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 887811050A for ; Tue, 14 Jan 2014 01:03:25 +0000 (UTC) Received: (qmail 74153 invoked by uid 500); 14 Jan 2014 01:02:57 -0000 Delivered-To: apmail-hadoop-hdfs-issues-archive@hadoop.apache.org Received: (qmail 74065 invoked by uid 500); 14 Jan 2014 01:02:52 -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 73730 invoked by uid 99); 14 Jan 2014 01:02:36 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 14 Jan 2014 01:02:36 +0000 Date: Tue, 14 Jan 2014 01:02:36 +0000 (UTC) From: "Colin Patrick McCabe (JIRA)" To: hdfs-issues@hadoop.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Updated] (HDFS-5762) BlockReaderLocal doesn't return -1 on EOF when doing zero-length reads 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-5762?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] Colin Patrick McCabe updated HDFS-5762: --------------------------------------- Attachment: HDFS-5762.001.patch > BlockReaderLocal doesn't return -1 on EOF when doing zero-length reads > ---------------------------------------------------------------------- > > Key: HDFS-5762 > URL: https://issues.apache.org/jira/browse/HDFS-5762 > Project: Hadoop HDFS > Issue Type: Bug > Affects Versions: 2.4.0 > Reporter: Colin Patrick McCabe > Assignee: Colin Patrick McCabe > Attachments: HDFS-5762.001.patch > > > Unlike the other block readers, BlockReaderLocal currently doesn't return -1 on EOF when doing zero-length reads. This behavior, in turn, propagates to the DFSInputStream. BlockReaderLocal should do this, so that client can determine whether the file is at an end by doing a zero-length read and checking for -1. > One place this shows up is in libhdfs, which does such a 0-length read to determine if direct (i.e., ByteBuffer) reads are supported. -- This message was sent by Atlassian JIRA (v6.1.5#6160)