[jira] [Created] (HBASE-8671) Per-region WAL breaks CP backwards compatibility for non-enabled case

["Jesse Yates (JIRA)" <ji...@apache.org>]

Jesse Yates created HBASE-8671:
----------------------------------

             Summary: Per-region WAL breaks CP backwards compatibility for non-enabled case
                 Key: HBASE-8671
                 URL: https://issues.apache.org/jira/browse/HBASE-8671
             Project: HBase
          Issue Type: Bug
            Reporter: Jesse Yates
            Assignee: Jesse Yates


Moving from a single WAL to the possibility of multiple WALs, the method signature in RegionServerServices became:

{code}
  /** @return the HLog for a particular region. Pass null for getting the
   * default (common) WAL */
  public HLog getWAL(HRegionInfo regionInfo) throws IOException;
{code}

However, CPs that previously needed access to the WAL would just call:
{code}
RegionServerServices.getWAL();
{code}

Which is equivalent to calling:
{code}
RegionServerServices.getWAL(null);
{code}

but which requires a code change, recompilation, and possibly an additional compatibility layer for _different versions of 0.94_... not a great situation.



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