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[expand - 1 more] - Re: Compaction problem - HBase - [mail # user]
... happening in the same site: 1. WAL writing 2. Flush 3. Compaction  So, if you can write to HDFS at 73 MB/sec, you will get ~ 25 MB/sec. I didn't get that - I guess HBase process it self add some...
   Author: Asaf Mesika, 2013-03-27, 19:55
Re: Getting the scan type at preCompact - HBase - [mail # user]
...But my scanner is a wrapper to the scanner passed on to me in preCompact. This scanner is created in the Store object (StoreScanner) with arguments I don't have at preCompact...
...ScannerOpen(). So I can't create it. I want the vanilla scanner hbase uses is preCompact so I can wrap it with my behavior but also I need to know whether its minor or major. Currently I hacked my region...
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   Author: Asaf Mesika, 2013-01-29, 18:21
Re: increment counters via bulk upload in HBase - HBase - [mail # user]
...We solved this partially by converting increment to put and aggregating in preCompact. I guess that if you bulk upload an HFile which has this puts which are a representation of a delta...
... to a column, and merge it in the compaction it could work.  On Monday, February 18, 2013, Andrew Purtell wrote:  ...
   Author: Asaf Mesika, 2013-02-18, 22:18
Re: RegionServer stuck in internalObtainRowLock forever - HBase 0.94.7 - HBase - [mail # user]
....apache.hadoop.hbase.regionserver.KeyValueHeap.next(KeyValueHeap.java:95) at org.apache.hadoop.hbase.regionserver.StoreScanner.next(StoreScanner.java:383) at org.apache.hadoop.hbase.regionserver.StoreScanner.next(StoreScanner.java:311) at org.apache.hadoop.hbase.regionserver.Compactor.compact...
...(Compactor.java:184) at org.apache.hadoop.hbase.regionserver.Store.compact(Store.java:1081) at org.apache.hadoop.hbase.regionserver.HRegion.compact(HRegion.java:1335) at org.apache.hadoop.hbase.regionserver.compactions.CompactionRequest.run(Compaction...
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   Author: Asaf Mesika, 2014-02-17, 10:00
[expand - 1 more] - Re: Uneven write request to regions - HBase - [mail # user]
.... So our compaction queue start filling up with those store files needs to be compacted. At the of the road, the RS gets dead.  Our secondary issue is those of empty regions - we get...
   Author: Asaf Mesika, 2013-11-16, 19:16
Re: Scan + Gets are disk bound - HBase - [mail # user]
...:02, you want to remove the value associated with 13:02.  The best way to do this is  to write a simple RegionObserver Coprocessor, which hooks to the compaction process (preCompact for instance...
... of an existing process which reads the values either way, so you are not paying the price of reading it again your MR job. Also, in between major compactions, you can also implement the preScan hook...
   Author: Asaf Mesika, 2013-06-05, 05:51
Re: Using HBase for Deduping - HBase - [mail # user]
... for you during major compaction.    On Thursday, February 14, 2013, Rahul Ravindran wrote:  ...
   Author: Asaf Mesika, 2013-02-14, 22:26
Re: Row Key Design in time based aplication - HBase - [mail # user]
... beyond 12G, and combined with compactions happening concurrently with queries, it creates a memory competition. Is there a any way to control this in Pheonix? Is it scalable in terms...
   Author: Asaf Mesika, 2013-02-21, 22:49
Missing metrics in any context inheriting from AbstractMetricsContext - HBase - [mail # user]
....class=org.apache.hadoop.hbase.metrics.file.TimeStampingFileContext hbase.fileName=/tmp/metrics_hbase.log hbase.period=10  # HBase-specific configuration to reset long-running stats (e.g. compactions) # If this variable is left out, then the default...
   Author: Asaf Mesika, 2013-06-05, 18:31
Re: Enabling compression - HBase - [mail # user]
... a major compaction of the table which  will rewrite all the cells and so compact them?   Yeah, although you may not want to recompact everything all at once in  a live system. You can just let...
... it happen naturally through cycles of  flushes and compactions, it's all fine.   J-D ...
   Author: Asaf Mesika, 2012-07-25, 04:42
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