Can you take a look at the below links for creating the ORC table with the Snappy compression question?   https://community.cloudera.com/t5/Support-Questions/Data-Compression-Doesn-t-work-in-ORC-with-SNAPPY-Compression/td-p/172151 https://community.cloudera.com/t5/Support-Questions/Snappy-vs-Zlib-Pros-and-Cons-for-each-compression-in-Hive/m-p/97110 https://community.cloudera.com/t5/Community-Articles/Performance-Comparison-b-w-ORC-SNAPPY-and-ZLib-in-hive-ORC/ta-p/246948 ... View more

Hi @nareshbattula    Q1: hive metastore performance Based on the memory tuning the performance could vary. Please check the below link to see how to set the memory stuff https://docs.cloudera.com/documentation/enterprise/5-7-x/topics/admin_hive_tuning.html   Q2: which tables/dbs causing more pressure on Hivemetastore You may have to check in the HMS logs to see which query is taking a long time.   If you are using HDP you can find the current Memory pressure and Heap usage details via the below link https://docs.cloudera.com/HDPDocuments/Ambari-2.7.5.0/using-ambari-core-services/content/amb_hive_hivemetastore.html https://docs.cloudera.com/HDPDocuments/Ambari-2.7.5.0/using-ambari-core-services/content/amb_hive_home.html   If you are using CM then you can see the details in below link CM > Hive > Hivemetastore > Charts > JVM Heap Usage/JVM Pause Time/   Q3: number of connections on HMS? You can run the below commands to see the established connection/number of connections to HMS   netstat -ntpla | grep 9083 lsof -p <hms pid> | grep "ESTABLISHED" -i   If you are using CM then you can see the details in the below link CM > Hive > Hivemetastore > Charts > Open connections   If you are happy with the reply, mark it Accept as Solution ... View more

Hi @manojamr    Step 1: Could you run the following commands to gather column statistics for all the table that is involved in the query. analyze table <TABLE-NAME> compute statistics; analyze table <TABLE-NAME> compute statistics for columns; Reference: https://cwiki.apache.org/confluence/display/Hive/StatsDev   Step 2: set the following property in session level set hive.tez.container.size=10240 ; set hive.tez.java.opts=-Xmx8192m; set tez.runtime.io.sort.mb=4096; set tez.task.resource.memory.mb=7680; set tez.am.resource.memory.mb=10240; set tez.am.launch.cmd-opts=-Xmx8192m;   If Step2 got succes ignore step 3.   Step 3: Re-run the job at the beeline session-level. If the job fails again, I would request the below details. 1. Complete query, 2. Beeline console output, 3. QueryId of the job 4. HS2 and HMS logs and 5. Application logs. ... View more

Hi @saikat  As I can understand you are running a merge query and it is failing with java.lang.OutOfMemoryError error.   Step 1: Could you please run major compaction on all the tables involves in the merge query(If it is an ACID table or else ignore step1). Once the major compaction is triggered make sure it got completed by running "show compactions;" command in the beeline. This will bring down some stats collection burden for the hive. How to run minor and major compaction? Alter table <table name> compact 'MAJOR'; Step 2: Once step1 is done. Please set the following propery in beeline session level and re-run the merge query set hive.tez.container.size=16384; set hive.tez.java.opts=-Xmx13107m; set tez.runtime.io.sort.mb=4096; set tez.task.resource.memory.mb=16384; set tez.am.resource.memory.mb=16384; set tez.am.launch.cmd-opts=-Xmx13107m; set hive.auto.convert.join=false; The TEZ container and AM size is set as 16GB, if the query got failed you can increase the value to 20GB(then hive.tez.java.opts and tez.am.launch.cmd-opts need to be configured 80% of container and AM size that is 16384). If the query got succeeded with 16GB of TEZ container and AM size then you can try to decrease it too 14/12/10 and figure out a benchmark where it is failing and getting succeeded. In this way, you can save resources. If you are happy with the comment, Mark it "Accept as Solution". ... View more

If I installed a later version of Zookeeper (for example), would ambari recognize that later version in it's management? Or would it exist in parallel with the version of Zookeeper packaged with 3.1.5?   > You have to install zookeeper or any component via Ambari only, if you install it manually(via yum or apt) in the server ambari will not recognize or it will not consider it.   Grafana is running v6.4.2, but has a major security issue that was patched in future releases: https://grafana.com/blog/2020/06/03/grafana-6.7.4-and-7.0.2-released-with-important-security-fix/ Infra Solr is running SOLR 7.7 and has an RCE vulnerability. This was patched in SOLR 8.3, which is not part of Ambari 2.7.5's InfraSolr. Zookeeper packaged is 3.4.6, but SSL implementation was added in 3.5.5   > As mentioned already please create a support case with Cloudera along with the vulnerability CVE number so we can check with our team and confirm whether our product is vulnerable to the security concern or not. If it is so we can provide a patch to overcome it.   If you are happy with the comment, Mark it "Accept as Solution". ... View more

Hi @Nil_kharat    Generally, in Hive you may see Query slowness, Query failure, Configuration issue, Alerts, Services down, Vulnerability issue, some bugs this kind of issues you may see.   ... View more

Hi @Nil_kharat    If you are running a hive job and if you noticed it is slower than the earlier run then you may need to check few things in the below order.   1. Is there any change in the code, 2. Is there any new data load added to the table which is getting processed, 3. Beeline console output where you can see the Hive counters details, 4. Hiveserver2 and Hivemetastore logs to see the compilation and execution time of the faster and slower run. 5. QueryId of the job(to check in HS2 and application logs) 6. Faster and slower run of application logs where identify the slowness. 7. explain <query> for the faster and slower(to see the record change and stats info) If you are happy with the response mark it as Accept as Solution ... View more

Hi @amitshanker    Thanks for the update.   I can see than you had set hive.server2.webui.use.spnego as true, that means kerberos is enabled in your cluster.   If spnego and kerberos are enabled then few settings needs to be changed in browser. Could you please follow the below link.   https://docs.cloudera.com/documentation/enterprise/6/6.3/topics/cdh_sg_browser_access_kerberos_protected_url.html ... View more

Thanks for the details.   Can you share the hive-site.xml file Can you share me the complete screenshot of the error you are facing Do you have kerberos enabled in your cluster? ... View more

Hi @amitshanker    Could you let me know whether you are using CDH/HDP/CDP? What is the document which you had followed to enable HS2 UI? Can you share me the screenshot of the error you are facing Do you have kerberos enabled in your cluster? ... View more

Hi @ryu  [root@test02 ~]# hdfs dfs -rmr /tmp/root/testdirectory ... ... 21/08/11 12:08:30 WARN fs.TrashPolicyDefault: Can't create trash directory: hdfs://test/user/root/.Trash/Current/tmp/root ... ... rmr: Failed to move to trash: hdfs://test/tmp/root/testdirectory: Permission denied: user=root, access=WRITE, inode="/user":hdfs:hdfs:drwxr-xr-x   Upon checking the logs you are trying to delete a testdirectory and if you do that it will try to move the file to trash directory(since trash is enabled) under "/user/root/.Trash" location.   Since the folder /user("inode="/user":hdfs:hdfs:drwxr-xr-x") has hdfs as primary and group so eventually the user root falls under others(that is the third one r-x). The other users does not have write permission so that he was not able to write.   Either give write permission for user root in to the folder or try to delete the folder as hdfs user to overcome the issue.   If you are happy with the reply, mark it Accept as Solution ... View more

Hi @Nil_kharat    Question: Can anyone tell me how to check how many users are connected to the hive server2? Answer: Login to the server where hiveserver2 is running and run the below command to figure out the number of connections to the HS2 # netstat -ntpl | grep 10000 In the above command 10000 is the HS2 port number You can also check this from Cloudera manager CM > Hive_on_Tez > Instances > HiveServer2 > Open Connections And along with can we see which user is connected? If you enable Hiveserver2 UI then under Active Sessions you can see which user connected from which IP. Please check the below link. https://cwiki.apache.org/confluence/display/Hive/Setting+Up+HiveServer2#SettingUpHiveServer2-WebUIforHiveServer2   If you are happy with the answer, mark it Accept as solution ... View more