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