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https://issues.apache.org/jira/browse/HADOOP-18671?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17717490#comment-17717490
]
ASF GitHub Bot commented on HADOOP-18671:
-----------------------------------------
taklwu commented on code in PR #5553:
URL: https://github.com/apache/hadoop/pull/5553#discussion_r1180006650
##########
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/DistributedFileSystem.java:
##########
@@ -1633,6 +1636,53 @@ public DatanodeInfo[] getDataNodeStats(final
DatanodeReportType type)
* @see org.apache.hadoop.hdfs.protocol.ClientProtocol#setSafeMode(
* HdfsConstants.SafeModeAction,boolean)
*/
+ @Override
+ public boolean setSafeMode(SafeModeAction action)
+ throws IOException {
+ return setSafeMode(action, false);
+ }
+
+ /**
+ * Enter, leave or get safe mode.
+ *
+ * @param action
+ * One of SafeModeAction.ENTER, SafeModeAction.LEAVE and
+ * SafeModeAction.GET
+ * @param isChecked
+ * If true check only for Active NNs status, else check first NN's
+ * status
+ */
+ @Override
+ public boolean setSafeMode(SafeModeAction action, boolean isChecked)
+ throws IOException {
+ return dfs.setSafeMode(convertToClientProtocolSafeModeAction(action),
isChecked);
Review Comment:
to confirm your suggestion, should I just the replace `dfs` to `this` like
below?
```suggestion
return this.setSafeMode(convertToClientProtocolSafeModeAction(action),
isChecked);
```
> Add recoverLease(), setSafeMode(), isFileClosed() APIs to FileSystem
> --------------------------------------------------------------------
>
> Key: HADOOP-18671
> URL: https://issues.apache.org/jira/browse/HADOOP-18671
> Project: Hadoop Common
> Issue Type: New Feature
> Components: fs
> Reporter: Wei-Chiu Chuang
> Priority: Major
> Labels: pull-request-available
>
> We are in the midst of enabling HBase and Solr to run on Ozone.
> An obstacle is that HBase relies heavily on HDFS APIs and semantics for its
> Write Ahead Log (WAL) file (similarly, for Solr's transaction log). We
> propose to push up these HDFS APIs, i.e. recoverLease(), setSafeMode(),
> isFileClosed() to FileSystem abstraction so that HBase and other applications
> do not need to take on Ozone dependency at compile time. This work will
> (hopefully) enable HBase to run on other storage system implementations in
> the future.
> There are other HDFS features that HBase uses, including hedged read and
> favored nodes. Those are FS-specific optimizations and are not critical to
> enable HBase on Ozone.
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