accumulo-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Christopher <>
Subject Re: default for increased from 50M to 1M in 1.7
Date Thu, 07 Jul 2016 15:50:39 GMT
The change was introduced in, and it's an entirely
new property. The old property was a per-session property. The new one is
per-tserver, and is a better strategy, because it reduces the risk of
multiple writers exhausting exhausting tserver memory, while still giving
the user control over how frequently flushes/sync's occur.

On Thu, Jul 7, 2016 at 10:32 AM Jeff Kubina <> wrote:

> I noticed that the default value for in
> 1.7 is 50M but in 1.6 it is 1M (tserver.mutation.queue.max). Is this
> increase to compensate for the performance hit of moving the WALs to the
> HDFS or some other factor?
> Is there a way to compute the number of times the buffer is flushed to
> calculate how this effects performance?
> --
> Jeff Kubina

View raw message