About balay80

balay80 · ‎11-15-2018

I got same error, as below Caused by: GSSException: No valid credentials provided (Mechanism level: Fail to create credential. (63) - No service creds) at sun.security.jgss.krb5.Krb5Context.initSecContext(Krb5Context.java:770) at sun.security.jgss.GSSContextImpl.initSecContext(GSSContextImpl.java:248) at sun.security.jgss.GSSContextImpl.initSecContext(GSSContextImpl.java:179) at com.sun.security.sasl.gsskerb.GssKrb5Client.evaluateChallenge(GssKrb5Client.java:192) ... 41 more Caused by: KrbException: Fail to create credential. (63) - No service creds at sun.security.krb5.internal.CredentialsUtil.acquireServiceCreds(CredentialsUtil.java:162) at sun.security.krb5.Credentials.acquireServiceCreds(Credentials.java:458) at sun.security.jgss.krb5.Krb5Context.initSecContext(Krb5Context.java:693) And i am able to resolve it by deleting existing krbtgt prinicipals and recreating krbtgt cross realm prinicipals on both clusters with same password. the password must be same for these prinicipals on both KDC's. krbtgt/A.COM@B.COM krbtgt/B.COM@A.COM

balay80 · ‎10-07-2016

Internal users are mostly for the applications (hadoop ecosystem components e.g hive,storm,hdfs,kafka,hbase etc). and external users are those which you will sync with AD are Ldap, these are the users for which you will set different policies.

balay80 · ‎09-28-2016

this is resolved. after checking /var/log/ambari-metrics-collector/hbase-ams-master-XXXX.log found Caused by: javax.security.auth.login.LoginException: Unable to obtain password from user. checked keytabs files under /etc/security/keytabs/ams-hbase.master.keytab after klist to this keytab came to know that its has invalid entry for hosts. klist -ekt ams-hbase.master.keytab Keytab name: FILE:ams-hbase.master.keytab KVNO Timestamp Principal ---- ----------------- -------------------------------------------------------- 2 07/04/16 03:09:57 host/kdchost1.EXAMPLE.COM@EXAMPLE.COM (aes256-cts-hmac-sha1-96) 2 07/04/16 03:09:57 host/kdchost1.EXAMPLE.COM@EXAMPLE.COM (aes128-cts-hmac-sha1-96) 2 07/04/16 03:09:57 host/kdchost1.EXAMPLE.COM@EXAMPLE.COM (des3-cbc-sha1) 2 07/04/16 03:09:57 host/kdchost1.EXAMPLE.COM@EXAMPLE.COM (arcfour-hmac) 2 07/04/16 03:09:57 host/kdchost1.EXAMPLE.COM@EXAMPLE.COM (aes256-cts-hmac-sha1-96) 2 07/04/16 03:09:57 host/kdchost1.EXAMPLE.COM@EXAMPLE.COM (aes128-cts-hmac-sha1-96) 2 07/04/16 03:09:57 host/kdchost1.EXAMPLE.COM@EXAMPLE.COM (des3-cbc-sha1) 2 07/04/16 03:09:57 host/kdchost1.EXAMPLE.COM@EXAMPLE.COM (arcfour-hmac) 2 07/13/16 11:11:54 kmsusr@EXAMPLE.COM (aes256-cts-hmac-sha1-96) 2 07/13/16 11:11:54 kmsusr@EXAMPLE.COM (aes128-cts-hmac-sha1-96) 2 07/13/16 11:11:54 kmsusr@EXAMPLE.COM (des3-cbc-sha1) 2 07/13/16 11:11:54 kmsusr@EXAMPLE.COM (arcfour-hmac) 3 07/13/16 11:14:14 kmsusr@EXAMPLE.COM (aes256-cts-hmac-sha1-96) 3 07/13/16 11:14:14 kmsusr@EXAMPLE.COM (aes128-cts-hmac-sha1-96) 3 07/13/16 11:14:14 kmsusr@EXAMPLE.COM (des3-cbc-sha1) 3 07/13/16 11:14:14 kmsusr@EXAMPLE.COM (arcfour-hmac) 4 07/13/16 11:15:46 kmsusr@EXAMPLE.COM (aes256-cts-hmac-sha1-96) 4 07/13/16 11:15:46 kmsusr@EXAMPLE.COM (aes128-cts-hmac-sha1-96) 4 07/13/16 11:15:46 kmsusr@EXAMPLE.COM (des3-cbc-sha1) 4 07/13/16 11:15:46 kmsusr@EXAMPLE.COM (arcfour-hmac) 2 09/21/16 11:11:23 amshbase/edgenode.EXAMPLE.COM@EXAMPLE.COM (aes256-cts-hmac-sha1-96) 2 09/21/16 11:11:23 amshbase/edgenode.EXAMPLE.COM@EXAMPLE.COM (aes128-cts-hmac-sha1-96) 2 09/21/16 11:11:23 amshbase/edgenode.EXAMPLE.COM@EXAMPLE.COM (des3-cbc-sha1) 2 09/21/16 11:11:23 amshbase/edgenode.EXAMPLE.COM@EXAMPLE.COM (arcfour-hmac) 3 09/21/16 11:13:40 amshbase/edgenode.EXAMPLE.COM@EXAMPLE.COM (aes256-cts-hmac-sha1-96) 3 09/21/16 11:13:40 amshbase/edgenode.EXAMPLE.COM@EXAMPLE.COM (aes128-cts-hmac-sha1-96) 3 09/21/16 11:13:40 amshbase/edgenode.EXAMPLE.COM@EXAMPLE.COM (des3-cbc-sha1) 3 09/21/16 11:13:40 amshbase/edgenode.EXAMPLE.COM@EXAMPLE.COM (arcfour-hmac) 4 09/21/16 11:15:07 amshbase/edgenode.EXAMPLE.COM@EXAMPLE.COM (aes256-cts-hmac-sha1-96) 4 09/21/16 11:15:07 amshbase/edgenode.EXAMPLE.COM@EXAMPLE.COM (aes128-cts-hmac-sha1-96) 4 09/21/16 11:15:07 amshbase/edgenode.EXAMPLE.COM@EXAMPLE.COM (des3-cbc-sha1) 4 09/21/16 11:15:07 amshbase/edgenode.EXAMPLE.COM@EXAMPLE.COM (arcfour-hmac) so deleted that keytab file and generated new keytab with valid entries and placed on the metrics-collector host under /etc/security/keytabs restarted metrics-collector service the service started.

balay80 · ‎09-28-2016

Recently we had moved ambari-server to other host. cluster is kerberized. metrics collector service dies after sometime with below error in ambari-metrics-collector.log ERROR [main] master.HMasterCommandLine: Master exiting java.lang.RuntimeException: Failed construction of Master: class org.apache.hadoop.hbase.master.HMaster

balay80 · ‎09-20-2016

@ pfctic2 pfctic2 can you go to /etc/yum.repos.d/ and list the configured repositories. if possible cat the repository file and paste here

balay80 · ‎09-20-2016

@ Tristan Fily can you share hue.ini configuration here.

balay80 · ‎09-20-2016

@Roland Simonis most of the people follow same process which @Gerd Koenig has suggested, its best way as of now. Else you can go ahead and have a new server keep the host_name and ip_address same as older one and install the master components on it.

balay80 · ‎09-20-2016

I got this error in Starting AMBARI-METRICES from Ambari WEB-UI after upgrading. Traceback (most recent call last): File "/var/lib/ambari-agent/cache/common-services/AMBARI_METRICS/0.1.0/package/scripts/metrics_collector.py", line 131, in <module> AmsCollector().execute() File "/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py", line 219, in execute method(env) File "/var/lib/ambari-agent/cache/common-services/AMBARI_METRICS/0.1.0/package/scripts/metrics_collector.py", line 44, in start self.configure(env, action = 'start') # for security File "/var/lib/ambari-agent/cache/common-services/AMBARI_METRICS/0.1.0/package/scripts/metrics_collector.py", line 41, in configure ams(name='collector') File "/usr/lib/python2.6/site-packages/ambari_commons/os_family_impl.py", line 89, in thunk return fn(*args, **kwargs) File "/var/lib/ambari-agent/cache/common-services/AMBARI_METRICS/0.1.0/package/scripts/ams.py", line 202, in ams group=params.user_group File "/usr/lib/python2.6/site-packages/resource_management/core/base.py", line 154, in __init__ self.env.run() File "/usr/lib/python2.6/site-packages/resource_management/core/environment.py", line 152, in run self.run_action(resource, action) File "/usr/lib/python2.6/site-packages/resource_management/core/environment.py", line 118, in run_action provider_action() File "/usr/lib/python2.6/site-packages/resource_management/libraries/providers/xml_config.py", line 67, in action_create encoding = self.resource.encoding File "/usr/lib/python2.6/site-packages/resource_management/core/base.py", line 154, in __init__ self.env.run() File "/usr/lib/python2.6/site-packages/resource_management/core/environment.py", line 152, in run self.run_action(resource, action) File "/usr/lib/python2.6/site-packages/resource_management/core/environment.py", line 118, in run_action provider_action() File "/usr/lib/python2.6/site-packages/resource_management/core/providers/system.py", line 90, in action_create content = self._get_content() File "/usr/lib/python2.6/site-packages/resource_management/core/providers/system.py", line 127, in _get_content return content() File "/usr/lib/python2.6/site-packages/resource_management/core/source.py", line 51, in __call__ return self.get_content() File "/usr/lib/python2.6/site-packages/resource_management/core/source.py", line 142, in get_content rendered = self.template.render(self.context) File "/usr/lib/python2.6/site-packages/ambari_jinja2/environment.py", line 891, in render return self.environment.handle_exception(exc_info, True) File "<template>", line 5, in top-level template code UnicodeEncodeError: 'ascii' codec can't encode character u'\u2028' in position 108: ordinal not in range(128)

balay80 · ‎09-20-2016

@ Nitin ROOT CAUSE:- There should be a table named by namespace for maintaining the info of tables, which is already exists on /hbase directory , While starting the process HMaster it will create the namespace directory under /hbase directory So it is showing the Table Exists Exception. SOLUTION:- We have to manually repair the /hbase metastore by using offline command as, $HBASE_HOME/bin/hbase org.apache.hadoop.hbase.util.hbck.OfflineMetaRepair Then start the process of HMASTER. IF this is not working Use the zookeeper client for removing it as, From the Hbase docker or any one of the docker. zookeeper-3.4.6/bin/zkCli.sh -server 192.168.1.90 ls / rmr /hbase ls / exit zookeeper-3.4.6/bin/zkCli.sh -server 192.168.1.91 ls / exit

balay80 · ‎09-16-2016

Add below properties in core-site.xml using Ambari if you are not using ambari then edit core-site.xml with below values. <property> <name>hadoop.proxyuser.oozie.hosts</name> <value>*</value> </property> <property> <name>hadoop.proxyuser.oozie.groups</name> <value>*</value> </property> <property> <name>hadoop.proxyuser.falcon.hosts</name> <value>*</value> </property> <property> <name>hadoop.proxyuser.falcon.groups</name> <value>*</value> </property> Please accept this if it answers your question

balay80 · ‎09-16-2016

as in your logs it looks like following file does not exist on hdfs hdfs://cassandraProd/var/opt/hosting/hadoop/hive/scratchdir/pns/248c8712-4eb6-4926-98cf-fdacc54e3425/hive_2016-09-15_16-00-56_218_8691044763703447835-2/-mr-10002/1b934a7e-fdb2-4279-b104-f3970de433a4/map.xml#map.xml to check if file exist or not do #hadoop fs -ls /cassandraProd/var/opt/hosting/hadoop/hive/scratchdir/pns/248c8712-4eb6-4926-98cf-fdacc54e3425/hive_2016-09-15_16-00-56_218_8691044763703447835-2/-mr-10002/1b934a7e-fdb2-4279-b104-f3970de433a4/

balay80 · ‎09-16-2016

Hi Vijay Kumar J If your hdfs is HA enabled then you need to do below config changes in hue.ini fs_defaultfs=<hdfs nameservice> httpfs is needed to support a centralized WebHDFS interface to an HA enable NN Cluster for that follow below link https://community.hortonworks.com/articles/804/httpfs-configure-and-run-with-hdp-224x.html and in hue.ini put webhdfs_url=http://<your httpfs host>:14000/webhdfs/v1/ and in resourcemanager_host=<your resource manger host> Please accept this answer if it answers your question.

balay80 · ‎09-16-2016

Goto hive service config in ambari and search hive.heapsize and edit hiveserver2 heap size PFA screenshot

balay80 · ‎09-16-2016

@J. D. Bacolod i would suggest you should with 2. because with option 2 you will have 1.more control to the operations , 2.there will be less mistakes (negligible) , 3. you and will be away from mis-configuration headaches. 4.Daily operations and configurations will be quick and simple. Please find below documentation from hortonworks for automated installation of HDP using ambari. please go through all the steps carefully. https://docs.hortonworks.com/HDPDocuments/Ambari-2.2.2.0/bk_Installing_HDP_AMB/content/index.html if you want to go to the part where you want to install multiple nodes then goto step 3. Installing, Configuring, and Deploying a HDP Cluster if this answers your query please accept the answer

balay80 · ‎09-16-2016

@Suneet patil : can you let me know how you installed hue. is it 1. yum install hue OR 2. from tarballs. if it is 1. then goto node where you have installed hue and run #locate hue.ini or locate file /etc/hue/conf.empty/hue.ini and do the necessary changes. if it is 2 then. you will find hue.ini in at /usr/local/hue/desktop/conf/hue.ini If this resolve your issue please accept the answer.

balay80 · ‎09-15-2016

As in error log you provide you can see ERROR Error: That port is already in use. it means that 8000 port is already in use. locate hue.ini file and change the http port something else (port which is currently not in use) # Webserver listens on this address and port #http_host=0.0.0.0 http_host=//127.0.0.1 http_port=8000

balay80 · ‎09-15-2016

You need to increase hive.heapsize for hive

balay80 · ‎09-15-2016

You are using redhat 7 which is registered with RHN. but it dont have the packages required for ambari server you need to configure ambari repository to install ambari server. Follow below documentation to configure repository and install ambari server. https://docs.hortonworks.com/HDPDocuments/Ambari-2.2.1.0/bk_Installing_HDP_AMB/content/_download_the_ambari_repo_lnx7.html

balay80 · ‎09-15-2016

Your cluster is kerberized and this issue looks like kerberos ticket issue. you dont have a valid kerberos ticket. to run this command first get a valid ticket for your user to run this commad. To get a valid ticket type #kinit then it will ask for kerberos password. after you enter password #klist it will display kerberos ticket for your user. now try running command to connect to hive.

balay80 · ‎07-27-2016

ntpd is already running and all the nodes are in sync, still facing this issue

balay80 · ‎07-27-2016

2016-07-27 03:49:38,874 ERROR [pool-5-thread-20]: transport.TSaslTransport (TSaslTransport.java:open(315)) - SASL negotiation failure javax.security.sasl.SaslException: GSS initiate failed [Caused by GSSException: Failure unspecified at GSS-API level (Mechanism level: Clock skew too great (37))] at com.sun.security.sasl.gsskerb.GssKrb5Server.evaluateResponse(GssKrb5Server.java:177) at org.apache.thrift.transport.TSaslTransport$SaslParticipant.evaluateChallengeOrResponse(TSaslTransport.java:539) at org.apache.thrift.transport.TSaslTransport.open(TSaslTransport.java:283) at org.apache.thrift.transport.TSaslServerTransport.open(TSaslServerTransport.java:41) at org.apache.thrift.transport.TSaslServerTransport$Factory.getTransport(TSaslServerTransport.java:216) at org.apache.hadoop.hive.thrift.HadoopThriftAuthBridge$Server$TUGIAssumingTransportFactory$1.run(HadoopThriftAuthBridge.java:739) at org.apache.hadoop.hive.thrift.HadoopThriftAuthBridge$Server$TUGIAssumingTransportFactory$1.run(HadoopThriftAuthBridge.java:736) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:356) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1637) at org.apache.hadoop.hive.thrift.HadoopThriftAuthBridge$Server$TUGIAssumingTransportFactory.getTransport(HadoopThriftAuthBridge.java:736) at org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:268) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Caused by: GSSException: Failure unspecified at GSS-API level (Mechanism level: Clock skew too great (37)) at sun.security.jgss.krb5.Krb5Context.acceptSecContext(Krb5Context.java:788) at sun.security.jgss.GSSContextImpl.acceptSecContext(GSSContextImpl.java:342) at sun.security.jgss.GSSContextImpl.acceptSecContext(GSSContextImpl.java:285) at com.sun.security.sasl.gsskerb.GssKrb5Server.evaluateResponse(GssKrb5Server.java:155) ... 14 more Caused by: KrbException: Clock skew too great (37) at sun.security.krb5.KrbApReq.authenticate(KrbApReq.java:301) at sun.security.krb5.KrbApReq.<init>(KrbApReq.java:144) at sun.security.jgss.krb5.InitSecContextToken.<init>(InitSecContextToken.java:108) at sun.security.jgss.krb5.Krb5Context.acceptSecContext(Krb5Context.java:771) ... 17 more 2016-07-27 03:50:11,109 ERROR [pool-5-thread-15]: server.TThreadPoolServer (TThreadPoolServer.java:run(296)) - Error occurred during processing of message. java.lang.RuntimeException: org.apache.thrift.transport.TTransportException: GSS initiate failed at org.apache.thrift.transport.TSaslServerTransport$Factory.getTransport(TSaslServerTransport.java:219) at org.apache.hadoop.hive.thrift.HadoopThriftAuthBridge$Server$TUGIAssumingTransportFactory$1.run(HadoopThriftAuthBridge.java:739) at org.apache.hadoop.hive.thrift.HadoopThriftAuthBridge$Server$TUGIAssumingTransportFactory$1.run(HadoopThriftAuthBridge.java:736) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:356) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1637) at org.apache.hadoop.hive.thrift.HadoopThriftAuthBridge$Server$TUGIAssumingTransportFactory.getTransport(HadoopThriftAuthBridge.java:736) at org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:268) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Caused by: org.apache.thrift.transport.TTransportException: GSS initiate failed at org.apache.thrift.transport.TSaslTransport.sendAndThrowMessage(TSaslTransport.java:232) at org.apache.thrift.transport.TSaslTransport.open(TSaslTransport.java:316) at org.apache.thrift.transport.TSaslServerTransport.open(TSaslServerTransport.java:41) at org.apache.thrift.transport.TSaslServerTransport$Factory.getTransport(TSaslServerTransport.java:216) ... 10 more 2016-07-27 03:50:11,109 ERROR [pool-5-thread-20]: server.TThreadPoolServer (TThreadPoolServer.java:run(296)) - Error occurred during processing of message. java.lang.RuntimeException: org.apache.thrift.transport.TTransportException: GSS initiate failed at org.apache.thrift.transport.TSaslServerTransport$Factory.getTransport(TSaslServerTransport.java:219) at org.apache.hadoop.hive.thrift.HadoopThriftAuthBridge$Server$TUGIAssumingTransportFactory$1.run(HadoopThriftAuthBridge.java:739) at org.apache.hadoop.hive.thrift.HadoopThriftAuthBridge$Server$TUGIAssumingTransportFactory$1.run(HadoopThriftAuthBridge.java:736) at java.security.AccessController.doPrivileged(Native Method) at javax.security.auth.Subject.doAs(Subject.java:356) at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1637) at org.apache.hadoop.hive.thrift.HadoopThriftAuthBridge$Server$TUGIAssumingTransportFactory.getTransport(HadoopThriftAuthBridge.java:736) at org.apache.thrift.server.TThreadPoolServer$WorkerProcess.run(TThreadPoolServer.java:268) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Caused by: org.apache.thrift.transport.TTransportException: GSS initiate failed at org.apache.thrift.transport.TSaslTransport.sendAndThrowMessage(TSaslTransport.java:232) at org.apache.thrift.transport.TSaslTransport.open(TSaslTransport.java:316) at org.apache.thrift.transport.TSaslServerTransport.open(TSaslServerTransport.java:41) at org.apache.thrift.transport.TSaslServerTransport$Factory.getTransport(TSaslServerTransport.java:216) ... 10 more

balay80 · ‎06-15-2016

@rajdip chaudhuri : is hive server2 is HA enabled and you are trying to connect it using zookeeper through beeline ?

balay80 · ‎06-15-2016

@Neeraj Sabharwal : what should be the ideal replication to be used with setrep if i have 4 datanodes?

balay80 · ‎03-08-2016

executing a sample job using curl -iku guest:guest-password -X POST -d arg=/user/guest/knox-sample/input -d arg=/user/guest/knox-sample/output -d jar=/user/guest/knox-sample/lib/hadoop-examples.jar -d class=wordcount https://localhost:8443/gateway/sandbox/templeton/v1/mapreduce/jar throws exception: HTTP/1.1 500 Server Error Set-Cookie: JSESSIONID=nudt2jfbtz4q1r0sx5p3nauq3;Path=/gateway/sandbox;Secure;HttpOnly Expires: Thu, 01 Jan 1970 00:00:00 GMT Server: Jetty(7.6.0.v20120127) Content-Type: application/json Content-Length: 136 {"error":"Cannot initialize Cluster. Please check your configuration for mapreduce.framework.name and the correspond server addresses.

balay80 · ‎03-08-2016

@Kevin Minder thanks Kevin, I missed to add knox_sample topology file in {GATEWAY_HOME}/conf/topologies directory

balay80 · ‎03-07-2016

curl -iku guest:guest-password -X put 'https://localhost:8443/gateway/knox_sample/webhdfs/v1/user/guest/knox-sample?op=MKDIRS&permission=777' HTTP/1.1 404 Not Found Content-Length: 0 Server: Jetty(8.1.14.v20131031)

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Date Registered	‎02-05-2016 07:18 AM
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Re: ERROR [main] master.HMasterCommandLine: Master...

Re: ERROR WHILE STARTING HBASE_MASTER_TableExistsS...

Re: Installation per Component using Ambari

Re: Hive in Hue time out error..

Re: Error in RedHat7 when trying to install ambari...

Re: Kerberos between two clusters is failing

Re: Confusion between users in Ranger

Re: ERROR [main] master.HMasterCommandLine: Master...

ERROR [main] master.HMasterCommandLine: Master exi...

Re: I have a problem when I am reviewing the clust...

Re: Job browser in hue does not work for Kerberos ...

Re: Re-install (or restore) a failed Master Node w...

UnicodeEncodeError: 'ascii' codec can't encode cha...

Re: ERROR WHILE STARTING HBASE_MASTER_TableExistsS...

Re: Falcon cluster onboarding & oozie URLs

Re: Hive JOB failed --map.xml not exist

Re: Install Hue on Ubuntu 14.04

Re: Hive in Hue time out error..

Re: Installation per Component using Ambari

Re: Unable to setup HUE UI for HDP 2.4.0

Re: Unable to setup HUE UI for HDP 2.4.0

Re: Hive in Hue time out error..

Re: Error in RedHat7 when trying to install ambari...

Re: Error while connecting to hive from Spark usin...

Re: hive metastore hangs in kerberos enabled clust...

hive metastore hangs in kerberos enabled cluster w...

Re: Error in Beeline

Re: Target Replicas is 10 but found 3 replica(s) -...

Cannot initialize Cluster. Please check your confi...

Re: Error HTTP/1.1 404 Not Found Content-Length: 0...

Error HTTP/1.1 404 Not Found Content-Length: 0 Ser...