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https://issues.apache.org/jira/browse/HDFS-14084?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16732268#comment-16732268
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Pranay Singh commented on HDFS-14084:
-------------------------------------
[~elgoiri] thanks for commenting on the issue, I looked at the details of the
failure related to
TestSSLFactory. It is caused due to testServerWeakCiphers, which is a sporadic
failure and has been reported in HADOOP-16016.
-------------------------
[ERROR] testServerWeakCiphers(org.apache.hadoop.security.ssl.TestSSLFactory)
Time elapsed: 0.082 s <<< FAILURE! java.lang.AssertionError: Expected to find
'no cipher suites in common' but got unexpected exception:
javax.net.ssl.SSLHandshakeException: No appropriate protocol (protocol is
disabled or cipher suites are inappropriate)
---------------------------
The other two failures are caused because "port is in use"
*java.net.BindException: Port in use: localhost:36969 at*
org.apache.hadoop.http.HttpServer2.constructBindException(HttpServer2.java:1207)
at org.apache.hadoop.http.HttpServer2.bindForSinglePort(HttpServer2.java:1229)
at org.apache.hadoop.http.HttpServer2.openListeners(HttpServer2.java:1288) at
org.apache.hadoop.http.HttpServer2.start(HttpServer2.java:1143) at
org.apache.hadoop.hdfs.server.namenode.NameNodeHttpServer.start(NameNodeHttpServer.java:183)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.startHttpServer(NameNode.java:892)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:703)
at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:960) at
org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:933) at
org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1699)
at
org.apache.hadoop.hdfs.MiniDFSCluster.restartNameNode(MiniDFSCluster.java:2188)
at
org.apache.hadoop.hdfs.MiniDFSCluster.restartNameNodes(MiniDFSCluster.java:2143)
at
org.apache.hadoop.hdfs.server.namenode.TestFSEditLogLoader.testHasNonEcBlockUsingStripedIDForAddBlock(TestFSEditLogLoader.java:656)
*java.net.BindException: Port in use: localhost:10197 at*
org.apache.hadoop.http.HttpServer2.constructBindException(HttpServer2.java:1207)
at org.apache.hadoop.http.HttpServer2.bindForSinglePort(HttpServer2.java:1229)
at org.apache.hadoop.http.HttpServer2.openListeners(HttpServer2.java:1288) at
org.apache.hadoop.http.HttpServer2.start(HttpServer2.java:1143) at
org.apache.hadoop.hdfs.server.namenode.NameNodeHttpServer.start(NameNodeHttpServer.java:183)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.startHttpServer(NameNode.java:892)
at
org.apache.hadoop.hdfs.server.namenode.NameNode.initialize(NameNode.java:703)
at org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:960) at
org.apache.hadoop.hdfs.server.namenode.NameNode.<init>(NameNode.java:933) at
org.apache.hadoop.hdfs.server.namenode.NameNode.createNameNode(NameNode.java:1699)
at
org.apache.hadoop.hdfs.MiniDFSCluster.createNameNode(MiniDFSCluster.java:1316)
at
org.apache.hadoop.hdfs.MiniDFSCluster.configureNameService(MiniDFSCluster.java:1085)
> Need for more stats in DFSClient
> --------------------------------
>
> Key: HDFS-14084
> URL: https://issues.apache.org/jira/browse/HDFS-14084
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 3.0.0
> Reporter: Pranay Singh
> Assignee: Pranay Singh
> Priority: Minor
> Attachments: HDFS-14084.001.patch, HDFS-14084.002.patch,
> HDFS-14084.003.patch, HDFS-14084.004.patch, HDFS-14084.005.patch,
> HDFS-14084.006.patch, HDFS-14084.007.patch, HDFS-14084.008.patch,
> HDFS-14084.009.patch, HDFS-14084.010.patch, HDFS-14084.011.patch
>
>
> The usage of HDFS has changed from being used as a map-reduce filesystem, now
> it's becoming more of like a general purpose filesystem. In most of the cases
> there are issues with the Namenode so we have metrics to know the workload or
> stress on Namenode.
> However, there is a need to have more statistics collected for different
> operations/RPCs in DFSClient to know which RPC operations are taking longer
> time or to know what is the frequency of the operation.These statistics can
> be exposed to the users of DFS Client and they can periodically log or do
> some sort of flow control if the response is slow. This will also help to
> isolate HDFS issue in a mixed environment where on a node say we have Spark,
> HBase and Impala running together. We can check the throughput of different
> operation across client and isolate the problem caused because of noisy
> neighbor or network congestion or shared JVM.
> We have dealt with several problems from the field for which there is no
> conclusive evidence as to what caused the problem. If we had metrics or stats
> in DFSClient we would be better equipped to solve such complex problems.
> List of jiras for reference:
> -------------------------
> HADOOP-15538 HADOOP-15530 ( client side deadlock)
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