A High Number of Dropped Packets Appear on the BDA (Doc ID 2100678.1)

Last updated on MARCH 20, 2016

Applies to:

Big Data Appliance Integrated Software - Version 4.2.0 and later
Linux x86-64

Symptoms

 Cloudera Manager may show a message about packet loss or ifconfig may show a high packet loss.

Frame Errors Leading To Packet Loss: Detected significant packet loss on 11 host(s), with the worst case being host: domain.name.com dropping: 5.30% of packets:

 

# ifconfig
bondeth0  Link encap:Ethernet  HWaddr 1A:B8:0A:80:03:DC
          inet addr:10.x.x.x  Bcast:10.x.x.x  Mask:255.255.240.0
          UP BROADCAST RUNNING MASTER MULTICAST  MTU:1500  Metric:1
          RX packets:785295 errors:0 dropped:376157 overruns:0 frame:0
          TX packets:31794 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:55252273 (52.6 MiB)  TX bytes:8963051 (8.5 MiB)

Ifconfig uses the ioctl access method to get the full address information, which limits hardware addresses to 8 bytes.
Because Infiniband address has 20 bytes, only the first 8 bytes are displayed correctly.
Ifconfig is obsolete! For replacement check ip.
bondib0   Link encap:InfiniBand  HWaddr 80:00:00:4A:FE:80:00:00:00:00:00:00:00:00:00:00:00:00:00:00
          inet addr:192.x.x.x  Bcast:192.x.x.x  Mask:255.255.248.0
          UP BROADCAST RUNNING MASTER MULTICAST  MTU:65520  Metric:1
          RX packets:25204927 errors:0 dropped:8013493 overruns:0 frame:0
          TX packets:9374287 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:15987733540 (14.8 GiB)  TX bytes:5986045816 (5.5 GiB)

eth0      Link encap:Ethernet  HWaddr 00:21:28:C0:9B:9C
          inet addr:10.x.x.x  Bcast:10.x.x.x  Mask:255.255.248.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:5574583 errors:0 dropped:144774 overruns:0 frame:0
          TX packets:103425 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:351607927 (335.3 MiB)  TX bytes:6505554 (6.2 MiB)

eth8      Link encap:Ethernet  HWaddr 1A:B7:0A:80:03:DC
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:376162 errors:0 dropped:376088 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:25723618 (24.5 MiB)  TX bytes:0 (0.0 b)

eth9      Link encap:Ethernet  HWaddr 1A:B8:0A:80:03:DC
          UP BROADCAST RUNNING SLAVE MULTICAST  MTU:1500  Metric:1
          RX packets:409133 errors:0 dropped:68 overruns:0 frame:0
          TX packets:31794 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:29528655 (28.1 MiB)  TX bytes:8963051 (8.5 MiB)

 

Changes

 There was an upgrade to a Linux Kernal 2.6.37 higher.

Cause

Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms