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 A669D10E63 for ; Fri, 14 Feb 2014 09:15:26 +0000 (UTC) Received: (qmail 63039 invoked by uid 500); 14 Feb 2014 09:15:25 -0000 Delivered-To: apmail-hbase-issues-archive@hbase.apache.org Received: (qmail 62680 invoked by uid 500); 14 Feb 2014 09:15:23 -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 62474 invoked by uid 99); 14 Feb 2014 09:15:21 -0000 Received: from arcas.apache.org (HELO arcas.apache.org) (140.211.11.28) by apache.org (qpsmtpd/0.29) with ESMTP; Fri, 14 Feb 2014 09:15:21 +0000 Date: Fri, 14 Feb 2014 09:15:21 +0000 (UTC) From: "ramkrishna.s.vasudevan (JIRA)" To: issues@hbase.apache.org Message-ID: In-Reply-To: References: Subject: [jira] [Commented] (HBASE-10499) In write heavy scenario one of the regions does not get flushed causing RegionTooBusyException 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-10499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13901260#comment-13901260 ] ramkrishna.s.vasudevan commented on HBASE-10499: ------------------------------------------------ That is where i doubt that the memstoreSize is getting calculated wrong. Because once a flush is requested the flusher thread would try to handle it and if it is not able to flush then it would just ignore and there are no logs in that flow if you see. Again it is a guess. Or is there any reason why the region is not flushed from the queue, may be not possible. > In write heavy scenario one of the regions does not get flushed causing RegionTooBusyException > ---------------------------------------------------------------------------------------------- > > Key: HBASE-10499 > URL: https://issues.apache.org/jira/browse/HBASE-10499 > Project: HBase > Issue Type: Bug > Affects Versions: 0.98.0 > Reporter: ramkrishna.s.vasudevan > Assignee: ramkrishna.s.vasudevan > Priority: Critical > Fix For: 0.98.1, 0.99.0 > > Attachments: HBASE-10499.patch, hbase-root-regionserver-ip-10-93-128-92.zip, t1.dump, t2.dump, workloada_0.98.dat > > > I got this while testing 0.98RC. But am not sure if it is specific to this version. Doesn't seem so to me. > Also it is something similar to HBASE-5312 and HBASE-5568. > Using 10 threads i do writes to 4 RS using YCSB. The table created has 200 regions. In one of the run with 0.98 server and 0.98 client I faced this problem like the hlogs became more and the system requested flushes for those many regions. > One by one everything was flushed except one and that one thing remained unflushed. The ripple effect of this on the client side > {code} > com.yahoo.ycsb.DBException: org.apache.hadoop.hbase.client.RetriesExhaustedWithDetailsException: Failed 54 actions: RegionTooBusyException: 54 times, > at com.yahoo.ycsb.db.HBaseClient.cleanup(HBaseClient.java:245) > at com.yahoo.ycsb.DBWrapper.cleanup(DBWrapper.java:73) > at com.yahoo.ycsb.ClientThread.run(Client.java:307) > Caused by: org.apache.hadoop.hbase.client.RetriesExhaustedWithDetailsException: Failed 54 actions: RegionTooBusyException: 54 times, > at org.apache.hadoop.hbase.client.AsyncProcess$BatchErrors.makeException(AsyncProcess.java:187) > at org.apache.hadoop.hbase.client.AsyncProcess$BatchErrors.access$500(AsyncProcess.java:171) > at org.apache.hadoop.hbase.client.AsyncProcess.getErrors(AsyncProcess.java:897) > at org.apache.hadoop.hbase.client.HTable.backgroundFlushCommits(HTable.java:961) > at org.apache.hadoop.hbase.client.HTable.flushCommits(HTable.java:1225) > at com.yahoo.ycsb.db.HBaseClient.cleanup(HBaseClient.java:232) > ... 2 more > {code} > On one of the RS > {code} > 2014-02-11 08:45:58,714 INFO [regionserver60020.logRoller] wal.FSHLog: Too many hlogs: logs=38, maxlogs=32; forcing flush of 23 regions(s): 97d8ae2f78910cc5ded5fbb1ddad8492, d396b8a1da05c871edcb68a15608fdf2, 01a68742a1be3a9705d574ad68fec1d7, 1250381046301e7465b6cf398759378e, 127c133f47d0419bd5ab66675aff76d4, 9f01c5d25ddc6675f750968873721253, 29c055b5690839c2fa357cd8e871741e, ca4e33e3eb0d5f8314ff9a870fc43463, acfc6ae756e193b58d956cb71ccf0aa3, 187ea304069bc2a3c825bc10a59c7e84, 0ea411edc32d5c924d04bf126fa52d1e, e2f9331fc7208b1b230a24045f3c869e, d9309ca864055eddf766a330352efc7a, 1a71bdf457288d449050141b5ff00c69, 0ba9089db28e977f86a27f90bbab9717, fdbb3242d3b673bbe4790a47bc30576f, bbadaa1f0e62d8a8650080b824187850, b1a5de30d8603bd5d9022e09c574501b, cc6a9fabe44347ed65e7c325faa72030, 313b17dbff2497f5041b57fe13fa651e, 6b788c498503ddd3e1433a4cd3fb4e39, 3d71274fe4f815882e9626e1cfa050d1, acc43e4b42c1a041078774f4f20a3ff5 > ...................................................... > 2014-02-11 08:47:49,580 INFO [regionserver60020.logRoller] wal.FSHLog: Too many hlogs: logs=53, maxlogs=32; forcing flush of 2 regions(s): fdbb3242d3b673bbe4790a47bc30576f, 6b788c498503ddd3e1433a4cd3fb4e39 > {code} > {code} > 2014-02-11 09:42:44,237 INFO [regionserver60020.periodicFlusher] regionserver.HRegionServer: regionserver60020.periodicFlusher requesting flush for region usertable,user3654,1392107806977.fdbb3242d3b673bbe4790a47bc30576f. after a delay of 16689 > 2014-02-11 09:42:44,237 INFO [regionserver60020.periodicFlusher] regionserver.HRegionServer: regionserver60020.periodicFlusher requesting flush for region usertable,user6264,1392107806983.6b788c498503ddd3e1433a4cd3fb4e39. after a delay of 15868 > 2014-02-11 09:42:54,238 INFO [regionserver60020.periodicFlusher] regionserver.HRegionServer: regionserver60020.periodicFlusher requesting flush for region usertable,user3654,1392107806977.fdbb3242d3b673bbe4790a47bc30576f. after a delay of 20847 > 2014-02-11 09:42:54,238 INFO [regionserver60020.periodicFlusher] regionserver.HRegionServer: regionserver60020.periodicFlusher requesting flush for region usertable,user6264,1392107806983.6b788c498503ddd3e1433a4cd3fb4e39. after a delay of 20099 > 2014-02-11 09:43:04,238 INFO [regionserver60020.periodicFlusher] regionserver.HRegionServer: regionserver60020.periodicFlusher requesting flush for region usertable,user3654,1392107806977.fdbb3242d3b673bbe4790a47bc30576f. after a delay of 8677 > {code} > {code} > 2014-02-11 10:31:21,020 INFO [regionserver60020.logRoller] wal.FSHLog: Too many hlogs: logs=54, maxlogs=32; forcing flush of 1 regions(s): fdbb3242d3b673bbe4790a47bc30576f > {code} > I restarted another RS and there were region movements with other regions but this region stays with the RS that has this issue. One important observation is that in HRegion.internalflushCache() we need to add a debug log here > {code} > // If nothing to flush, return and avoid logging start/stop flush. > if (this.memstoreSize.get() <= 0) { > return false; > } > {code} > Because we can see that the region is requsted for a flush but it does not happen and no logs related to flush are printed in the logs. so due to some reason this memstore.size() has become 0( I assume this). The earlier bugs were also due to similar reason. -- This message was sent by Atlassian JIRA (v6.1.5#6160)