; Tue, 1 Oct 2013 16:03:35 +0000 (UTC) Received: (qmail 11748 invoked by uid 500); 1 Oct 2013 16:03:31 -0000 Delivered-To: apmail-hadoop-hdfs-issues-archive@hadoop.apache.org Received: (qmail 11676 invoked by uid 500); 1 Oct 2013 16:03:29 -0000 Mailing-List: contact hdfs-issues-help@hadoop.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: hdfs-issues@hadoop.apache.org Delivered-To: mailing list hdfs-issues@hadoop.apache.org Received: (qmail 11622 invoked by uid 99); 1 Oct 2013 16:03:28 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 01 Oct 2013 16:03:28 +0000 Date: Tue, 1 Oct 2013 16:03:28 +0000 (UTC) From: "Tsz Wo (Nicholas), SZE (JIRA)" To: hdfs-issues@hadoop.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Updated] (HDFS-5285) Flatten INodeFile hierarchy MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 [ https://issues.apache.org/jira/browse/HDFS-5285?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Tsz Wo (Nicholas), SZE updated HDFS-5285: ----------------------------------------- Attachment: h5285_20131001.patch h5285_20131001.patch: preliminary patch which does not compile. Still need to fix the file with snapshot case. > Flatten INodeFile hierarchy > --------------------------- > > Key: HDFS-5285 > URL: https://issues.apache.org/jira/browse/HDFS-5285 > Project: Hadoop HDFS > Issue Type: Sub-task > Components: namenode > Reporter: Tsz Wo (Nicholas), SZE > Assignee: Tsz Wo (Nicholas), SZE > Attachments: h5285_20131001.patch > > > For files, there are INodeFile, INodeFileUnderConstruction, INodeFileWithSnapshot and INodeFileUnderConstructionWithSnapshot for representing whether a file is under construction or whether it is in some snapshot. The following are two major problems of the current approach: > - Java class does not support multiple inheritances so that INodeFileUnderConstructionWithSnapshot cannot extend both INodeFileUnderConstruction and INodeFileWithSnapshot. > - The number of classes is exponential to the number of features. Currently, there are only two features, UnderConstruction and WithSnapshot. The number of classes is 2^2 = 4. It is hard to add one more feature since the number of classes will become 2^3 = 8. -- This message was sent by Atlassian JIRA (v6.1#6144)