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HBASE-14361 ReplicationSink should create Connection instances lazily

This commit is contained in:
stack 2015-09-15 05:15:47 -07:00
parent 72b4c906b8
commit d147f8f8f4
1 changed files with 23 additions and 4 deletions
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27
hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSink.java
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@ -72,9 +72,12 @@ public class ReplicationSink {
private static final Log LOG = LogFactory.getLog(ReplicationSink.class);
private final Configuration conf;
private final Connection sharedHtableCon;
// Volatile because of note in here -- look for double-checked locking:
// http://www.oracle.com/technetwork/articles/javase/bloch-effective-08-qa-140880.html
private volatile Connection sharedHtableCon;
private final MetricsSink metrics;
private final AtomicLong totalReplicatedEdits = new AtomicLong();
private final Object sharedHtableConLock = new Object();
/**
* Create a sink for replication
@ -88,7 +91,6 @@ public class ReplicationSink {
this.conf = HBaseConfiguration.create(conf);
decorateConf();
this.metrics = new MetricsSink();
this.sharedHtableCon = ConnectionFactory.createConnection(this.conf);
}
/**
@ -213,7 +215,14 @@ public class ReplicationSink {
*/
public void stopReplicationSinkServices() {
try {
this.sharedHtableCon.close();
if (this.sharedHtableCon != null) {
synchronized (sharedHtableConLock) {
if (this.sharedHtableCon != null) {
this.sharedHtableCon.close();
this.sharedHtableCon = null;
}
}
}
} catch (IOException e) {
LOG.warn("IOException while closing the connection", e); // ignoring as we are closing.
}
@ -232,7 +241,17 @@ public class ReplicationSink {
}
Table table = null;
try {
table = this.sharedHtableCon.getTable(tableName);
// See https://en.wikipedia.org/wiki/Double-checked_locking
Connection connection = this.sharedHtableCon;
if (connection == null) {
synchronized (sharedHtableConLock) {
connection = this.sharedHtableCon;
if (connection == null) {
connection = this.sharedHtableCon = ConnectionFactory.createConnection(this.conf);
}
}
}
table = connection.getTable(tableName);
for (List<Row> rows : allRows) {
table.batch(rows, null);
}