Hi,
"Application queue PAUSED due to low memory condition" is actually quite
common and usually not a problem, unless you have MANY of them. These are
usually caused either by low memory (because load is too high) or because
hypertable fails to run compactions. We had a bug in 0.9.5.4 which did not
reset some internal flags correctly, thus stopping compactions, and the
cellcaches were not flushed to disk. but this was fixed in 0.9.5.6 (or
0.9.5.5, if i remember correctly).
There are a couple of options you can use to control memory behavior:
--Hypertable.RangeServer.MemoryLimit arg
RangeServer memory limit
--Hypertable.RangeServer.MemoryLimit.Percentage arg (=60)
RangeServer memory limit specified
as
percentage of physical RAM
--Hypertable.RangeServer.LowMemoryLimit.Percentage arg (=10)
Amount of memory to free in low
memory
condition as percentage of
RangeServer
memory limit
--Hypertable.RangeServer.MemoryLimit.EnsureUnused arg
Amount of unused physical memory
--Hypertable.RangeServer.MemoryLimit.EnsureUnused.Percentage arg
Amount of unused physical memory
specified as percentage of physical
RAM
bye
Christoph
2012/6/19 gcc.lua <[email protected]>
> Hi,all
> I have use c++ stream pipe to implement map/reduce logic handle
> big data(hypertable/hadoop)
> I had search the old issues like my problem, it's like CellCache
> memmory fragment,
> and fixed use CellCachePool import in 0.9.1.0/0.9.1.1, It be removed
> in latest version 0.9.5.6(or sth. old version),
> where can I commit the Hypertable.RangeServer.log, thanks
>
> server:(16GB Memory)
>
> 20674 line:
> 1340084923 INFO Hypertable.RangeServer : (/home/hadoop/temp/
> hypertable-0615/src/cc/Hypertable/RangeServe r/
> MaintenanceScheduler.cc:255) Memory Allocation: BlockCache=0.00%
> BlockIndex=0.00% BloomFilter=0.00% CellCache=99.51% ShadowCache=0.00%
> QueryCache=0.49%
>
>
> 221688 line:
> 1340093490 INFO Hypertable.RangeServer : (/home/hadoop/temp/
> hypertable-0615/src/cc/Hypertable/RangeServe r/RangeServer.cc:
> 3710) Application queue PAUSED due to low memory condition
>
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