incubator-accumulo-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Billie J Rinaldi <>
Subject Re: hypertable routs hbase
Date Thu, 09 Feb 2012 19:16:02 GMT
On Thursday, February 9, 2012 1:37:25 PM, "David Medinets" <>:
> The test was run on a total of sixteen machines connected together
> with gigabit Ethernet.. HBase failed to handle 41 and 167 billion
> record inserts, overwhelmed by garbage collection
> I haven't used Accumulo enough to know if the same garbage collection
> issue would arise with it.

It's unfortunate that they've tested the brand-new version of Hypertable against a 6-month-old
version of HBase.
Accumulo deals with Java garbage collection issues by not storing the in-memory maps in Java
managed memory, instead using a C++ STL map of maps.  This will be used as long as the native
map library is built and available on the system; if it isn't available, Accumulo falls back
to using Java managed memory.  So it is important when configuring a new instance to make
sure to sort out the native map library.


View raw message