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storage_service: Fix getToppartitions to always return both reads and writes 

In line with the previous API, the getToppartitions function returned
results for one specified sampler (reads OR writes). This forced
the user to call the function once for each sampler, which is
suboptimal.
This commit changes the signature so that results for both samplers
are returned and the user can then pick whichever they need.
This commit is contained in:
Piotr Wojtczak 2021-05-10 11:53:34 +02:00 committed by Avi Kivity
parent 440313eb72
commit a7c4c39dd0
2 changed files with 30 additions and 14 deletions
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42
src/main/java/org/apache/cassandra/service/StorageService.java
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@ -28,6 +28,7 @@ import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
@ -93,6 +94,8 @@ public class StorageService extends MetricsMBean implements StorageServiceMBean,
private static final CompositeType COUNTER_COMPOSITE_TYPE;
private static final TabularType COUNTER_TYPE;
private static final String[] OPERATION_NAMES = new String[]{"read", "write"};
private static final String[] SAMPLER_NAMES = new String[]{"cardinality", "partitions"};
private static final String[] SAMPLER_DESCS = new String[]
{ "cardinality of partitions",
@ -1799,6 +1802,11 @@ public class StorageService extends MetricsMBean implements StorageServiceMBean,
@Override
public CompositeData getToppartitions(String sampler, List<String> keyspaceFilters, List<String> tableFilters, int duration, int capacity, int count) throws OpenDataException {
return getToppartitions(Arrays.asList(sampler), keyspaceFilters, tableFilters, duration, capacity, count).get(sampler.toLowerCase());
}
@Override
public Map<String, CompositeData> getToppartitions(List<String> samplers, List<String> keyspaceFilters, List<String> tableFilters, int duration, int capacity, int count) throws OpenDataException {
MultivaluedMap<String, String> queryParams = new MultivaluedHashMap<String, String>();
APIClient.set_query_param(queryParams, "duration", Integer.toString(duration));
APIClient.set_query_param(queryParams, "capacity", Integer.toString(capacity));
@ -1806,23 +1814,29 @@ public class StorageService extends MetricsMBean implements StorageServiceMBean,
APIClient.set_query_param(queryParams, "table_filters", tableFilters != null ? APIClient.join(tableFilters.toArray(new String[0])) : null);
JsonObject result = client.getJsonObj("/storage_service/toppartitions", queryParams);
JsonArray counters = result.getJsonArray((sampler.equalsIgnoreCase("reads")) ? "read" : "write");
long cardinality = result.getJsonNumber((sampler.equalsIgnoreCase("reads")) ? "read_cardinality" : "write_cardinality").longValue();
long size = 0;
TabularDataSupport tabularResult = new TabularDataSupport(COUNTER_TYPE);
Map<String, CompositeData> resultsMap = new HashMap<>();
if (counters != null) {
size = (count > counters.size()) ? counters.size() : count;
for (int i = 0; i < size; i++) {
JsonObject counter = counters.getJsonObject(i);
tabularResult.put(new CompositeDataSupport(COUNTER_COMPOSITE_TYPE, COUNTER_NAMES,
new Object[] { counter.getString("partition"), // raw
counter.getJsonNumber("count").longValue(), // count
counter.getJsonNumber("error").longValue(), // error
counter.getString("partition") })); // string
for (String operation : OPERATION_NAMES) {
JsonArray counters = result.getJsonArray(operation);
long cardinality = result.getJsonNumber(operation + "_cardinality").longValue();
long size = 0;
TabularDataSupport tabularResult = new TabularDataSupport(COUNTER_TYPE);
if (counters != null) {
size = (count > counters.size()) ? counters.size() : count;
for (int i = 0; i < size; i++) {
JsonObject counter = counters.getJsonObject(i);
tabularResult.put(new CompositeDataSupport(COUNTER_COMPOSITE_TYPE, COUNTER_NAMES,
new Object[] { counter.getString("partition"), // raw
counter.getJsonNumber("count").longValue(), // count
counter.getJsonNumber("error").longValue(), // error
counter.getString("partition") })); // string
}
}
resultsMap.put(operation + "s", new CompositeDataSupport(SAMPLING_RESULT, SAMPLER_NAMES, new Object[] { cardinality, tabularResult }));
}
return new CompositeDataSupport(SAMPLING_RESULT, SAMPLER_NAMES, new Object[] { cardinality, tabularResult });
return resultsMap;
}
}

2
src/main/java/org/apache/cassandra/service/StorageServiceMBean.java
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@ -890,4 +890,6 @@ public interface StorageServiceMBean extends NotificationEmitter {
public long getUptime();
public CompositeData getToppartitions(String sampler, List<String> keyspaceFilters, List<String> tableFilters, int duration, int capacity, int count) throws OpenDataException;
public Map<String, CompositeData> getToppartitions(List<String> samplers, List<String> keyspaceFilters, List<String> tableFilters, int duration, int capacity, int count) throws OpenDataException;
}