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From "Naveen Gangam (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-13527) Using deprecated APIs in HBase client causes zookeeper connection leaks.
Date Mon, 18 Apr 2016 14:01:25 GMT

     [ https://issues.apache.org/jira/browse/HIVE-13527?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Naveen Gangam updated HIVE-13527:
---------------------------------
    Status: Open  (was: Patch Available)

The test failures do not appear related but there are a lot of them. Hoping re-run would clear
them.

> Using deprecated APIs in HBase client causes zookeeper connection leaks.
> ------------------------------------------------------------------------
>
>                 Key: HIVE-13527
>                 URL: https://issues.apache.org/jira/browse/HIVE-13527
>             Project: Hive
>          Issue Type: Bug
>          Components: HiveServer2
>    Affects Versions: 1.1.0
>            Reporter: Naveen Gangam
>            Assignee: Naveen Gangam
>         Attachments: HIVE-13527.patch
>
>
> When running queries against hbase-backed hive tables, the following log messages are
seen in the HS2 log.
> {code}
> 2016-04-11 07:25:23,657 WARN org.apache.hadoop.hbase.mapreduce.TableInputFormatBase:
You are using an HTable instance that relies on an HBase-managed Connection. This is usually
due to directly creating an HTable, which is deprecated. Instead, you should create a Connection
object and then request a Table instance from it. If you don't need the Table instance for
your own use, you should instead use the TableInputFormatBase.initalizeTable method directly.
> 2016-04-11 07:25:23,658 INFO org.apache.hadoop.hbase.mapreduce.TableInputFormatBase:
Creating an additional unmanaged connection because user provided one can't be used for administrative
actions. We'll close it when we close out the table.
> {code}
> In a HS2 log file, there are 1366 zookeeper connections established but only a small
fraction of them were closed. So lsof would show 1300+ open TCP connections to Zookeeper.
> grep "org.apache.zookeeper.ClientCnxn: Session establishment complete on server" * |wc
-l
> 1366
> grep "INFO org.apache.zookeeper.ZooKeeper: Session:" * |grep closed |wc -l
> 54
> According to the comments in TableInputFormatBase, the recommended means for subclasses
like HiveHBaseTableInputFormat is to call initializeTable() instead of setHTable() that it
currently uses.
> "
> Subclasses MUST ensure initializeTable(Connection, TableName) is called for an instance
to function properly. Each of the entry points to this class used by the MapReduce framework,
{@link #createRecordReader(InputSplit, TaskAttemptContext)} and {@link #getSplits(JobContext)},
will call {@link #initialize(JobContext)} as a convenient centralized location to handle retrieving
the necessary configuration information. If your subclass overrides either of these methods,
either call the parent version or call initialize yourself.
> "
> Currently setHTable() also creates an additional Admin connection, even though it is
not needed.
> So the use of deprecated APIs are to be replaced.



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