accumulo-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Hai Pham <>
Subject Re: How to control Minor Compaction by programming
Date Fri, 31 Jul 2015 03:24:38 GMT
Hey William, Josh and David, 

Thanks for explaining, I might not have been clear: I used the web interface with port 50095
to monitor the real-time charts (ingest, scan, load average, minor compaction, major compaction,

Nonetheless, as I witnessed, when I ingested about 100k entries -> then minor compaction
happened -> ingest was stuck -> the level of minor compaction on the charts was just
about 1.0, 2.0 and max 3.0 while about >20k entries were forced out of memory (I knew this
by looking at the number of entries in memory w.r.t the table being ingested to) -> then
when minor compaction ended, ingest resumed, somewhat faster. 

Thus I presume the level 1.0, 2.0, 3.0 is not representative for number of files being minor-compacted
from memory? 

From: Josh Elser <>
Sent: Thursday, July 30, 2015 7:12 PM
Subject: Re: How to control Minor Compaction by programming

> Also, can you please explain the number 0, 1.0, 2.0, ... in charts (web
> monitoring) denoting the level of Minor Compaction and Major Compaction?

On the monitor, the number of compactions are of the form:

active (queued)

e.g. 4 (2), would mean that 4 are running and 2 are queued.

> Thank you!
> Hai Pham

View raw message