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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-13068) Unexpected client exception with slow scan
Date Wed, 18 Feb 2015 20:48:11 GMT

     [ https://issues.apache.org/jira/browse/HBASE-13068?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl updated HBASE-13068:
----------------------------------
    Affects Version/s: 0.98.10.1

> Unexpected client exception with slow scan
> ------------------------------------------
>
>                 Key: HBASE-13068
>                 URL: https://issues.apache.org/jira/browse/HBASE-13068
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.98.10.1
>            Reporter: Lars Hofhansl
>
> I just came across in interesting exception:
> {code}
> Caused by: java.io.IOException: Call 10 not added as the connection newbunny/127.0.0.1:60020/ClientService/lars
(auth:SIMPLE)/60000 is closing
>         at org.apache.hadoop.hbase.ipc.RpcClient$Connection.addCall(RpcClient.java:495)
>         at org.apache.hadoop.hbase.ipc.RpcClient.getConnection(RpcClient.java:1534)
>         at org.apache.hadoop.hbase.ipc.RpcClient.call(RpcClient.java:1442)
>         ... 13 more
> {code}
> Called from here:
> {code}
>         at org.apache.hadoop.hbase.client.ScannerCallable.close(ScannerCallable.java:291)
>         at org.apache.hadoop.hbase.client.ScannerCallable.call(ScannerCallable.java:160)
>         at org.apache.hadoop.hbase.client.ScannerCallable.call(ScannerCallable.java:59)
>         at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:115)
>         at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:91)
>         at org.apache.hadoop.hbase.client.ClientScanner.nextScanner(ClientScanner.java:247)
> {code}
> This happened when I scanned with multiple client against a single region server when
all data is filtered at the server by a filter.
> I had 10 clients, the region server has 30 handles.
> This means the scanners are not getting closed and their lease has to expire.
> The workaround is to increase hbase.ipc.client.connection.maxidletime.
> But it's strange that this *only* happens at close time. And since I am not using up
all handlers there shouldn't be any starvation.



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