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HDFS-4106. Merging change r1403075 from trunk. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1409039 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Suresh Srinivas 2012-11-14 00:03:15 +00:00
parent 6a743f3f5b
commit 09774b8005
2 changed files with 10 additions and 3 deletions
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3
hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt
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@ -229,6 +229,9 @@ Release 2.0.3-alpha - Unreleased
HDFS-3921. NN will prematurely consider blocks missing when entering active
state while still in safe mode. (atm)
HDFS-4106. BPServiceActor#lastHeartbeat, lastBlockReport and
lastDeletedReport should be volatile. (Jing Zhao via suresh)
Release 2.0.2-alpha - 2012-09-07
INCOMPATIBLE CHANGES

10
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/datanode/BPServiceActor.java
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@ -75,14 +75,18 @@ class BPServiceActor implements Runnable {
BPOfferService bpos;
long lastBlockReport = 0;
long lastDeletedReport = 0;
// lastBlockReport, lastDeletedReport and lastHeartbeat may be assigned/read
// by testing threads (through BPServiceActor#triggerXXX), while also
// assigned/read by the actor thread. Thus they should be declared as volatile
// to make sure the "happens-before" consistency.
volatile long lastBlockReport = 0;
volatile long lastDeletedReport = 0;
boolean resetBlockReportTime = true;
Thread bpThread;
DatanodeProtocolClientSideTranslatorPB bpNamenode;
private long lastHeartbeat = 0;
private volatile long lastHeartbeat = 0;
private volatile boolean initialized = false;
/**