com.github.ambry.store

Interface StoreStats

public interface StoreStats

Exposes important stats related to a Store.

Method Summary

Modifier and Type	Method and Description
java.util.Map<StatsReportType,StatsSnapshot>	getStatsSnapshots(java.util.Set<StatsReportType> statsReportTypes, long referenceTimeInMs) Fetches specified types of stats for corresponding Store as a map whose key is StatsReportType and value is StatsSnapshot.
com.github.ambry.utils.Pair<java.lang.Long,java.lang.Long>	getValidSize(TimeRange timeRange) Gets the size of valid data at a particular point in time.

Method Detail

getValidSize

com.github.ambry.utils.Pair<java.lang.Long,java.lang.Long> getValidSize(TimeRange timeRange)
                                                                 throws StoreException

Gets the size of valid data at a particular point in time. The caller specifies a reference time and acceptable resolution for the stats in the form of a TimeRange. The store will return valid data size for a point in time within the specified range. The following data are considered as valid data for this API: 1. PUT with no expiry and no corresponding DELETE 2. PUT expiring at t_exp but t_exp_ref < t_exp 3. PUT with corresponding DELETE at time t_delete but t_del_ref < t_delete 4. DELETE record For this API, t_del_ref is based on the given TimeRange and t_exp_ref is the time when the API is called.

Parameters:

timeRange - the reference TimeRange at which the data is requested. Defines both the reference time and the acceptable resolution

Returns:

a Pair whose first element is the time at which stats was collected (in ms) and whose second element is the valid data size

Throws:

StoreException

getStatsSnapshots

java.util.Map<StatsReportType,StatsSnapshot> getStatsSnapshots(java.util.Set<StatsReportType> statsReportTypes,
                                                               long referenceTimeInMs)
                                                        throws StoreException

Fetches specified types of stats for corresponding Store as a map whose key is StatsReportType and value is StatsSnapshot.

Parameters:

statsReportTypes - the specified StatsReportType to fetch

referenceTimeInMs - the reference time in ms until which deletes and expiration are relevant

Returns:

a map of StatsReportType to StatsSnapshot

Throws:

StoreException