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https://issues.apache.org/jira/browse/HBASE-10499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14281212#comment-14281212
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John King commented on HBASE-10499:
-----------------------------------
Hi,Ted
In your v3 patch, you used a strong type conversion, which converted from Delay
to FRE, I think it should be FQE.
> 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: 2.0.0, 1.1.0
>
> Attachments: 10499-v2.txt, 10499-v3.txt, HBASE-10499.patch,
> compaction-queue.png, hbase-root-master-ip-10-157-0-229.zip,
> hbase-root-regionserver-ip-10-93-128-92.zip, master_4e39.log,
> master_576f.log, rs_4e39.log, rs_576f.log, 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.
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