[IMPALA-10962] Toolchain Python loses readline functionality on Ubuntu 20.04

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: Impala 4.0.0
• Fix Version/s: Impala 4.2.0
• Epic Color: ghx-label-5
• Assignee: Joe McDonnell
• Reporter: Laszlo Gaal
• Created: 11/Oct/21 15:08
• Updated: 21/Jun/22 16:35
• Resolved: 21/Jun/22 16:35

Description

Toolchain Python lacks readline functionality when running on Ubuntu 20.04.

The most visible corollary is that impala-shell loses command-line editing capabilities as well.

This happens because the Impala project currently uses UBuntu 18 binaries when it detects a Ubuntu 20 platform (see IMPALA-10199). Toolchain Python built on Ubuntu 18 binds to libreadline.so.7, which doesn't exist on Ubuntu 20. only the libreadline.so.8 is provided.

The workaround is relatively easy; execute as root:

# cd /lib/x86_64-linux-gnu
# ln -s libreadline.so.8 libreadline.so.7

but this is not obvious, and Impala contributors should not be forced to execute this.

Issue Links

• is blocked by: IMPALA-10199 Need to update bootstrap_toolchain.py with the 20.04 version of toolchain file when available
• is duplicated by: IMPALA-10963 impala-shell lacks line editing when run on Ubuntu 20.04