[jira] Commented: (HBASE-907) getScanner hangs with some startRows that are found if scanning entire table

["Jonathan Gray (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-907?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12635276#action_12635276 ] 

Jonathan Gray commented on HBASE-907:
-------------------------------------

Just received an exception in my client, I don't think this ever happened when I was running 0.19 but maybe I didn't leave it long enough.  This took >10 minutes

Exception in thread "main" java.lang.NullPointerException
        at java.lang.String.<init>(String.java:523)
        at org.apache.hadoop.hbase.util.Bytes.toString(Bytes.java:75)
        at org.apache.hadoop.hbase.client.RetriesExhaustedException.getMessage(RetriesExhaustedException.java:50)
        at org.apache.hadoop.hbase.client.RetriesExhaustedException.<init>(RetriesExhaustedException.java:40)
        at org.apache.hadoop.hbase.client.HConnectionManager$TableServers.getRegionServerWithRetries(HConnectionManager.java:863)
        at org.apache.hadoop.hbase.client.HTable$ClientScanner.nextScanner(HTable.java:1163)
        at org.apache.hadoop.hbase.client.HTable$ClientScanner.initialize(HTable.java:1108)
        at org.apache.hadoop.hbase.client.HTable.getScanner(HTable.java:733)
        at org.apache.hadoop.hbase.client.HTable.getScanner(HTable.java:575)
        at ItemTest.getItemSource(ItemTest.java:37)
        at ItemTest.main(ItemTest.java:13)


> getScanner hangs with some startRows that are found if scanning entire table
> ----------------------------------------------------------------------------
>
>                 Key: HBASE-907
>                 URL: https://issues.apache.org/jira/browse/HBASE-907
>             Project: Hadoop HBase
>          Issue Type: Bug
>    Affects Versions: 0.18.0, 0.18.1, 0.19.0
>            Reporter: Jonathan Gray
>            Priority: Critical
>             Fix For: 0.18.1, 0.19.0
>
>
> I have a table with 8 byte binary row keys.  There are a a few hundred thousands rows, each with two families and between 1k and 50k of total data across about 15 columns.
> When attempting to get a scanner using a specified startRow, my client freezes on the HT.getScanner(cols,row) with no exception ever thrown and no debug output in any server logs.
> If I get a scanner with HT.getScanner(cols) and then iterate through, I will eventually reach the row I was seeking before successfully.
> Some rows can be found, some cannot.  At this point I'm not able to distinguish anything special about the ones that cause the client the hang.
> At first I thought this was only a problem with 0.19 trunk as a downgrade to 0.18 resolved the issue for a particular key.  However other keys still have this issue on 0.18 branch.

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