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HDFS-2240. Fix a deadlock in LeaseRenewer by enforcing lock acquisition ordering.

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git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1156977 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Tsz-wo Sze 2011-08-12 06:26:35 +00:00
parent 1c2ab728f5
commit d5ef72e8c1
2 changed files with 12 additions and 4 deletions
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3
hdfs/CHANGES.txt
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@ -961,6 +961,9 @@ Trunk (unreleased changes)
HDFS-2186. DN volume failures on startup are not counted. (eli)
HDFS-2240. Fix a deadlock in LeaseRenewer by enforcing lock acquisition
ordering. (szetszwo)
BREAKDOWN OF HDFS-1073 SUBTASKS
HDFS-1521. Persist transaction ID on disk between NN restarts.

13
hdfs/src/java/org/apache/hadoop/hdfs/LeaseRenewer.java
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@ -75,7 +75,9 @@ class LeaseRenewer {
/** Get a {@link LeaseRenewer} instance */
static LeaseRenewer getInstance(final String authority,
final UserGroupInformation ugi, final DFSClient dfsc) throws IOException {
return Factory.INSTANCE.get(authority, ugi, dfsc);
final LeaseRenewer r = Factory.INSTANCE.get(authority, ugi);
r.addClient(dfsc);
return r;
}
/**
@ -132,14 +134,13 @@ public String toString() {
/** Get a renewer. */
private synchronized LeaseRenewer get(final String authority,
final UserGroupInformation ugi, final DFSClient dfsc) {
final UserGroupInformation ugi) {
final Key k = new Key(authority, ugi);
LeaseRenewer r = renewers.get(k);
if (r == null) {
r = new LeaseRenewer(k);
renewers.put(k, r);
}
r.addClient(dfsc);
return r;
}
@ -196,7 +197,7 @@ private synchronized void remove(final LeaseRenewer r) {
private LeaseRenewer(Factory.Key factorykey) {
this.factorykey = factorykey;
setGraceSleepPeriod(LEASE_RENEWER_GRACE_DEFAULT);
unsyncSetGraceSleepPeriod(LEASE_RENEWER_GRACE_DEFAULT);
if (LOG.isTraceEnabled()) {
instantiationTrace = StringUtils.stringifyException(
@ -251,6 +252,10 @@ private synchronized long getSleepPeriod() {
/** Set the grace period and adjust the sleep period accordingly. */
synchronized void setGraceSleepPeriod(final long gracePeriod) {
unsyncSetGraceSleepPeriod(gracePeriod);
}
private void unsyncSetGraceSleepPeriod(final long gracePeriod) {
if (gracePeriod < 100L) {
throw new HadoopIllegalArgumentException(gracePeriod
+ " = gracePeriod < 100ms is too small.");