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From Akmal Abbasov <akmal.abba...@icloud.com>
Subject Re: HBase snapshots and Compaction
Date Thu, 28 May 2015 09:16:48 GMT
Hi Ted,
Sorry for a late reply.
Here is a snippet from log file
2015-05-28 00:54:39,754 DEBUG [regionserver60020-smallCompactions-1432714643311] regionserver.CompactSplitThread:
CompactSplitThread Status: compaction_queue=(0:27), split_queue=0, merge_queue=0
2015-05-28 00:54:39,754 DEBUG [regionserver60020-smallCompactions-1432714643311] compactions.RatioBasedCompactionPolicy:
Selecting compaction from 4 store files, 0 compacting, 4 eligible, 10 blocking
2015-05-28 00:54:39,755 DEBUG [regionserver60020-smallCompactions-1432714643311] compactions.ExploringCompactionPolicy:
Exploring compaction algorithm has selected 4 files of size 11304175 starting at candidate
#0 after considering 3 permutations with 3 in ratio
2015-05-28 00:54:39,755 DEBUG [regionserver60020-smallCompactions-1432714643311] regionserver.HStore:
3547f43afae5ac3f4e8a162d43a892b4 - s: Initiating major compaction
2015-05-28 00:54:39,755 INFO  [regionserver60020-smallCompactions-1432714643311] regionserver.HRegion:
Starting compaction on s in region metrics,V\xA36\x56\x5E\xC5}\xA1\x43\x00\x32\x00T\x1BU\xE0,1417707276446.3547f43afae5ac3f4e8a162d43a892b4.
2015-05-28 00:54:39,755 INFO  [regionserver60020-smallCompactions-1432714643311] regionserver.HStore:
Starting compaction of 4 file(s) in s of metrics,V\xA36\x56\x5E\xC5}\xA1\x43\x00\x32\x00T\x1BU\xE0,1417707276446.3547f43afae5ac3f4e8a162d43a892b4.
into tmpdir=hdfs://prod1/hbase/data/default/metrics/3547f43afae5ac3f4e8a162d43a892b4/.tmp,
totalSize=10.8 M
2015-05-28 00:54:39,756 DEBUG [regionserver60020-smallCompactions-1432714643311] compactions.Compactor:
Compacting hdfs://prod1/hbase/data/default/metrics/3547f43afae5ac3f4e8a162d43a892b4/s/dab3e768593e44a39097451038c5ebd0,
keycount=3203, bloomtype=ROW, size=10.8 M, encoding=NONE, seqNum=172299974, earliestPutTs=1407941317178
2015-05-28 00:54:39,756 DEBUG [regionserver60020-smallCompactions-1432714643311] compactions.Compactor:
Compacting hdfs://prod1/hbase/data/default/metrics/3547f43afae5ac3f4e8a162d43a892b4/s/2d6472ef99a5478689f7ba822bc407a7,
keycount=4, bloomtype=ROW, size=4.7 K, encoding=NONE, seqNum=172299976, earliestPutTs=1432761158066
2015-05-28 00:54:39,756 DEBUG [regionserver60020-smallCompactions-1432714643311] compactions.Compactor:
Compacting hdfs://prod1/hbase/data/default/metrics/3547f43afae5ac3f4e8a162d43a892b4/s/bdbc806d045740e69ab34e3ea2e113c4,
keycount=6, bloomtype=ROW, size=5.1 K, encoding=NONE, seqNum=172299977, earliestPutTs=1432764757438
2015-05-28 00:54:39,756 DEBUG [regionserver60020-smallCompactions-1432714643311] compactions.Compactor:
Compacting hdfs://prod1/hbase/data/default/metrics/3547f43afae5ac3f4e8a162d43a892b4/s/561f93db484b4b9fb6446152c3eef5b8,
keycount=2, bloomtype=ROW, size=3.8 K, encoding=NONE, seqNum=172299978, earliestPutTs=1432768358747
2015-05-28 00:54:41,881 DEBUG [regionserver60020-smallCompactions-1432714643311] regionserver.HRegionFileSystem:
Committing store file hdfs://prod1/hbase/data/default/metrics/3547f43afae5ac3f4e8a162d43a892b4/.tmp/144f05a9546f446984a5b8fa173dd13e
as hdfs://prod1/hbase/data/default/metrics/3547f43afae5ac3f4e8a162d43a892b4/s/144f05a9546f446984a5b8fa173dd13e
2015-05-28 00:54:41,918 DEBUG [regionserver60020-smallCompactions-1432714643311] regionserver.HStore:
Removing store files after compaction...
2015-05-28 00:54:41,959 DEBUG [regionserver60020-smallCompactions-1432714643311] backup.HFileArchiver:
Finished archiving from class org.apache.hadoop.hbase.backup.HFileArchiver$FileableStoreFile,
file:hdfs://prod1/hbase/data/default/metrics/3547f43afae5ac3f4e8a162d43a892b4/s/dab3e768593e44a39097451038c5ebd0,
to hdfs://prod1/hbase/archive/data/default/metrics/3547f43afae5ac3f4e8a162d43a892b4/s/dab3e768593e44a39097451038c5ebd0
2015-05-28 00:54:42,030 DEBUG [regionserver60020-smallCompactions-1432714643311] backup.HFileArchiver:
Finished archiving from class org.apache.hadoop.hbase.backup.HFileArchiver$FileableStoreFile,
file:hdfs://prod1/hbase/data/default/metrics/3547f43afae5ac3f4e8a162d43a892b4/s/2d6472ef99a5478689f7ba822bc407a7,
to hdfs://prod1/hbase/archive/data/default/metrics/3547f43afae5ac3f4e8a162d43a892b4/s/2d6472ef99a5478689f7ba822bc407a7
2015-05-28 00:54:42,051 DEBUG [regionserver60020-smallCompactions-1432714643311] backup.HFileArchiver:
Finished archiving from class org.apache.hadoop.hbase.backup.HFileArchiver$FileableStoreFile,
file:hdfs://prod1/hbase/data/default/metrics/3547f43afae5ac3f4e8a162d43a892b4/s/bdbc806d045740e69ab34e3ea2e113c4,
to hdfs://prod1/hbase/archive/data/default/metrics/3547f43afae5ac3f4e8a162d43a892b4/s/bdbc806d045740e69ab34e3ea2e113c4
2015-05-28 00:54:42,071 DEBUG [regionserver60020-smallCompactions-1432714643311] backup.HFileArchiver:
Finished archiving from class org.apache.hadoop.hbase.backup.HFileArchiver$FileableStoreFile,
file:hdfs://prod1/hbase/data/default/metrics/3547f43afae5ac3f4e8a162d43a892b4/s/561f93db484b4b9fb6446152c3eef5b8,
to hdfs://prod1/hbase/archive/data/default/metrics/3547f43afae5ac3f4e8a162d43a892b4/s/561f93db484b4b9fb6446152c3eef5b8
2015-05-28 00:54:42,072 INFO  [regionserver60020-smallCompactions-1432714643311] regionserver.HStore:
Completed major compaction of 4 file(s) in s of metrics,V\xA36\x56\x5E\xC5}\xA1\x43\x00\x32\x00T\x1BU\xE0,1417707276446.3547f43afae5ac3f4e8a162d43a892b4.
into 144f05a9546f446984a5b8fa173dd13e(size=10.8 M), total size for store is 10.8 M. This selection
was in queue for 0sec, and took 2sec to execute.
2015-05-28 00:54:42,072 INFO  [regionserver60020-smallCompactions-1432714643311] regionserver.CompactSplitThread:
Completed compaction: Request = regionName=metrics,V\xA36\x56\x5E\xC5}\xA1\x43\x00\x32\x00T\x1BU\xE0,1417707276446.3547f43afae5ac3f4e8a162d43a892b4.,
storeName=s, fileCount=4, fileSize=10.8 M, priority=6, time=1368019430741233; duration=2sec

My question is, why the major compaction was executed instead of minor compaction.
I have this messages all over the log file. 
Thank you!

> On 12 May 2015, at 23:53, Ted Yu <yuzhihong@gmail.com> wrote:
> 
> Can you pastebin major compaction related log snippets ?
> See the following for example of such logs:
> 
> 2015-05-09 10:57:58,961 INFO
> [PriorityRpcServer.handler=13,queue=1,port=16020]
> regionserver.RSRpcServices: Compacting
> IntegrationTestBigLinkedList,\x91\x11\x11\x11\x11\x11\x11\x08,1431193978741.700b34f5d2a3aa10804eff35906fd6d8.
> 2015-05-09 10:57:58,962 DEBUG
> [PriorityRpcServer.handler=13,queue=1,port=16020] regionserver.HStore:
> Skipping expired store file removal due to min version being 1
> 2015-05-09 10:57:58,962 DEBUG
> [PriorityRpcServer.handler=13,queue=1,port=16020]
> compactions.RatioBasedCompactionPolicy: Selecting compaction from 5 store
> files, 0 compacting, 5 eligible, 10 blocking
> 2015-05-09 10:57:58,963 DEBUG
> [PriorityRpcServer.handler=13,queue=1,port=16020] regionserver.HStore:
> 700b34f5d2a3aa10804eff35906fd6d8 - meta: Initiating major compaction (all
> files)
> 
> 
> Cheers
> 
> On Tue, May 12, 2015 at 2:06 PM, Akmal Abbasov <akmal.abbasov@icloud.com>
> wrote:
> 
>> Hi Ted,
>> Thank you for reply.
>> I am running with the default settings.
>> 
>> Sent from my iPhone
>> 
>>> On 12 May 2015, at 22:02, Ted Yu <yuzhihong@gmail.com> wrote:
>>> 
>>> Can you show us compaction related parameters you use ?
>>> 
>>> e.g. hbase.hregion.majorcompaction ,
>> hbase.hregion.majorcompaction.jitter ,
>>> etc
>>> 
>>> On Tue, May 12, 2015 at 9:52 AM, Akmal Abbasov <akmal.abbasov@icloud.com
>>> 
>>> wrote:
>>> 
>>>> HI,
>>>> I am using HBase 0.98.7.
>>>> I am using HBase snapshots to backup data. I create snapshot of tables
>>>> each our.
>>>> Each create snapshot process will cause the flush of the memstore, and
>>>> creation of hfiles.
>>>> When the number of hfiles will reach 3 the MINOR compaction process will
>>>> start for each CF.
>>>> Ok, I was expecting that the compaction will process only small hfiles,
>>>> and I won’t have problems with moving all data to archive folder
>>>> each time after compaction process ends.
>>>> But most of the times, the minor compaction is promoted to major(more
>> than
>>>> 100 in 24 hours without loads).
>>>> As far as I know, the only possibility for this is that all hfiles are
>>>> eligible for compaction.
>>>> But when I tested the archive folder for a CF I see the strange
>> situation
>>>> -rw-r--r--   3 akmal supergroup      1.0 K 2015-05-10 06:04
>>>> 
>> /hbase/archive/data/default/table1/0e8e3bf44a2ea5dfaa8a9c58d99b92e6/c/36dc06f4c34242daadc343d857a35734
>>>> -rw-r--r--   3 akmal supergroup      1.0 K 2015-05-10 06:04
>>>> 
>> /hbase/archive/data/default/table1/0e8e3bf44a2ea5dfaa8a9c58d99b92e6/c/7e8b993f97b84f4594542144f15b0a1e
>>>> -rw-r--r--   3 akmal supergroup      1.1 K 2015-05-10 06:04
>>>> 
>> /hbase/archive/data/default/table1/0e8e3bf44a2ea5dfaa8a9c58d99b92e6/c/b9afc64792ba4bf99a08f34033cc46ac
>>>> -rw-r--r--   3 akmal supergroup    638.4 K 2015-05-10 06:04
>>>> 
>> /hbase/archive/data/default/table1/0e8e3bf44a2ea5dfaa8a9c58d99b92e6/c/dff846ae4fc24d418289a95322b35d46
>>>> -rw-r--r--   3 akmal supergroup      1.0 K 2015-05-10 08:50
>>>> 
>> /hbase/archive/data/default/table1/0e8e3bf44a2ea5dfaa8a9c58d99b92e6/c/228eee22c32e458e8eb7f5d031f64b58
>>>> -rw-r--r--   3 akmal supergroup      1.0 K 2015-05-10 08:50
>>>> 
>> /hbase/archive/data/default/table1/0e8e3bf44a2ea5dfaa8a9c58d99b92e6/c/529257432308466f971e41db49ecffdf
>>>> -rw-r--r--   3 akmal supergroup    638.5 K 2015-05-10 08:50
>>>> 
>> /hbase/archive/data/default/table1/0e8e3bf44a2ea5dfaa8a9c58d99b92e6/c/839d3a6fc523435d8b44f63315fd11b8
>>>> -rw-r--r--   3 akmal supergroup      1.0 K 2015-05-10 08:50
>>>> 
>> /hbase/archive/data/default/table1/0e8e3bf44a2ea5dfaa8a9c58d99b92e6/c/8c245e8661b140439e719f69a535d57f
>>>> -rw-r--r--   3 akmal supergroup      1.0 K 2015-05-10 11:37
>>>> 
>> /hbase/archive/data/default/table1/0e8e3bf44a2ea5dfaa8a9c58d99b92e6/c/23497a31d3e721fe9b63c58fbe0224d5
>>>> -rw-r--r--   3 akmal supergroup    638.7 K 2015-05-10 11:37
>>>> 
>> /hbase/archive/data/default/table1/0e8e3bf44a2ea5dfaa8a9c58d99b92e6/c/8c9af0357d164221ad46b336cd660b30
>>>> -rw-r--r--   3 akmal supergroup      1.0 K 2015-05-10 11:37
>>>> 
>> /hbase/archive/data/default/table1/0e8e3bf44a2ea5dfaa8a9c58d99b92e6/c/8eb55b43c22d434954e2e0bfda656018
>>>> -rw-r--r--   3 akmal supergroup      1.0 K 2015-05-10 11:37
>>>> 
>> /hbase/archive/data/default/table1/0e8e3bf44a2ea5dfaa8a9c58d99b92e6/c/b8b6210d9e6d4ec2344238c6e9c17ddf
>>>> 
>>>> As I understood this files were copied to archive folder after
>> compaction.
>>>> The part I didn’t understand is, why the file with 638 K was also
>> selected
>>>> for compaction?
>>>> Any ideas?
>>>> Thank you.
>>>> 
>>>> Kind regards,
>>>> Akmal Abbasov
>>>> 
>>>> 
>>>> 
>> 


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