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From Anthony F <>
Subject Re: Bulk ingest losing tablet server
Date Wed, 15 Jan 2014 13:19:05 GMT
Just checked on the native mem maps . . . looks like it is set to 1GB.  Do
the index and data caches reside in native mem maps if available or is
native mem used for something else?

I just repeated an ingest . . . this time I did not lose any tablet servers
but my logs are filling up with the following messages:

2014-01-15 08:16:41,643 [constraints.MetadataConstraints] DEBUG: violating
metadata mutation : b;74~thf
2014-01-15 08:16:41,643 [constraints.MetadataConstraints] DEBUG:  update:
file:/b-00012bq/I00012cj.rf value 20272720,0,1389757684543
2014-01-15 08:16:41,643 [constraints.MetadataConstraints] DEBUG:  update:
loaded:/b-00012bq/I00012cj.rf value 2675766456963732003
2014-01-15 08:16:41,643 [constraints.MetadataConstraints] DEBUG:  update:
srv:time value M1389757684543
2014-01-15 08:16:41,643 [constraints.MetadataConstraints] DEBUG:  update:
srv:lock value tservers/$2438da698db13b4

On Mon, Jan 13, 2014 at 2:44 PM, Sean Busbey <>wrote:

> On Mon, Jan 13, 2014 at 12:02 PM, Anthony F <> wrote:
>> Yes, system swappiness is set to 0.  I'll run again and gather more logs.
>> Is there a zookeeper timeout setting that I can adjust to avoid this
>> issue and is that advisable?  Basically, the tservers are colocated with
>> HDFS datanodes and Hadoop nodemanagers.  The machines are overallocated in
>> terms of RAM.  So, I have a feeling that when a map-reduce job is kicked
>> off, it causes the tserver to page out to swap space.  Once the map-reduce
>> job finishes and the bulk ingest is kicked off, the tserver is paged back
>> in and the ZK timeout causes a shutdown.
> You should not overallocate the amount of memory on the machines.
> Generally, you should provide memory limits under teh assumption that
> everything will be on at once.
> Many parts of Hadoop (not just Accumulo) will degrade or malfunction in
> the presence of memory swapping.
> How much of hte 12GB for Accumulo is for native memmaps?

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