You are viewing a plain text version of this content. The canonical link for it is here.
Posted to commits@hbase.apache.org by ap...@apache.org on 2018/05/23 23:47:17 UTC
[6/7] hbase git commit: HBASE-20597 Use a lock to serialize access to
a shared reference to ZooKeeperWatcher in HBaseReplicationEndpoint
HBASE-20597 Use a lock to serialize access to a shared reference to ZooKeeperWatcher in HBaseReplicationEndpoint
Project: http://git-wip-us.apache.org/repos/asf/hbase/repo
Commit: http://git-wip-us.apache.org/repos/asf/hbase/commit/6ecb4442
Tree: http://git-wip-us.apache.org/repos/asf/hbase/tree/6ecb4442
Diff: http://git-wip-us.apache.org/repos/asf/hbase/diff/6ecb4442
Branch: refs/heads/branch-2.0
Commit: 6ecb4442088bb76bc37a1794376ce0bb08859cb0
Parents: 86a9b80
Author: Andrew Purtell <ap...@apache.org>
Authored: Thu May 17 10:30:28 2018 -0700
Committer: Andrew Purtell <ap...@apache.org>
Committed: Wed May 23 16:46:21 2018 -0700
----------------------------------------------------------------------
.../replication/HBaseReplicationEndpoint.java | 43 ++++++++++++--------
1 file changed, 27 insertions(+), 16 deletions(-)
----------------------------------------------------------------------
http://git-wip-us.apache.org/repos/asf/hbase/blob/6ecb4442/hbase-server/src/main/java/org/apache/hadoop/hbase/replication/HBaseReplicationEndpoint.java
----------------------------------------------------------------------
diff --git a/hbase-server/src/main/java/org/apache/hadoop/hbase/replication/HBaseReplicationEndpoint.java b/hbase-server/src/main/java/org/apache/hadoop/hbase/replication/HBaseReplicationEndpoint.java
index bd5c529..8286f7d 100644
--- a/hbase-server/src/main/java/org/apache/hadoop/hbase/replication/HBaseReplicationEndpoint.java
+++ b/hbase-server/src/main/java/org/apache/hadoop/hbase/replication/HBaseReplicationEndpoint.java
@@ -43,21 +43,22 @@ import org.slf4j.LoggerFactory;
* target cluster is an HBase cluster.
*/
@InterfaceAudience.Private
-@edu.umd.cs.findbugs.annotations.SuppressWarnings(value="MT_CORRECTNESS",
- justification="Thinks zkw needs to be synchronized access but should be fine as is.")
public abstract class HBaseReplicationEndpoint extends BaseReplicationEndpoint
implements Abortable {
private static final Logger LOG = LoggerFactory.getLogger(HBaseReplicationEndpoint.class);
- private ZKWatcher zkw = null; // FindBugs: MT_CORRECTNESS
+ private Object zkwLock = new Object();
+ private ZKWatcher zkw = null;
private List<ServerName> regionServers = new ArrayList<>(0);
private long lastRegionServerUpdate;
protected void disconnect() {
- if (zkw != null) {
- zkw.close();
+ synchronized (zkwLock) {
+ if (zkw != null) {
+ zkw.close();
+ }
}
}
@@ -112,7 +113,9 @@ public abstract class HBaseReplicationEndpoint extends BaseReplicationEndpoint
public synchronized UUID getPeerUUID() {
UUID peerUUID = null;
try {
- peerUUID = ZKClusterId.getUUIDForCluster(zkw);
+ synchronized (zkwLock) {
+ peerUUID = ZKClusterId.getUUIDForCluster(zkw);
+ }
} catch (KeeperException ke) {
reconnect(ke);
}
@@ -124,7 +127,9 @@ public abstract class HBaseReplicationEndpoint extends BaseReplicationEndpoint
* @return zk connection
*/
protected ZKWatcher getZkw() {
- return zkw;
+ synchronized (zkwLock) {
+ return zkw;
+ }
}
/**
@@ -132,10 +137,14 @@ public abstract class HBaseReplicationEndpoint extends BaseReplicationEndpoint
* @throws IOException If anything goes wrong connecting
*/
void reloadZkWatcher() throws IOException {
- if (zkw != null) zkw.close();
- zkw = new ZKWatcher(ctx.getConfiguration(),
+ synchronized (zkwLock) {
+ if (zkw != null) {
+ zkw.close();
+ }
+ zkw = new ZKWatcher(ctx.getConfiguration(),
"connection to cluster: " + ctx.getPeerId(), this);
- getZkw().registerListener(new PeerRegionServerListener(this));
+ zkw.registerListener(new PeerRegionServerListener(this));
+ }
}
@Override
@@ -173,13 +182,15 @@ public abstract class HBaseReplicationEndpoint extends BaseReplicationEndpoint
* for this peer cluster
* @return list of addresses
*/
- // Synchronize peer cluster connection attempts to avoid races and rate
- // limit connections when multiple replication sources try to connect to
- // the peer cluster. If the peer cluster is down we can get out of control
- // over time.
- public synchronized List<ServerName> getRegionServers() {
+ public List<ServerName> getRegionServers() {
try {
- setRegionServers(fetchSlavesAddresses(this.getZkw()));
+ // Synchronize peer cluster connection attempts to avoid races and rate
+ // limit connections when multiple replication sources try to connect to
+ // the peer cluster. If the peer cluster is down we can get out of control
+ // over time.
+ synchronized (zkwLock) {
+ setRegionServers(fetchSlavesAddresses(zkw));
+ }
} catch (KeeperException ke) {
if (LOG.isDebugEnabled()) {
LOG.debug("Fetch slaves addresses failed", ke);