[jira] [Commented] (HBASE-4220) Lots of DNS queries from client

["Todd Lipcon (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-4220?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13086643#comment-13086643 ] 

Todd Lipcon commented on HBASE-4220:
------------------------------------

I managed to snag the following stack trace:

{noformat}
"pool-1-thread-1" prio=10 tid=0x00002aac380e4800 nid=0x7797 runnable [0x0000000040d4d000]
   java.lang.Thread.State: RUNNABLE
        at java.lang.Throwable.fillInStackTrace(Native Method)
        - locked <0x00002aabb74d06b8> (a java.lang.NumberFormatException)
        at java.lang.Throwable.<init>(Throwable.java:196)
        at java.lang.Exception.<init>(Exception.java:41)
        at java.lang.RuntimeException.<init>(RuntimeException.java:43)
        at java.lang.IllegalArgumentException.<init>(IllegalArgumentException.java:36)
        at java.lang.NumberFormatException.<init>(NumberFormatException.java:38)
        at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
        at java.lang.Integer.parseInt(Integer.java:449)
        at java.lang.Integer.parseInt(Integer.java:499)
        at sun.net.util.IPAddressUtil.textToNumericFormatV4(IPAddressUtil.java:94)
        at java.net.InetAddress.getAllByName(InetAddress.java:1051)
        at java.net.InetAddress.getAllByName(InetAddress.java:1020)
        at java.net.InetAddress.getByName(InetAddress.java:970)
        at java.net.InetSocketAddress.<init>(InetSocketAddress.java:124)
        at org.apache.hadoop.hbase.HServerAddress.<init>(HServerAddress.java:75)
        at org.apache.hadoop.hbase.HRegionLocation.getServerAddress(HRegionLocation.java:101)
        at org.apache.hadoop.hbase.client.ServerCallable.instantiateServer(ServerCallable.java:71)
        at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getRegionServerWithRetries(HConnectionManager.java:1238)
        at org.apache.hadoop.hbase.client.HTable.get(HTable.java:612)
{noformat}

> Lots of DNS queries from client
> -------------------------------
>
>                 Key: HBASE-4220
>                 URL: https://issues.apache.org/jira/browse/HBASE-4220
>             Project: HBase
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 0.92.0
>            Reporter: Todd Lipcon
>            Priority: Critical
>             Fix For: 0.92.0
>
>
> In running a YCSB workload, I managed to DDOS a DNS server since it seems to be flooding lots of DNS requests. Installing nscd on the client machines improved throughput by a factor of 6 and stopped killing the server. These are long-running clients, so it's not clear why we do so many lookups.

--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira