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https://issues.apache.org/jira/browse/HBASE-3800?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13021912#comment-13021912
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gaojinchao commented on HBASE-3800:
-----------------------------------
why delete this code? can you tell me your case ?
+
+ // Are there any data nodes up yet?
+ // Currently the safe mode check falls through if the namenode is up but no
+ // datanodes have reported in yet.
+ try {
+ while (dfs.getDataNodeStats().length == 0) {
+ LOG.info("Waiting for dfs to come up...");
+ try {
+ Thread.sleep(wait);
+ } catch (InterruptedException e) {
+ //continue
+ }
+ }
+ } catch (IOException e) {
+
+ // getDataNodeStats can fail if superuser privilege is required to run
+ // the datanode report, just ignore it
+ }
+
// Make sure dfs is not in safe mode
while (dfs.setSafeMode(FSConstants.SafeModeAction.SAFEMODE_GET)) {
LOG.info("Waiting for dfs to exit safe mode...");
> If HMaster is started after NN without starting DN in Hbase 090.2 then
> HMaster is not able to start due to AlreadyCreatedException for
> /hbase/hbase.version
> -----------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-3800
> URL: https://issues.apache.org/jira/browse/HBASE-3800
> Project: HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 0.90.2
> Reporter: gaojinchao
> Assignee: Andrew Purtell
> Fix For: 0.90.3, 0.92.0
>
> Attachments: HBASE-3800-0.90.patch, HBASE-3800-trunk.patch
>
>
> It reproduces when HMaster is started for the first time and NN is started
> without starting DN
> Hmaster logs:
> 2011-04-19 16:49:09,208 DEBUG
> org.apache.hadoop.hbase.master.ActiveMasterManager: A master is now available
> 2011-04-19 16:49:09,400 WARN org.apache.hadoop.hbase.util.FSUtils: Version
> file was empty, odd, will try to set it.
> 2011-04-19 16:51:09,674 WARN org.apache.hadoop.hdfs.DFSClient: DataStreamer
> Exception: org.apache.hadoop.ipc.RemoteException: java.io.IOException: File
> /hbase/hbase.version could only be replicated to 0 nodes, instead of 1
> ...........
> 2011-04-19 16:51:09,674 WARN org.apache.hadoop.hdfs.DFSClient: Error Recovery
> for block null bad datanode[0] nodes == null
> 2011-04-19 16:51:09,674 WARN org.apache.hadoop.hdfs.DFSClient: Could not get
> block locations. Source file "/hbase/hbase.version" - Aborting...
> 2011-04-19 16:51:09,674 WARN org.apache.hadoop.hbase.util.FSUtils: Unable to
> create version file at hdfs://C4C1:9000/hbase, retrying:
> org.apache.hadoop.ipc.RemoteException: java.io.IOException: File
> /hbase/hbase.version could only be replicated to 0 nodes, instead of 1
> ...........
> 2011-04-19 16:56:19,695 WARN org.apache.hadoop.hbase.util.FSUtils: Unable to
> create version file at hdfs://C4C1:9000/hbase, retrying:
> org.apache.hadoop.ipc.RemoteException:
> org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException: failed to
> create file /hbase/hbase.version for
> DFSClient_hb_m_C4C1.site:60000_1303202948768 on client 157.5.100.1 because
> current leaseholder is trying to recreate file.
> org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException: failed to
> create file /hbase/hbase.version for
> DFSClient_hb_m_C4C1.site:60000_1303202948768 on client 157.5.100.1 because
> current leaseholder is trying to recreate file.
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.startFileInternal(FSNamesystem.java:1068)
> ....
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