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HBASE-19772 ReadOnlyZKClient improvements

This commit is contained in:
Duo Zhang 2018-01-11 11:33:36 -08:00 committed by Michael Stack
parent a7f9668c33
commit 70515f5311
1 changed files with 35 additions and 23 deletions
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58
hbase-client/src/main/java/org/apache/hadoop/hbase/zookeeper/ReadOnlyZKClient.java
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@ -31,6 +31,7 @@ import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.util.Threads;
import org.apache.hadoop.hbase.ZooKeeperConnectionException;
import org.apache.yetus.audience.InterfaceAudience;
import org.apache.zookeeper.KeeperException;
@ -116,6 +117,8 @@ public final class ReadOnlyZKClient implements Closeable {
private ZooKeeper zookeeper;
private int pendingRequests = 0;
private String getId() {
return String.format("0x%08x", System.identityHashCode(this));
}
@ -127,12 +130,12 @@ public final class ReadOnlyZKClient implements Closeable {
this.retryIntervalMs =
conf.getInt(RECOVERY_RETRY_INTERVAL_MILLIS, DEFAULT_RECOVERY_RETRY_INTERVAL_MILLIS);
this.keepAliveTimeMs = conf.getInt(KEEPALIVE_MILLIS, DEFAULT_KEEPALIVE_MILLIS);
LOG.info("Start read only zookeeper connection " + getId() + " to " + connectString +
", session timeout " + sessionTimeoutMs + " ms, retries " + maxRetries +
", retry interval " + retryIntervalMs + " ms, keep alive " + keepAliveTimeMs + " ms");
Thread t = new Thread(this::run, "ReadOnlyZKClient");
t.setDaemon(true);
t.start();
LOG.info(
"Start read only zookeeper connection {} to {}, " + "session timeout {} ms, retries {}, " +
"retry interval {} ms, keep alive {} ms",
getId(), connectString, sessionTimeoutMs, maxRetries, retryIntervalMs, keepAliveTimeMs);
Threads.setDaemonThreadRunning(new Thread(this::run),
"ReadOnlyZKClient-" + connectString + "@" + getId());
}
private abstract class ZKTask<T> extends Task {
@ -156,6 +159,7 @@ public final class ReadOnlyZKClient implements Closeable {
@Override
public void exec(ZooKeeper alwaysNull) {
pendingRequests--;
Code code = Code.get(rc);
if (code == Code.OK) {
future.complete(ret);
@ -169,19 +173,19 @@ public final class ReadOnlyZKClient implements Closeable {
future.completeExceptionally(KeeperException.create(code, path));
} else {
if (code == Code.SESSIONEXPIRED) {
LOG.warn(getId() + " session expired, close and reconnect");
LOG.warn("{} to {} session expired, close and reconnect", getId(), connectString);
try {
zk.close();
} catch (InterruptedException e) {
}
}
if (ZKTask.this.delay(retryIntervalMs, maxRetries)) {
LOG.warn(getId() + " failed for " + operationType + " of " + path + ", code = " +
code + ", retries = " + ZKTask.this.retries);
LOG.warn("{} to {} failed for {} of {}, code = {}, retries = {}", getId(),
connectString, operationType, path, code, ZKTask.this.retries);
tasks.add(ZKTask.this);
} else {
LOG.warn(getId() + " failed for " + operationType + " of " + path + ", code = " +
code + ", retries = " + ZKTask.this.retries + ", give up");
LOG.warn("{} to {} failed for {} of {}, code = {}, retries = {}, give up", getId(),
connectString, operationType, path, code, ZKTask.this.retries);
future.completeExceptionally(KeeperException.create(code, path));
}
}
@ -205,6 +209,14 @@ public final class ReadOnlyZKClient implements Closeable {
return true;
}
protected abstract void doExec(ZooKeeper zk);
@Override
public final void exec(ZooKeeper zk) {
pendingRequests++;
doExec(zk);
}
public boolean delay(long intervalMs, int maxRetries) {
if (retries >= maxRetries) {
return false;
@ -217,14 +229,12 @@ public final class ReadOnlyZKClient implements Closeable {
@Override
public void connectFailed(IOException e) {
if (delay(retryIntervalMs, maxRetries)) {
LOG.warn(getId() + " failed to connect to zk for " + operationType + " of " + path +
", retries = " + retries,
e);
LOG.warn("{} to {} failed to connect to zk fo {} of {}, retries = {}", getId(),
connectString, operationType, path, retries, e);
tasks.add(this);
} else {
LOG.warn(getId() + " failed to connect to zk for " + operationType + " of " + path +
", retries = " + retries + ", give up",
e);
LOG.warn("{} to {} failed to connect to zk fo {} of {}, retries = {}, give up", getId(),
connectString, operationType, path, retries, e);
future.completeExceptionally(e);
}
}
@ -249,7 +259,7 @@ public final class ReadOnlyZKClient implements Closeable {
tasks.add(new ZKTask<byte[]>(path, future, "get") {
@Override
public void exec(ZooKeeper zk) {
protected void doExec(ZooKeeper zk) {
zk.getData(path, false,
(rc, path, ctx, data, stat) -> onComplete(zk, rc, data, true), null);
}
@ -265,7 +275,7 @@ public final class ReadOnlyZKClient implements Closeable {
tasks.add(new ZKTask<Stat>(path, future, "exists") {
@Override
public void exec(ZooKeeper zk) {
protected void doExec(ZooKeeper zk) {
zk.exists(path, false, (rc, path, ctx, stat) -> onComplete(zk, rc, stat, false), null);
}
});
@ -311,9 +321,11 @@ public final class ReadOnlyZKClient implements Closeable {
if (task == CLOSE) {
break;
}
if (task == null) {
LOG.info(getId() + " no activities for " + keepAliveTimeMs +
" ms, close active connection. Will reconnect next time when there are new requests.");
if (task == null && pendingRequests == 0) {
LOG.info(
"{} to {} no activities for {} ms, close active connection. " +
"Will reconnect next time when there are new requests",
getId(), connectString, keepAliveTimeMs);
closeZk();
continue;
}
@ -339,7 +351,7 @@ public final class ReadOnlyZKClient implements Closeable {
@Override
public void close() {
if (closed.compareAndSet(false, true)) {
LOG.info("Close zookeeper connection " + getId() + " to " + connectString);
LOG.info("Close zookeeper connection {} to {}", getId(), connectString);
tasks.add(CLOSE);
}
}