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Intern DataSegments in SQLMetadataSegmentManager (#3267) 

* Helps with heap pressure on coordinator
This commit is contained in:
Charles Allen 2016-07-21 16:46:08 -07:00 committed by Fangjin Yang
parent a42ccb6d19
commit c58bbfa0c6
1 changed files with 9 additions and 4 deletions
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13
server/src/main/java/io/druid/metadata/SQLMetadataSegmentManager.java
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@ -25,6 +25,8 @@ import com.google.common.base.Supplier;
import com.google.common.base.Throwables;
import com.google.common.collect.Collections2;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Interner;
import com.google.common.collect.Interners;
import com.google.common.collect.Lists;
import com.google.common.collect.Ordering;
import com.google.common.util.concurrent.ListenableFuture;
@ -59,7 +61,6 @@ import org.skife.jdbi.v2.tweak.ResultSetMapper;
import org.skife.jdbi.v2.util.ByteArrayMapper;
import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
@ -76,6 +77,7 @@ import java.util.concurrent.atomic.AtomicReference;
@ManageLifecycle
public class SQLMetadataSegmentManager implements MetadataSegmentManager
{
private static final Interner<DataSegment> DATA_SEGMENT_INTERNER = Interners.newWeakInterner();
private static final EmittingLogger log = new EmittingLogger(SQLMetadataSegmentManager.class);
@ -194,10 +196,10 @@ public class SQLMetadataSegmentManager implements MetadataSegmentManager
) throws SQLException
{
try {
DataSegment segment = jsonMapper.readValue(
final DataSegment segment = DATA_SEGMENT_INTERNER.intern(jsonMapper.readValue(
payload,
DataSegment.class
);
));
timeline.add(
segment.getInterval(),
@ -464,7 +466,10 @@ public class SQLMetadataSegmentManager implements MetadataSegmentManager
throws SQLException
{
try {
return jsonMapper.readValue(r.getBytes("payload"), DataSegment.class);
return DATA_SEGMENT_INTERNER.intern(jsonMapper.readValue(
r.getBytes("payload"),
DataSegment.class
));
}
catch (IOException e) {
log.makeAlert(e, "Failed to read segment from db.");