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HDFS-4106. BPServiceActor#lastHeartbeat, lastBlockReport and lastDeletedReport should be volatile. Contributed by Jing Zhao. 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1403075 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Suresh Srinivas 2012-10-28 19:03:57 +00:00
parent abe3676e50
commit fd7de4c4eb
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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@ -241,6 +241,9 @@ Trunk (Unreleased)
HDFS-4115. TestHDFSCLI.testAll fails one test due to number format.
(Trevor Robinson via suresh)
HDFS-4106. BPServiceActor#lastHeartbeat, lastBlockReport and
lastDeletedReport should be volatile. (Jing Zhao via suresh)
BREAKDOWN OF HDFS-3077 SUBTASKS
HDFS-3077. Quorum-based protocol for reading and writing edit logs.

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;
/**