Return-Path: X-Original-To: apmail-hbase-issues-archive@www.apache.org Delivered-To: apmail-hbase-issues-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 5997B10B4B for ; Fri, 6 Dec 2013 19:25:46 +0000 (UTC) Received: (qmail 7798 invoked by uid 500); 6 Dec 2013 19:25:45 -0000 Delivered-To: apmail-hbase-issues-archive@hbase.apache.org Received: (qmail 7763 invoked by uid 500); 6 Dec 2013 19:25:45 -0000 Mailing-List: contact issues-help@hbase.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Delivered-To: mailing list issues@hbase.apache.org Received: (qmail 7724 invoked by uid 99); 6 Dec 2013 19:25:45 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 06 Dec 2013 19:25:45 +0000 Date: Fri, 6 Dec 2013 19:25:45 +0000 (UTC) From: "Mikhail Bautin (JIRA)" To: issues@hbase.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (HBASE-10089) Metrics intern table names cause eventual permgen OOM in 0.94 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/HBASE-10089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13841579#comment-13841579 ] Mikhail Bautin commented on HBASE-10089: ---------------------------------------- Getting rid of intern() is fine with me. The original motivation was to reduce memory usage. The fact that interned strings strings are not garbage-collected (at least according to http://stackoverflow.com/questions/2431540/garbage-collection-behaviour-for-string-intern ) and the use case of creating temporary tables for integration testing sound like good reasons to remove intern(). > Metrics intern table names cause eventual permgen OOM in 0.94 > ------------------------------------------------------------- > > Key: HBASE-10089 > URL: https://issues.apache.org/jira/browse/HBASE-10089 > Project: HBase > Issue Type: Bug > Affects Versions: 0.94.0, 0.94.14 > Reporter: Dave Latham > Priority: Minor > > As part of the metrics system introduced in HBASE-4768 there are two places that hbase uses String interning ( SchemaConfigured and SchemaMetrics ). This includes interning table names. We have long running environment where we run regular integration tests on our application using hbase. Those tests create and drop tables with new names regularly. These leads to filling up the permgen with interned table names. Workaround is to periodically restart the region servers. -- This message was sent by Atlassian JIRA (v6.1#6144)