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https://issues.apache.org/jira/browse/HIVE-13527?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Naveen Gangam updated HIVE-13527:
---------------------------------
Status: Patch Available (was: Open)
> 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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