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https://issues.apache.org/jira/browse/HIVE-20042?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16539265#comment-16539265
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Sergey Shelukhin commented on HIVE-20042:
-----------------------------------------
cc [~thejas] looks like the continuation from the epic locking patch... maybe
the config needs to be cloned, too?
> HiveServer2: All operations lock on a Single HiveConf object
> -------------------------------------------------------------
>
> Key: HIVE-20042
> URL: https://issues.apache.org/jira/browse/HIVE-20042
> Project: Hive
> Issue Type: Bug
> Components: HiveServer2
> Affects Versions: 3.0.0
> Reporter: Gopal V
> Priority: Major
> Labels: Concurrency
>
> With the 1000 user test, the session start/tear-down runs only at 100% CPU,
> which is due to all threads locking on the same HiveConf object.
> OpenSession locks on 0x00000005c091a3a0
> {code}
> "HiveServer2-HttpHandler-Pool: Thread-65084" #65084 prio=5 os_prio=0
> tid=0x00000000103bb000 nid=0x4a09 waiting for monitor entry
> [0x00007fc1b0987000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at
> org.apache.hadoop.conf.Configuration.getOverlay(Configuration.java:1418)
> - waiting to lock <0x00000005c091a3a0> (a
> org.apache.hadoop.hive.conf.HiveConf)
> at
> org.apache.hadoop.conf.Configuration.handleDeprecation(Configuration.java:711)
> at org.apache.hadoop.conf.Configuration.get(Configuration.java:1437)
> at org.apache.hadoop.hive.conf.HiveConf.getVar(HiveConf.java:4996)
> at org.apache.hadoop.hive.conf.HiveConf.getVar(HiveConf.java:5069)
> at
> org.apache.hive.service.cli.thrift.ThriftCLIService.getUserName(ThriftCLIService.java:424)
> at
> org.apache.hive.service.cli.thrift.ThriftCLIService.getSessionHandle(ThriftCLIService.java:467)
> at
> org.apache.hive.service.cli.thrift.ThriftCLIService.OpenSession(ThriftCLIService.java:325)
> {code}
> GetOperationStatus locks on the same
> {code}
> "HiveServer2-HttpHandler-Pool: Thread-65082" #65082 prio=5 os_prio=0
> tid=0x00007fc2656be000 nid=0x4a06 waiting for monitor entry
> [0x00007fc3159db000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at
> org.apache.hadoop.conf.Configuration.getOverlay(Configuration.java:1418)
> - waiting to lock <0x00000005c091a3a0> (a
> org.apache.hadoop.hive.conf.HiveConf)
> at
> org.apache.hadoop.conf.Configuration.handleDeprecation(Configuration.java:711)
> at org.apache.hadoop.conf.Configuration.get(Configuration.java:1437)
> at org.apache.hadoop.hive.conf.HiveConf.getVar(HiveConf.java:4996)
> at org.apache.hadoop.hive.conf.HiveConf.getVar(HiveConf.java:5069)
> at
> org.apache.hive.service.cli.thrift.ThriftCLIService.GetOperationStatus(ThriftCLIService.java:709)
> {code}
> Session clean up locks on the same
> {code}
> "8fd1db09-9f96-49dc-becf-5702826bd4f5 HiveServer2-HttpHandler-Pool:
> Thread-64981" #64981 prio=5 os_prio=0 tid=0x000000001d1ab000 nid=0x23d5
> waiting for monitor entry [0x00007fc1b65e3000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at
> org.apache.hadoop.conf.Configuration.getOverlay(Configuration.java:1418)
> - waiting to lock <0x00000005c091a3a0> (a
> org.apache.hadoop.hive.conf.HiveConf)
> at
> org.apache.hadoop.conf.Configuration.handleDeprecation(Configuration.java:711)
> at org.apache.hadoop.conf.Configuration.get(Configuration.java:1177)
> at
> org.apache.hadoop.conf.Configuration.getTrimmedStringCollection(Configuration.java:2122)
> at
> org.apache.hadoop.hdfs.DFSUtilClient.getNameServiceIds(DFSUtilClient.java:197)
> at org.apache.hadoop.hdfs.HAUtilClient.isLogicalUri(HAUtilClient.java:53)
> ...
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.delete(DistributedFileSystem.java:959)
> at org.apache.hadoop.hive.ql.Context.clear(Context.java:724)
> {code}
> Hadoop RPC blocks on the same
> {code}
> "HiveServer2-HttpHandler-Pool: Thread-59227" #59227 prio=5 os_prio=0
> tid=0x00007fc270aeb800 nid=0x129b waiting for monitor entry
> [0x00007fc28b7b5000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at
> org.apache.hadoop.conf.Configuration.getOverlay(Configuration.java:1418)
> - waiting to lock <0x00000005c091a3a0> (a
> org.apache.hadoop.hive.conf.HiveConf)
> at
> org.apache.hadoop.conf.Configuration.handleDeprecation(Configuration.java:711)
> at org.apache.hadoop.conf.Configuration.get(Configuration.java:1177)
> at
> org.apache.hadoop.conf.Configuration.getTrimmed(Configuration.java:1234)
> at org.apache.hadoop.conf.Configuration.getInt(Configuration.java:1459)
> at org.apache.hadoop.ipc.Client$Connection.<init>(Client.java:451)
> at org.apache.hadoop.ipc.Client.getConnection(Client.java:1532)
> ...
> at
> org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1580)
> at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1734)
> at org.apache.hadoop.fs.FileSystem.deleteOnExit(FileSystem.java:1677)
> at
> org.apache.hadoop.hive.ql.session.SessionState.createPath(SessionState.java:791)
> {code}
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