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RE: retrieving HRegion's in AssignmentManager - HBase - [mail # dev]
...You can't do a HashMap with a  byte[] as the Key, unfortunately.  You'll have to use a TreeMap (where you can specify a comparator), use a wr apping class, or you could even make i...
   Author: Jonathan Gray, 2011-03-15, 03:14
[expand - 3 more] - RE: what's the roadmap of secondary index of hbase? - HBase - [mail # dev]
...Right.  Rather than another table, you use another column family in the pri mary table a la Megastore and Lily.  ...
   Author: Jonathan Gray, 2011-03-01, 19:38
RE: "Error recovery for block... failed because recovery from primary datanode failed 6 times" - HBase - [mail # user]
...The DFS errors are after the server aborts.  What is in the log before the  server abort?  Doesn't seem to show any reason here which is unusual.  Anything in the master?...
   Author: Jonathan Gray, 2011-02-14, 07:08
RE: Parent/child relation - go vertical, horizontal, or many tables? - HBase - [mail # user]
...Just to chime in with my usual take on this (seems like the tall vs. wide d iscussion happens every few weeks...)  For "get all children of a parent", doing a get() on the wide table vs...
   Author: Jonathan Gray, 2011-02-11, 20:48
RE: CHANGES.txt in trunk vs branch? - HBase - [mail # dev]
...I like the approach Todd outlines, but have been doing it as Stack describe s.  +1 on moving to Todd/Hadoop approach.  In addition, for JIRA, we should pro bably put the fix versio...
   Author: Jonathan Gray, 2011-02-07, 20:56
[expand - 1 more] - RE: Master node Question - HBase - [mail # user]
...Unfortunately, this is not the case for the HDFS NameNode.  HDFS does not s upport out-of-the-box backup master nodes.  There are a few different techn iques people use for NameNod...
   Author: Jonathan Gray, 2011-02-07, 19:42
[expand - 1 more] - RE: How long can I have a table open? - HBase - [mail # user]
...What's the nature of the stability problems?  These are issues seen server- side or just client-side?  Restarting your long-running clients fixes the issues?  nd th , ave a &n...
   Author: Jonathan Gray, 2011-02-07, 19:36
RE: Amazon EC2 - HBase - [mail # user]
...There are others who have had far more experience than I have with HBase +  EC2, so will let them chime in.  But I personally recommend against this di rection if you expect to hav...
   Author: Jonathan Gray, 2011-02-07, 19:35
RE: Fastest way to read only the keys of a HTable? - HBase - [mail # user]
...If you only need to consider a single column family, use Scan.addFamily() o n your scanner.  Then there will be no impact of the other column families.  e...
   Author: Jonathan Gray, 2011-02-03, 20:15
RE: Region Servers Crashing during Random Reads - HBase - [mail # user]
...How much heap are you running on your RegionServers?  6GB of total RAM is on the low end.  For high throughput applications, I wo uld recommend at least 6-8GB of heap (so 8+ GB of ...
   Author: Jonathan Gray, 2011-02-03, 20:13
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB