jojochuang commented on code in PR #4107:
URL: https://github.com/apache/hadoop/pull/4107#discussion_r859381403
##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java:
##########
@@ -4914,6 +4914,33 @@ int getNumberOfDatanodes(DatanodeReportType type) {
}
}
+ DatanodeInfo[] slowDataNodesReport() throws IOException {
+ String operationName = "slowDataNodesReport";
+ DatanodeInfo[] datanodeInfos;
+ checkSuperuserPrivilege(operationName);
Review Comment:
does it need to require super user privilege?
##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSAdmin.java:
##########
@@ -433,7 +433,7 @@ static int run(DistributedFileSystem dfs, String[] argv,
int idx) throws IOExcep
*/
private static final String commonUsageSummary =
"\t[-report [-live] [-dead] [-decommissioning] " +
- "[-enteringmaintenance] [-inmaintenance]]\n" +
+ "[-enteringmaintenance] [-inmaintenance] [-slownodes]]\n" +
Review Comment:
The corresponding documentation needs to update when CLI commands are
added/updated.
##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSAdmin.java:
##########
@@ -632,6 +638,20 @@ private static void
printDataNodeReports(DistributedFileSystem dfs,
}
}
+ private static void printSlowDataNodeReports(DistributedFileSystem dfs,
boolean listNodes,
Review Comment:
Can you provide a sample output? It would be confusing, I guess. I suspect
you would need some kind of header to distinguish from the other data node
reports.
##########
hadoop-hdfs-project/hadoop-hdfs-client/src/main/java/org/apache/hadoop/hdfs/protocol/ClientProtocol.java:
##########
@@ -1868,4 +1868,16 @@ BatchedEntries<OpenFileEntry> listOpenFiles(long prevId,
*/
@AtMostOnce
void satisfyStoragePolicy(String path) throws IOException;
+
+ /**
+ * Get report on all of the slow Datanodes. Slow running datanodes are
identified based on
+ * the Outlier detection algorithm, if slow peer tracking is enabled for the
DFS cluster.
+ *
+ * @return Datanode report for slow running datanodes.
+ * @throws IOException If an I/O error occurs.
+ */
+ @Idempotent
+ @ReadOnly
+ DatanodeInfo[] getSlowDatanodeReport() throws IOException;
Review Comment:
I just want to check with every one that it is okay to have an array of
objects as the return value.
I think it's fine but just want to check with every one, because once we
decide the the interface it can't be changed later.
##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/DFSAdmin.java:
##########
@@ -433,7 +433,7 @@ static int run(DistributedFileSystem dfs, String[] argv,
int idx) throws IOExcep
*/
private static final String commonUsageSummary =
"\t[-report [-live] [-dead] [-decommissioning] " +
- "[-enteringmaintenance] [-inmaintenance]]\n" +
+ "[-enteringmaintenance] [-inmaintenance] [-slownodes]]\n" +
Review Comment:
In fact it would appear confusion to HDFS administrators. These subcommands
are meant to filter the DNs in these states, and "slownodes" is not a defined
DataNode state.
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