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 5BC0A10F3B for ; Thu, 10 Oct 2013 00:23:44 +0000 (UTC) Received: (qmail 1695 invoked by uid 500); 10 Oct 2013 00:23:42 -0000 Delivered-To: apmail-hadoop-hdfs-issues-archive@hadoop.apache.org Received: (qmail 1642 invoked by uid 500); 10 Oct 2013 00:23:42 -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 1557 invoked by uid 99); 10 Oct 2013 00:23:42 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Thu, 10 Oct 2013 00:23:42 +0000 Date: Thu, 10 Oct 2013 00:23:42 +0000 (UTC) From: "Colin Patrick McCabe (JIRA)" To: hdfs-issues@hadoop.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (HDFS-5096) Automatically cache new data added to a cached path 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-5096?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13791035#comment-13791035 ] Colin Patrick McCabe commented on HDFS-5096: -------------------------------------------- Oh, and: this also adds support for caching of directories. As we discussed earlier, it only goes "one deep," caching immediate descendants, but not recursing. > Automatically cache new data added to a cached path > --------------------------------------------------- > > Key: HDFS-5096 > URL: https://issues.apache.org/jira/browse/HDFS-5096 > Project: Hadoop HDFS > Issue Type: Sub-task > Components: datanode, namenode > Reporter: Andrew Wang > Assignee: Colin Patrick McCabe > Attachments: HDFS-5096-caching.005.patch > > > For some applications, it's convenient to specify a path to cache, and have HDFS automatically cache new data added to the path without sending a new caching request or a manual refresh command. > One example is new data appended to a cached file. It would be nice to re-cache a block at the new appended length, and cache new blocks added to the file. > Another example is a cached Hive partition directory, where a user can drop new files directly into the partition. It would be nice if these new files were cached. > In both cases, this automatic caching would happen after the file is closed, i.e. block replica is finalized. -- This message was sent by Atlassian JIRA (v6.1#6144)