[HDFS-12349] Improve log message when it could not alloc enough blocks for EC

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.0.0-alpha3
• Fix Version/s: 3.0.0-beta1
• Component/s: erasure-coding
• Target Version/s: 3.0.0-beta1
• Assignee: Lei (Eddy) Xu
• Reporter: Lei (Eddy) Xu
• Created: 24/Aug/17 18:49
• Updated: 15/Sep/17 19:43
• Resolved: 15/Sep/17 19:16

Description

When an EC output stream could not alloc enough blocks for parity blocks, it sets the warning.

if (blocks[i] == null) {
        LOG.warn("Failed to get block location for parity block, index=" + i);

We should clarify the cause of this warning message.