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compaction failure - HBase - [mail # user]
...Hi, :   I found lots of error saying compaction  failed, does anybody know how  to get around this  problem ?   Jimmy.    2010-06-23 00:01:17,407 DEBUG  org.apache.hadoop.hbase.regionserver.Compact...
...SplitT hread: Compaction requested for region Spam_MsgEventTable,2010-06-22  13:17:04\x0 915e45cc95fa9201b366dc7316dd88438,1277244197913/1155282109 because:  regionserver /
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   Author: Jinsong Hu, 2010-06-23, 21:26
ideas to improve throughput of the base writting - HBase - [mail # user]
...Hi,  There:   While saving lots of data to  on hbase, I noticed that the regionserver  CPU went to more than 100%. examination shows that the hbase CompactSplit is  spending full time...
... working on compacting/splitting  hbase store files. The  machine I have is an 8 core machine. because there is only one comact/split  thread in hbase, only one core is fully used.   I continue...
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   Author: Jinsong Hu, 2010-06-07, 22:52
Re: what is the unit of the TTL in hbase and how often hbase remove expired regions? - HBase - [mail # user]
...I realized that there is a problem.  I read some comments and realized that  the TTL is used when the compaction is executed. that means if there is some regions that has older data...
... then TTL , and no  new data is written to that region, then the old data will never be removed  , because no compaction will ever happen for those data after they are  stored.  Unfortunately...
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   Author: Jinsong Hu, 2010-09-14, 03:05
Re: hbase doesn't delete data older than TTL in old regions - HBase - [mail # user]
..., the major_compaction didn't happen for this table for the last 24 hours.  I realized that I have other tables that have been running for a while and  all I need to do is to check the existing logs...
... , so I checked the major_compaction from their log, and I found that the major_compaction does  happen, but not really every 24 hours. I have seem 2 major compaction happenning within  3 hours...
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   Author: Jinsong Hu, 2010-09-17, 16:59
Re: lack of region merge cause in_memory option trouble - HBase - [mail # user]
... that if I manually run major_compact against the table, it helps a  lot. the older data gets removed. hbase is supposed to run major_compact  every day, but searching from the log, and I found...
... that is not the case. I  have found situations that the major_compact didn't happen for several days.  for the tables with TTL, I found the lack of major_compact greatly impacted the read performance.  after...
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   Author: Jinsong Hu, 2010-09-19, 15:53
Re: ycsb test on hbase - HBase - [mail # user]
...When I did the test, I found the CPU went to 100% for the compaction thread.  while other cores in the OS is not fully utilized. I checked the hbase code and found there is only  one single...
... thread that does compaction. That needs to be changed. I found that 0.21 version of hbase  does have this plan to use multiple thread to do so, but it appears it will take a long time for us...
   Author: Jinsong Hu, 2010-09-10, 17:49
dilemma of memory and CPU for hbase. - HBase - [mail # user]
... does minor compaction and the CPU usage is very high, It also  blocks the heavy client record insertion.    So now I am limited on one side by memory,  limited on another size by  CPU...
   Author: Jinsong Hu, 2010-07-01, 18:52
Re: regionserver crash under heavy load - HBase - [mail # user]
...=287,  storefi leIndexSize=54, memstoreSize=489, compactionQueueSize=1, usedHeap=488,  maxHeap=2 043, blockCacheSize=5800680, blockCacheFree=422830968, blockCacheCount=244,  bloc k...
...Size=489, compactionQueueSize=1, usedHeap=491,  maxHeap=204 3, blockCacheSize=5800680, blockCacheFree=422830968, blockCacheCount=244,  blockC acheHitRatio=29  I logged all gc and the longest gc...
   Author: Jinsong Hu, 2010-07-13, 22:28
Re: memory usage too high in regionserver - HBase - [mail # user]
...you are right. now it shows up as  request=180.5, regions=60, stores=61, storefiles=67, storefileIndexSize=143,  memstoreSize=20, compactionQueueSize=0, usedHeap=1417, maxHeap=6127,  block...
   Author: Jinsong Hu, 2010-08-09, 22:22
survey: what is the current stable hadoop and hbase combination - HBase - [mail # user]
...:03:19,120 DEBUG  org.apache.hadoop.hbase.regionserver.CompactSplitT hread: Compaction requested for region  HEARTBEAT_MASTERPATCH,,1274304444539/1273 809222 because: regionserver/
   Author: Jinsong Hu, 2010-05-27, 16:25
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