Lars Hofhansl created HBASE-13068:
-------------------------------------
Summary: Unexpected client exception with slow scan
Key: HBASE-13068
URL: https://issues.apache.org/jira/browse/HBASE-13068
Project: HBase
Issue Type: Bug
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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