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HDFS-3616. Fix a ConcurrentModificationException bug that BP actor threads may not be shutdown properly in DataNode. Contributed by Jing Zhao 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1402608 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Tsz-wo Sze 2012-10-26 18:22:49 +00:00
parent 0e796b61e8
commit 3335e50244
3 changed files with 19 additions and 10 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -504,6 +504,9 @@ Release 2.0.3-alpha - Unreleased
out stream returned by WebHdfsFileSystem does not support it. (Jing Zhao out stream returned by WebHdfsFileSystem does not support it. (Jing Zhao
via szetszwo) via szetszwo)
HDFS-3616. Fix a ConcurrentModificationException bug that BP actor threads
may not be shutdown properly in DataNode. (Jing Zhao via szetszwo)
Release 2.0.2-alpha - 2012-09-07 Release 2.0.2-alpha - 2012-09-07
INCOMPATIBLE CHANGES INCOMPATIBLE CHANGES

18
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BlockPoolManager.java
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@ -106,15 +106,15 @@ class BlockPoolManager {
} }
} }
void shutDownAll() throws InterruptedException { void shutDownAll(BPOfferService[] bposArray) throws InterruptedException {
BPOfferService[] bposArray = this.getAllNamenodeThreads(); if (bposArray != null) {
for (BPOfferService bpos : bposArray) {
for (BPOfferService bpos : bposArray) { bpos.stop(); //interrupts the threads
bpos.stop(); //interrupts the threads }
} //now join
//now join for (BPOfferService bpos : bposArray) {
for (BPOfferService bpos : bposArray) { bpos.join();
bpos.join(); }
} }
} }

8
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/DataNode.java
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@ -1095,6 +1095,12 @@ public class DataNode extends Configured
} }
} }
// We need to make a copy of the original blockPoolManager#offerServices to
// make sure blockPoolManager#shutDownAll() can still access all the
// BPOfferServices, since after setting DataNode#shouldRun to false the
// offerServices may be modified.
BPOfferService[] bposArray = this.blockPoolManager == null ? null
: this.blockPoolManager.getAllNamenodeThreads();
this.shouldRun = false; this.shouldRun = false;
shutdownPeriodicScanners(); shutdownPeriodicScanners();
@ -1141,7 +1147,7 @@ public class DataNode extends Configured
if(blockPoolManager != null) { if(blockPoolManager != null) {
try { try {
this.blockPoolManager.shutDownAll(); this.blockPoolManager.shutDownAll(bposArray);
} catch (InterruptedException ie) { } catch (InterruptedException ie) {
LOG.warn("Received exception in BlockPoolManager#shutDownAll: ", ie); LOG.warn("Received exception in BlockPoolManager#shutDownAll: ", ie);
} }