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Re: data loss after cluster wide power loss - HBase - [mail # user]
...HBase is interesting here, because it rewrites old data into new files. So a power outage by default would not just lose new data but potentially old data as well. You can enable "sync on bl...
   Author: Lars Hofhansl, 2013-07-01, 22:47
Re: Poor HBase random read performance - HBase - [mail # dev]
...Cool. That mingles well with the theory. If each read of a KV incurs a bock read reducing the block size by 4 should lead to close to a 4x gain.  W.r.t. the more store files... More KVs...
   Author: Lars Hofhansl, 2013-06-30, 07:45
[HBASE-5930] Limits the amount of time an edit can live in the memstore. - HBase - [issue]
...A colleague of mine ran into an interesting issue.He inserted some data with the WAL disabled, which happened to fit in the aggregate Memstores memory.Two weeks later he a had problem with t...
http://issues.apache.org/jira/browse/HBASE-5930    Author: Lars Hofhansl, 2013-06-03, 16:50
[HBASE-8525] Use sleep multilier when choosing sinks in ReplicationSource - HBase - [issue]
...Currently we see this every second. Filling up the log:2013-05-10 18:36:00,766 INFO org.apache.zookeeper.ClientCnxn: Opening socket connection to server ist6-mnds1-2-sfm.ops.sfdc.net/10.224....
http://issues.apache.org/jira/browse/HBASE-8525    Author: Lars Hofhansl, 2013-05-23, 06:51
[HBASE-6523] HConnectionImplementation still does not recover from all ZK issues. - HBase - [issue]
...During some testing here at Salesforce.com we found another scenario where an HConnectionImplementation would never recover from a lost ZK connection....
http://issues.apache.org/jira/browse/HBASE-6523    Author: Lars Hofhansl, 2013-05-16, 08:39
[HBASE-6428] Pluggable Compaction policies - HBase - [issue]
...For some usecases is useful to allow more control over how KVs get compacted.For example one could envision storing old versions of a KV separate HFiles, which then rarely have to be touched...
http://issues.apache.org/jira/browse/HBASE-6428    Author: Lars Hofhansl, 2013-05-14, 01:20
[HBASE-6755] HRegion.internalObtainRowLock uses unecessary AtomicInteger - HBase - [issue]
...I was looking at HBase's implementation of locks and saw that is unnecessarily uses an AtomicInteger to obtain a unique lockid.The observation is that we only need a unique one and don't car...
http://issues.apache.org/jira/browse/HBASE-6755    Author: Lars Hofhansl, 2013-05-07, 19:46
[HBASE-5746] HFileDataBlockEncoderImpl uses wrong header size when reading HFiles with no checksums (0.96) - HBase - [issue]
http://issues.apache.org/jira/browse/HBASE-5746    Author: Lars Hofhansl, 2013-05-07, 15:54
[HBASE-5622] Improve efficiency of mapred vesion of RowCounter - HBase - [issue]
http://issues.apache.org/jira/browse/HBASE-5622    Author: Lars Hofhansl, 2013-05-02, 04:49
[HBASE-6116] Allow parallel HDFS writes for HLogs. - HBase - [issue]
...In HDFS-1783 I adapted Dhrubas changes to be used in Hadoop trunk.This issue will include the necessary reflection changes to optionally enable this for the WALs in HBase....
http://issues.apache.org/jira/browse/HBASE-6116    Author: Lars Hofhansl, 2013-05-01, 06:47
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