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SQLMetadataSegmentManager: Comments, formatting adjustments (#7452)

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Follow up to #7447.
This commit is contained in:
Gian Merlino 2019-04-11 21:57:50 -07:00 committed by Fangjin Yang
parent 2470b3279f
commit 3854cfd15e
2 changed files with 5 additions and 3 deletions
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server/src/main/java/org/apache/druid/metadata/SQLMetadataSegmentManager.java
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@ -105,7 +105,9 @@ public class SQLMetadataSegmentManager implements MetadataSegmentManager
private final SQLMetadataConnector connector; private final SQLMetadataConnector connector;
// Volatile since this reference is reassigned in "poll" and then read from in other threads. // Volatile since this reference is reassigned in "poll" and then read from in other threads.
// Starts null so we can differentiate "never polled" (null) from "polled, but empty" (empty map) // Starts null so we can differentiate "never polled" (null) from "polled, but empty" (empty map).
// Note that this is not simply a lazy-initialized variable: it starts off as null, and may transition between
// null and nonnull multiple times as stop() and start() are called.
@Nullable @Nullable
private volatile ConcurrentHashMap<String, DruidDataSource> dataSources = null; private volatile ConcurrentHashMap<String, DruidDataSource> dataSources = null;