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From "Kurt Greaves (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-12173) Materialized View may turn on TRACING
Date Thu, 20 Jul 2017 03:44:00 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-12173?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kurt Greaves updated CASSANDRA-12173:
-------------------------------------
    Priority: Minor  (was: Major)

> Materialized View may turn on TRACING
> -------------------------------------
>
>                 Key: CASSANDRA-12173
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12173
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Materialized Views
>            Reporter: Hiroshi Usami
>            Priority: Minor
>
> We observed this in our test cluster(C*3.0.6), but TRAING was OFF apparently.
> After creating Materialized View, the Write count jumped up to 20K from 5K, and the ViewWrite
rose up to 10K.
> This is supposed to be done by MV, but some nodes which had 14,000+ SSTables in the system_traces
directory went down in a half day, because of running out of file descriptors.
> {code}
> Counting by: find /var/lib/cassandra/data/system_traces/ -name "*-Data.db"|wc -l
> 	node01: 0
> 	node02: 3
> 	node03: 1
> 	node04: 0
> 	node05: 0
> 	node06: 0
> 	node07: 2
> 	node08: 0
> 	node09: 0
> 	node10: 0
> 	node11: 2
> 	node12: 2
> 	node13: 1
> 	node14: 7
> 	node15: 1
> 	node16: 5
> 	node17: 0
> 	node18: 0
> 	node19: 0
> 	node20: 0
> 	node21: 1
> 	node22: 0
> 	node23: 2
> 	node24: 14420
> 	node25: 0
> 	node26: 2
> 	node27: 0
> 	node28: 1
> 	node29: 1
> 	node30: 2
> 	node31: 1
> 	node32: 0
> 	node33: 0
> 	node34: 0
> 	node35: 14371
> 	node36: 0
> 	node37: 1
> 	node38: 0
> 	node39: 0
> 	node40: 1
> {code}
> In node24, the sstabledump of the oldest SSTable in system_traces/events directory starts
with:
> {code}
> [
>   {
>     "partition" : {
>       "key" : [ "e07851d0-4421-11e6-abd7-59d7f275ba79" ],
>       "position" : 0
>     },
>     "rows" : [
>       {
>         "type" : "row",
>         "position" : 30,
>         "clustering" : [ "e07878e0-4421-11e6-abd7-59d7f275ba79" ],
>         "liveness_info" : { "tstamp" : "2016-07-07T09:04:57.197Z", "ttl" : 86400, "expires_at"
: "2016-07-08T09:04:57Z", "expired" : true },
>         "cells" : [
>           { "name" : "activity", "value" : "Parsing CREATE MATERIALIZED VIEW
> ...
> {code}
> So this could be the begining of TRACING ON implicitly. In node35, the oldest one also
starts with the "Parsing CREATE MATERIALIZED VIEW".



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