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Subject: Getting scans to timeout
Date: Thu, 27 Sep 2012 14:45:43 -0400
Message-ID: 
 <6548F17059905B48B2A6F28CE3692BAA0CE2973A@OAEXCH4SERVER.oa.oclc.org>
Thread-Topic: Getting scans to timeout
Thread-Index: Ac2c4EyT1rSbquywQY6hmHDLrDTiZg==
From: "Espinoza,Carlos" <espinozca@oclc.org>
To: <user@hbase.apache.org>

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Hi

Thanks for you help. I've been doing this in a pseudo-distributed
hbase-0.92.1 environment with one region server. I'm trying to scan a
table and see it timeout. I'm trying to recreate a scenario where the RS
is not responding (for instance due to NIC failure). So I've been
issuing a 'kill -STOP' to the region server, and I expected the client
to timeout but instead it just blocks at HTable.getScanner(). There is
no output, no retries, nothing. I understand that I'm pausing the
execution on the region server, but from a client perspective, I'm
thinking that this should not matter.

=20

My question is, is this a fair test? And if it is, any idea on how I can
get it to not block? I've been playing around with client side settings,
but no success. I've tried these settings (10sec)

=20

conf.setInt("hbase.rpc.timeout", 10000);

conf.setInt("hbase.client.operation.timeout", 10000);

=20

I've also tried these

HBaseClient.setSocketTimeout(this.conf, 10000);

HBaseClient.setPingInterval(this.conf, 10000);

=20

This is the jstack output of my application after I "STOP" the region
server

=20

"main" prio=3D10 tid=3D0x000000005c812000 nid=3D0x594e in Object.wait()
[0x00000000410c4000]

   java.lang.Thread.State: WAITING (on object monitor)

      at java.lang.Object.wait(Native Method)

      - waiting on <0x00002aaae205ee80> (a
org.apache.hadoop.hbase.ipc.HBaseClient$Call)

      at java.lang.Object.wait(Object.java:485)

      at
org.apache.hadoop.hbase.ipc.HBaseClient.call(HBaseClient.java:904)

      - locked <0x00002aaae205ee80> (a
org.apache.hadoop.hbase.ipc.HBaseClient$Call)

      at
org.apache.hadoop.hbase.ipc.WritableRpcEngine$Invoker.invoke(WritableRpc
Engine.java:150)

      at $Proxy4.openScanner(Unknown Source)

      at
org.apache.hadoop.hbase.client.ScannerCallable.openScanner(ScannerCallab
le.java:120)

      at
org.apache.hadoop.hbase.client.ScannerCallable.call(ScannerCallable.java
:76)

      at
org.apache.hadoop.hbase.client.ScannerCallable.call(ScannerCallable.java
:39)

      at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementat
ion.getRegionServerWithRetries(HConnectionManager.java:1325)

      at
org.apache.hadoop.hbase.client.HTable$ClientScanner.nextScanner(HTable.j
ava:1246)

      at
org.apache.hadoop.hbase.client.HTable$ClientScanner.initialize(HTable.ja
va:1169)

      at
org.apache.hadoop.hbase.client.HTable.getScanner(HTable.java:670)

      at
org.apache.hadoop.hbase.client.HTablePool$PooledHTable.getScanner(HTable
Pool.java:381)

      at
org.oclc.higgins.hbase.util.HBaseUtils.getHBaseRegions(HBaseUtils.java:9
5)

      at
org.oclc.higgins.hbase.snoop.Snoop.getCatalogRowsGroupedByRegionServer(S
noop.java:392)

      at org.oclc.higgins.hbase.snoop.Snoop.watch(Snoop.java:318)

      at org.oclc.higgins.hbase.snoop.Snoop.main(Snoop.java:278)

      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

      at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav
a:39)

      at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.java:25)

      at java.lang.reflect.Method.invoke(Method.java:597)

      at org.apache.hadoop.util.RunJar.main(RunJar.java:197)

=20


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