Return-Path: X-Original-To: archive-asf-public-internal@cust-asf2.ponee.io Delivered-To: archive-asf-public-internal@cust-asf2.ponee.io Received: from cust-asf.ponee.io (cust-asf.ponee.io [163.172.22.183]) by cust-asf2.ponee.io (Postfix) with ESMTP id EDAB2200D49 for ; Fri, 10 Nov 2017 02:28:06 +0100 (CET) Received: by cust-asf.ponee.io (Postfix) id EC3F3160C02; Fri, 10 Nov 2017 01:28:06 +0000 (UTC) Delivered-To: archive-asf-public@cust-asf.ponee.io Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by cust-asf.ponee.io (Postfix) with SMTP id 3E76B160BEF for ; Fri, 10 Nov 2017 02:28:06 +0100 (CET) Received: (qmail 31451 invoked by uid 500); 10 Nov 2017 01:28:05 -0000 Mailing-List: contact notifications-help@accumulo.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: jira@apache.org Delivered-To: mailing list notifications@accumulo.apache.org Received: (qmail 31437 invoked by uid 99); 10 Nov 2017 01:28:05 -0000 Received: from pnap-us-west-generic-nat.apache.org (HELO spamd2-us-west.apache.org) (209.188.14.142) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 10 Nov 2017 01:28:05 +0000 Received: from localhost (localhost [127.0.0.1]) by spamd2-us-west.apache.org (ASF Mail Server at spamd2-us-west.apache.org) with ESMTP id B11511A4168 for ; Fri, 10 Nov 2017 01:28:04 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at spamd2-us-west.apache.org X-Spam-Flag: NO X-Spam-Score: -100.002 X-Spam-Level: X-Spam-Status: No, score=-100.002 tagged_above=-999 required=6.31 tests=[RP_MATCHES_RCVD=-0.001, SPF_PASS=-0.001, USER_IN_WHITELIST=-100] autolearn=disabled Received: from mx1-lw-eu.apache.org ([10.40.0.8]) by localhost (spamd2-us-west.apache.org [10.40.0.9]) (amavisd-new, port 10024) with ESMTP id I76F9H7v0qHA for ; Fri, 10 Nov 2017 01:28:03 +0000 (UTC) Received: from mailrelay1-us-west.apache.org (mailrelay1-us-west.apache.org [209.188.14.139]) by mx1-lw-eu.apache.org (ASF Mail Server at mx1-lw-eu.apache.org) with ESMTP id 9A1CD60F72 for ; Fri, 10 Nov 2017 01:28:03 +0000 (UTC) Received: from jira-lw-us.apache.org (unknown [207.244.88.139]) by mailrelay1-us-west.apache.org (ASF Mail Server at mailrelay1-us-west.apache.org) with ESMTP id 7BD55E02BE for ; Fri, 10 Nov 2017 01:28:02 +0000 (UTC) Received: from jira-lw-us.apache.org (localhost [127.0.0.1]) by jira-lw-us.apache.org (ASF Mail Server at jira-lw-us.apache.org) with ESMTP id C484C23F05 for ; Fri, 10 Nov 2017 01:28:00 +0000 (UTC) Date: Fri, 10 Nov 2017 01:28:00 +0000 (UTC) From: "ASF GitHub Bot (JIRA)" To: notifications@accumulo.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Updated] (ACCUMULO-4641) Modify BlockCache interface to avoid race conditions MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-JIRA-FingerPrint: 30527f35849b9dde25b450d4833f0394 archived-at: Fri, 10 Nov 2017 01:28:07 -0000 [ https://issues.apache.org/jira/browse/ACCUMULO-4641?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ] ASF GitHub Bot updated ACCUMULO-4641: ------------------------------------- Labels: pull-request-available (was: ) > Modify BlockCache interface to avoid race conditions > ---------------------------------------------------- > > Key: ACCUMULO-4641 > URL: https://issues.apache.org/jira/browse/ACCUMULO-4641 > Project: Accumulo > Issue Type: Sub-task > Reporter: Keith Turner > Assignee: Keith Turner > Labels: pull-request-available > Fix For: 2.0.0 > > > Currently the BlockCache interface has functions to get and put. Accumulo will try to get a block, if it does not exist load it, and then put it in the cache. This can lead to race conditions where multiple threads unnecessarily load the same block. > I think it would be better to modify the block cache interface to only have a function like the following. > {code:java} > CacheEntry get(String blockName, BlockLoader loader) > {code} > BlockLoader represents a function that the cache can call if a block is not present. The cache implementation can attempt to handle load race conditions however it likes.. -- This message was sent by Atlassian JIRA (v6.4.14#64029)