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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-866) Blocking for ten minutes at a time
Date Fri, 05 Sep 2008 20:40:44 GMT

     [ https://issues.apache.org/jira/browse/HBASE-866?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack updated HBASE-866:
------------------------

    Priority: Minor  (was: Major)

Ok. This issue is not as bad as I thought.   I had hbase.hregion.memcache.block.multiplier
set to 1 -- and optional flushes to every ten minutes -- so was seeing loads of blocking.
 Downgrading to minor.  The possibility for our blocking forever is still there so needs to
be fixed; its just not too likely.  Have been able to load up a 4 node cluster w/ 1/4B rows
using default heap sizes with about 300 regions per server without my MR loader failing a
single task.

> Blocking for ten minutes at a time
> ----------------------------------
>
>                 Key: HBASE-866
>                 URL: https://issues.apache.org/jira/browse/HBASE-866
>             Project: Hadoop HBase
>          Issue Type: Bug
>            Reporter: stack
>            Priority: Minor
>
> I've been testing running biggish MR jobs uploading into hbase.  My jobs consistently
fail with child task timing out its ten minute period.  Adding logging, was able to see that
we're actual stuck in a commit.  Following the thread of the row we're committing, I see this
in the log:
> {code}
> ...
> 2008-09-03 18:37:03,446 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Flush requested
on TestTable,0029377106,1220466998108
> 2008-09-03 18:37:03,446 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Started memcache
flush for region TestTable,0029377106,1220466998108. Current region memcache size 64.0m
> 2008-09-03 18:37:03,446 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates
for 'IPC Server handler 1 on 60020' on region TestTable,0029377106,1220466998108: Memcache
size 64.0m is >= than blocking 64.0m size
> 2008-09-03 18:37:13,450 INFO org.apache.hadoop.hbase.regionserver.HRegion: Unblocking
updates for region TestTable,0029377106,1220466998108 'IPC Server handler 1 on 60020'
> 2008-09-03 18:37:16,089 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates
for 'IPC Server handler 16 on 60020' on region TestTable,0029377106,1220466998108: Memcache
size 64.0m is >= than blocking 64.0m size
> 2008-09-03 18:37:16,090 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates
for 'IPC Server handler 1 on 60020' on region TestTable,0029377106,1220466998108: Memcache
size 64.0m is >= than blocking 64.0m size
> 2008-09-03 18:37:16,090 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates
for 'IPC Server handler 4 on 60020' on region TestTable,0029377106,1220466998108: Memcache
size 64.0m is >= than blocking 64.0m size
> 2008-09-03 18:37:16,090 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates
for 'IPC Server handler 6 on 60020' on region TestTable,0029377106,1220466998108: Memcache
size 64.0m is >= than blocking 64.0m size
> 2008-09-03 18:37:16,090 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates
for 'IPC Server handler 2 on 60020' on region TestTable,0029377106,1220466998108: Memcache
size 64.0m is >= than blocking 64.0m size
> 2008-09-03 18:37:16,090 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates
for 'IPC Server handler 12 on 60020' on region TestTable,0029377106,1220466998108: Memcache
size 64.0m is >= than blocking 64.0m size
> 2008-09-03 18:37:16,090 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates
for 'IPC Server handler 9 on 60020' on region TestTable,0029377106,1220466998108: Memcache
size 64.0m is >= than blocking 64.0m size
> 2008-09-03 18:37:16,091 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates
for 'IPC Server handler 7 on 60020' on region TestTable,0029377106,1220466998108: Memcache
size 64.0m is >= than blocking 64.0m size
> 2008-09-03 18:37:21,984 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Finished
memcache flush for region TestTable,0029377106,1220466998108 in 18538ms, sequence id=2852547,
compaction requested=false
> 2008-09-03 18:47:06,241 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Started memcache
flush for region TestTable,0029377106,1220466998108. Current region memcache size 64.0m
> 2008-09-03 18:47:10,031 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Finished
memcache flush for region TestTable,0029377106,1220466998108 in 3790ms, sequence id=2919208,
compaction requested=true
> 2008-09-03 18:47:10,031 INFO org.apache.hadoop.hbase.regionserver.HRegion: Unblocking
updates for region TestTable,0029377106,1220466998108 'IPC Server handler 9 on 60020'
> 2008-09-03 18:47:10,031 DEBUG org.apache.hadoop.hbase.regionserver.CompactSplitThread:
Compaction requested for region: TestTable,0029377106,1220466998108
> 2008-09-03 18:47:10,031 INFO org.apache.hadoop.hbase.regionserver.HRegion: Unblocking
updates for region TestTable,0029377106,1220466998108 'IPC Server handler 12 on 60020'
> 2008-09-03 18:47:10,032 INFO org.apache.hadoop.hbase.regionserver.HRegion: starting compaction
on region TestTable,0029377106,1220466998108
> 2008-09-03 18:47:10,032 INFO org.apache.hadoop.hbase.regionserver.HRegion: Unblocking
updates for region TestTable,0029377106,1220466998108 'IPC Server handler 7 on 60020'
> 2008-09-03 18:47:10,035 INFO org.apache.hadoop.hbase.regionserver.HRegion: Unblocking
updates for region TestTable,0029377106,1220466998108 'IPC Server handler 6 on 60020'
> 2008-09-03 18:47:10,035 INFO org.apache.hadoop.hbase.regionserver.HRegion: Unblocking
updates for region TestTable,0029377106,1220466998108 'IPC Server handler 4 on 60020'
> 2008-09-03 18:47:10,035 INFO org.apache.hadoop.hbase.regionserver.HRegion: Unblocking
updates for region TestTable,0029377106,1220466998108 'IPC Server handler 2 on 60020'
> 2008-09-03 18:47:10,037 INFO org.apache.hadoop.hbase.regionserver.HRegion: Unblocking
updates for region TestTable,0029377106,1220466998108 'IPC Server handler 16 on 60020'
> 2008-09-03 18:47:10,043 INFO org.apache.hadoop.hbase.regionserver.HRegion: Unblocking
updates for region TestTable,0029377106,1220466998108 'IPC Server handler 1 on 60020'
> 2008-09-03 18:47:18,403 INFO org.apache.hadoop.hbase.regionserver.HRegion: compaction
completed on region TestTable,0029377106,1220466998108 in 8sec
> ...
> {code}
> Notice how we're blocked for ten minutes until new flush runs.  My guess is that the
flush that is going on concurrent with the blocking is clearing the flag 

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