leventov commented on a change in pull request #6402: Thread-safe QueryMetrics
URL: https://github.com/apache/incubator-druid/pull/6402#discussion_r223765023
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File path:
processing/src/main/java/org/apache/druid/query/DefaultQueryMetrics.java
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@@ -23,51 +23,64 @@
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.collect.ImmutableMap;
import org.apache.druid.collections.bitmap.BitmapFactory;
+import org.apache.druid.java.util.common.ISE;
import org.apache.druid.java.util.common.StringUtils;
import org.apache.druid.java.util.emitter.service.ServiceEmitter;
import org.apache.druid.java.util.emitter.service.ServiceMetricEvent;
import org.apache.druid.query.filter.Filter;
import org.joda.time.Interval;
+import javax.annotation.concurrent.GuardedBy;
+import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;
-/**
- * DefaultQueryMetrics is unsafe for use from multiple threads. It fails with
RuntimeException on access not from the
- * thread where it was constructed. To "transfer" DefaultQueryMetrics from one
thread to another {@link #ownerThread}
- * field should be updated.
- */
public class DefaultQueryMetrics<QueryType extends Query<?>> implements
QueryMetrics<QueryType>
{
protected final ObjectMapper jsonMapper;
- protected final ServiceMetricEvent.Builder builder = new
ServiceMetricEvent.Builder();
- protected final Map<String, Number> metrics = new HashMap<>();
+ protected final Object lock = new Object();
+ @GuardedBy("lock") private final Map<String, String> singleValueDims = new
HashMap<>();
+ @GuardedBy("lock") private final Map<String, String[]> multiValueDims = new
HashMap<>();
+ @GuardedBy("lock") private final Map<String, Number> metrics = new
HashMap<>();
+ @GuardedBy("lock") private Thread ownerThread;
Review comment:
Should remain `protected` for subclasses
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