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https://issues.apache.org/jira/browse/CASSANDRA-14668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16598377#comment-16598377
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Stefan Podkowinski commented on CASSANDRA-14668:
------------------------------------------------
Example events from a single read repair as retrieved via JMX.
ReadRepairEvent:
{noformat}
class=org.apache.cassandra.service.reads.repair.ReadRepairEvent,
type=START_REPAIR,
command=SELECT * FROM ks.table1 WHERE key = a LIMIT 100,
consistency=ALL,
speculativeRetry=PERCENTILE,
keyspace=ks,
table=table1,
allEndpoints=[127.0.0.1:7000, 127.0.0.2:7000],
endpointDestinations=[127.0.0.1:7000, 127.0.0.2:7000],
thread=Native-Transport-Requests-1,
digestsByEndpoint={
127.0.0.2:7000={digestHex=d41d8cd98f00b204e9800998ecf8427e,
isDigestResponse=true},
127.0.0.1:7000={digestHex=82577faad6f8c6450786e68df35db686,
isDigestResponse=false}
},
ts=1535700434509
{noformat}
PartitionRepairEvent:
{noformat}
class=org.apache.cassandra.service.reads.repair.PartitionRepairEvent,
type=SEND_INITIAL_REPAIRS,
consistency=ALL,
keyspace=ks,
mutation=Mutation(keyspace='ks', key='61', modifications=[
[ks.table1] key=a partition_deletion=deletedAt=-9223372036854775808,
localDeletion=2147483647 columns=[[] | [c1 v1]]
Row[info=[ts=1535700208937182] ]: EMPTY | [c1=1 ts=1535700208937182], [v1=1
ts=1535700208937182]
]),
destination=127.0.0.2:7000,
thread=Native-Transport-Requests-1,
key=61,
token=-8839064797231613815,
ts=1535700434522
{noformat}
> Diag events for read repairs
> ----------------------------
>
> Key: CASSANDRA-14668
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14668
> Project: Cassandra
> Issue Type: Improvement
> Components: Observability
> Reporter: Stefan Podkowinski
> Assignee: Stefan Podkowinski
> Priority: Major
> Fix For: 4.x
>
>
> Read repairs have been a highly discussed topic during the last months and
> also saw some significant code changes. I'd like to be better prepared in
> case we need to investigate any further RR issues in the future, by adding
> diagnostic events that can be enabled for exposing informations such as:
> * contacted endpoints
> * digest responses by endpoint
> * affected partition keys
> * speculated reads / writes
>
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