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 42A3C10129 for ; Wed, 31 Jul 2013 15:33:55 +0000 (UTC) Received: (qmail 3144 invoked by uid 500); 31 Jul 2013 15:33:55 -0000 Delivered-To: apmail-hbase-issues-archive@hbase.apache.org Received: (qmail 2623 invoked by uid 500); 31 Jul 2013 15:33:51 -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 2344 invoked by uid 99); 31 Jul 2013 15:33:49 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 31 Jul 2013 15:33:49 +0000 Date: Wed, 31 Jul 2013 15:33:49 +0000 (UTC) From: "Elliott Clark (JIRA)" To: issues@hbase.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (HBASE-9087) Handlers being blocked during 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/HBASE-9087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13725346#comment-13725346 ] Elliott Clark commented on HBASE-9087: -------------------------------------- Running a ycsb workload e benchmark on this right now. > Handlers being blocked during reads > ----------------------------------- > > Key: HBASE-9087 > URL: https://issues.apache.org/jira/browse/HBASE-9087 > Project: HBase > Issue Type: Bug > Components: Performance > Affects Versions: 0.94.7, 0.95.1 > Reporter: Pablo Medina > Assignee: Elliott Clark > Priority: Critical > Attachments: HBASE-9087-0.patch, HBASE-9087-1.patch > > > I'm having a lot of handlers (90 - 300 aprox) being blocked when reading rows. They are blocked during changedReaderObserver registration. > Lars Hofhansl suggests to change the implementation of changedReaderObserver from CopyOnWriteList to ConcurrentHashMap. > Here is a stack trace: > "IPC Server handler 99 on 60020" daemon prio=10 tid=0x0000000041c84000 nid=0x2244 waiting on condition [0x00007ff51fefd000] > java.lang.Thread.State: WAITING (parking) > at sun.misc.Unsafe.park(Native Method) > - parking to wait for <0x00000000c5c13ae8> (a java.util.concurrent.locks.ReentrantLock$NonfairSync) > at java.util.concurrent.locks.LockSupport.park(LockSupport.java:156) > at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:811) > at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:842) > at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1178) > at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:186) > at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:262) > at java.util.concurrent.CopyOnWriteArrayList.addIfAbsent(CopyOnWriteArrayList.java:553) > at java.util.concurrent.CopyOnWriteArraySet.add(CopyOnWriteArraySet.java:221) > at org.apache.hadoop.hbase.regionserver.Store.addChangedReaderObserver(Store.java:1085) > at org.apache.hadoop.hbase.regionserver.StoreScanner.(StoreScanner.java:138) > at org.apache.hadoop.hbase.regionserver.Store.getScanner(Store.java:2077) > at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.(HRegion.java:3755) > at org.apache.hadoop.hbase.regionserver.HRegion.instantiateRegionScanner(HRegion.java:1804) > at org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1796) > at org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1771) > at org.apache.hadoop.hbase.regionserver.HRegion.get(HRegion.java:4776) > at org.apache.hadoop.hbase.regionserver.HRegion.get(HRegion.java:4750) > at org.apache.hadoop.hbase.regionserver.HRegionServer.get(HRegionServer.java:2152) > at org.apache.hadoop.hbase.regionserver.HRegionServer.multi(HRegionServer.java:3700) > at sun.reflect.GeneratedMethodAccessor26.invoke(Unknown Source) > at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) > at java.lang.reflect.Method.invoke(Method.java:597) > at org.apache.hadoop.hbase.ipc.WritableRpcEngine$Server.call(WritableRpcEngine.java:320) > at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1426) > -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira