long releaseWALEntryBatchBufferQuota(WALEntryBatch walEntryBatch) {
    long usedBufferSize = walEntryBatch.getUsedBufferSize();
    if (usedBufferSize > 0) {
      this.releaseBufferQuota(usedBufferSize);
    }
    return usedBufferSize;
  }
To release the buffer quota of {@link WALEntryBatch} which acquired by
{@link ReplicationSourceManager#acquireWALEntryBufferQuota}.
@return the released buffer quota size.
hbase-server/src/main/java/org/apache/hadoop/hbase/replication/regionserver/ReplicationSourceManager.java