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]
Chu Tong commented on HDFS-4492:
--------------------------------
yea, HDFS-4505 is used to fix the real bug behind the balancer problem.
> NameNodeConnector should prevent other balancers to run while the one is running
> --------------------------------------------------------------------------------
>
> Key: HDFS-4492
> URL: https://issues.apache.org/jira/browse/HDFS-4492
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: balancer
> Affects Versions: 2.0.2-alpha
> Reporter: Chu Tong
> Assignee: Chu Tong
> Priority: Blocker
> Attachments: HDFS-4492.patch
>
>
> In hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/balancer/NameNodeConnector.java:
> private OutputStream checkAndMarkRunningBalancer() throws IOException {
> try {
> final DataOutputStream out = fs.create(BALANCER_ID_PATH);
> out.writeBytes(InetAddress.getLocalHost().getHostName());
> out.flush();
> return out;
> } catch(RemoteException e) {
> ...
> In the code, fs.create should set overwrite bit to false so that other balancer can't
run while one is running.
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