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https://issues.apache.org/jira/browse/HDFS-8897?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Zhuge updated HDFS-8897:
-----------------------------
Status: Patch Available (was: In Progress)
> Balancer should handle fs.defaultFS trailing slash in HA
> --------------------------------------------------------
>
> Key: HDFS-8897
> URL: https://issues.apache.org/jira/browse/HDFS-8897
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: balancer & mover
> Affects Versions: 2.7.1
> Environment: Centos 6.6
> Reporter: LINTE
> Assignee: John Zhuge
> Attachments: HDFS-8897.001.patch, HDFS-8897.002.patch,
> HDFS-8897.003.patch
>
>
> When balancer is launched, it should test if there is already a
> /system/balancer.id file in HDFS.
> When the file doesn't exist, the balancer don't want to run :
> 15/08/14 16:35:12 INFO balancer.Balancer: namenodes = [hdfs://sandbox/,
> hdfs://sandbox]
> 15/08/14 16:35:12 INFO balancer.Balancer: parameters =
> Balancer.Parameters[BalancingPolicy.Node, threshold=10.0, max idle iteration
> = 5, number of nodes to be excluded = 0, number of nodes to be included = 0]
> Time Stamp Iteration# Bytes Already Moved Bytes Left To Move
> Bytes Being Moved
> 15/08/14 16:35:14 INFO balancer.KeyManager: Block token params received from
> NN: update interval=10hrs, 0sec, token lifetime=10hrs, 0sec
> 15/08/14 16:35:14 INFO block.BlockTokenSecretManager: Setting block keys
> 15/08/14 16:35:14 INFO balancer.KeyManager: Update block keys every 2hrs,
> 30mins, 0sec
> 15/08/14 16:35:14 INFO block.BlockTokenSecretManager: Setting block keys
> 15/08/14 16:35:14 INFO balancer.KeyManager: Block token params received from
> NN: update interval=10hrs, 0sec, token lifetime=10hrs, 0sec
> 15/08/14 16:35:14 INFO block.BlockTokenSecretManager: Setting block keys
> 15/08/14 16:35:14 INFO balancer.KeyManager: Update block keys every 2hrs,
> 30mins, 0sec
> java.io.IOException: Another Balancer is running.. Exiting ...
> Aug 14, 2015 4:35:14 PM Balancing took 2.408 seconds
> Looking at the audit log file when trying to run the balancer, the balancer
> create the /system/balancer.id and then delete it on exiting ...
> 2015-08-14 16:37:45,844 INFO FSNamesystem.audit: allowed=true
> ugi=hdfs@SANDBOX.HADOOP (auth:KERBEROS) ip=/x.x.x.x cmd=getfileinfo
> src=/system/balancer.id dst=null perm=null proto=rpc
> 2015-08-14 16:37:45,900 INFO FSNamesystem.audit: allowed=true
> ugi=hdfs@SANDBOX.HADOOP (auth:KERBEROS) ip=/x.x.x.x cmd=create
> src=/system/balancer.id dst=null perm=hdfs:hadoop:rw-r-----
> proto=rpc
> 2015-08-14 16:37:45,919 INFO FSNamesystem.audit: allowed=true
> ugi=hdfs@SANDBOX.HADOOP (auth:KERBEROS) ip=/x.x.x.x cmd=getfileinfo
> src=/system/balancer.id dst=null perm=null proto=rpc
> 2015-08-14 16:37:46,090 INFO FSNamesystem.audit: allowed=true
> ugi=hdfs@SANDBOX.HADOOP (auth:KERBEROS) ip=/x.x.x.x cmd=getfileinfo
> src=/system/balancer.id dst=null perm=null proto=rpc
> 2015-08-14 16:37:46,112 INFO FSNamesystem.audit: allowed=true
> ugi=hdfs@SANDBOX.HADOOP (auth:KERBEROS) ip=/x.x.x.x cmd=getfileinfo
> src=/system/balancer.id dst=null perm=null proto=rpc
> 2015-08-14 16:37:46,117 INFO FSNamesystem.audit: allowed=true
> ugi=hdfs@SANDBOX.HADOOP (auth:KERBEROS) ip=/x.x.x.x cmd=delete
> src=/system/balancer.id dst=null perm=null proto=rpc
> The error seems to be located in
> org/apache/hadoop/hdfs/server/balancer/NameNodeConnector.java
> The function checkAndMarkRunning return null even if the /system/balancer.id
> doesn't exist before entering this function; if it exists, then it is deleted
> and the balancer exit with the same error.
> ----
> private OutputStream checkAndMarkRunning() throws IOException {
> try {
> if (fs.exists(idPath)) {
> // try appending to it so that it will fail fast if another balancer
> is
> // running.
> IOUtils.closeStream(fs.append(idPath));
> fs.delete(idPath, true);
> }
> final FSDataOutputStream fsout = fs.create(idPath, false);
> // mark balancer idPath to be deleted during filesystem closure
> fs.deleteOnExit(idPath);
> if (write2IdFile) {
> fsout.writeBytes(InetAddress.getLocalHost().getHostName());
> fsout.hflush();
> }
> return fsout;
> } catch(RemoteException e) {
>
> if(AlreadyBeingCreatedException.class.getName().equals(e.getClassName())){
> return null;
> } else {
> throw e;
> }
> }
> }
> ----
> Regards
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