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From Josh Elser <josh.el...@gmail.com>
Subject Re: Lost tablet server lock..SESSION_EXPIRED
Date Fri, 14 Oct 2016 15:39:15 GMT
Jeff Kubina wrote:
> If you are doing a lot of ingesting via batch writes (which the Upsess
> implies), you might consider increasing tserver.walog.max.size to 2G
> instead of 1G (but doing so will cause the loss of more data if a
> tserver dies).

There is only dataloss if you lose each datanode which is hosting the 
blocks of that WAL. Losing a TabletServer does *not* imply data loss.

In the common case, increasing the size of the WAL will just increase 
the amount of time it takes to perform recovery of the WAL after a 
TabletServer dies.

> The troubleshooting
> <https://github.com/apache/accumulo/blob/master/docs/src/main/asciidoc/chapters/troubleshooting.txt>
> documentation with accumulo is helpful in finding latency issues too.
>

- Josh

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