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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14662) Fix NPE in HFileOutputFormat2
Date Wed, 21 Oct 2015 16:36:27 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14662?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14967405#comment-14967405
] 

stack commented on HBASE-14662:
-------------------------------

That is a nice find. Are there times when table can be legitimately null?

> Fix NPE in HFileOutputFormat2
> -----------------------------
>
>                 Key: HBASE-14662
>                 URL: https://issues.apache.org/jira/browse/HBASE-14662
>             Project: HBase
>          Issue Type: Sub-task
>            Reporter: Heng Chen
>         Attachments: HBASE-14662.patch
>
>
> When i dig in HBASE-14659,  i run testWritingPEData. There are a lot of NPE thrown and
testcase run a long time. 
> The reason is that, in {{HFileOutputFormat2}}
> {code}
>             HRegionLocation loc = null;
>             String tableName = conf.get(OUTPUT_TABLE_NAME_CONF_KEY);
>             try (Connection connection = ConnectionFactory.createConnection(conf);
>                    RegionLocator locator =
>                      connection.getRegionLocator(TableName.valueOf(tableName))) {
>               loc = locator.getRegionLocation(rowKey);
>             } catch (Throwable e) {
>               LOG.warn("there's something wrong when locating rowkey: " +
>                 Bytes.toString(rowKey), e);
>               loc = null;
>             }
> {code}
> Because we did not set {{OUTPUT_TABLE_NAME_CONF_KEY}}, So tableName is null,  So NPE
thrown.
> And connection will be created which RegionLocator use to find region location. Because
zk is not start in this testcase, So it will retry many times. 
> But all this actions are not required,  we can skip create connection by check whether
tableName is null



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