调度中心日志删除优化，改为分页获取ID并根据ID删除的方式，避免批量删除海量日志导致死锁问题

doc/XXL-JOB官方文档.md

 - 19、调度中心移除SQL中的 "now()" 函数；集群部署时不再依赖DB时钟，仅需要保证调度中心应用节点时钟一致即可；
 - 20、xxl-rpc服务端线程优化，降低线程内存开销；
 - 21、调度中心回调API服务改为restful方式；
-- 22、[ING]调度日志优化：支持设置日志保留天数，过期日志天维度记录报表，并清理；调度报表汇总实时数据和报表；
-- 23、[ING]调度中心日志删除，改为分页获取ID，根据ID删除的方式；
+- 22、调度中心日志删除优化，改为分页获取ID并根据ID删除的方式，避免批量删除海量日志导致死锁问题；
+- 23、[ING]调度日志优化：支持设置日志保留天数，过期日志天维度记录报表，并清理；调度报表汇总实时数据和报表；
 
 
 
 - 34、通讯调整；双向HTTP，回调和其他API自定义AccessToken，Restful，执行器复用容器端口；
 - 35、父子任务参数传递；流程任务等，透传动态参数；
 - 36、任务操作API服务调整为和回调服务一致，降低接入成本；
+- 37、新增执行器描述、任务描述属性；
 
 
 ## 七、其他

xxl-job-admin/src/main/java/com/xxl/job/admin/controller/JobLogController.java

 			return new ReturnT<String>(ReturnT.FAIL_CODE, I18nUtil.getString("joblog_clean_type_unvalid"));
 		}
 
-		xxlJobLogDao.clearLog(jobGroup, jobId, clearBeforeTime, clearBeforeNum);
+		List<Long> logIds = null;
+		do {
+			logIds = xxlJobLogDao.findClearLogIds(jobGroup, jobId, clearBeforeTime, clearBeforeNum, 1000);
+			if (logIds!=null && logIds.size()>0) {
+				xxlJobLogDao.clearLog(logIds);
+			}
+		} while (logIds!=null && logIds.size()>0);
+
 		return ReturnT.SUCCESS;
 	}
 

xxl-job-admin/src/main/java/com/xxl/job/admin/dao/XxlJobLogDao.java

 	public List<Map<String, Object>> triggerCountByDay(@Param("from") Date from,
 													   @Param("to") Date to);
 
-	public int clearLog(@Param("jobGroup") int jobGroup,
-						@Param("jobId") int jobId,
-						@Param("clearBeforeTime") Date clearBeforeTime,
-						@Param("clearBeforeNum") int clearBeforeNum);
+	public List<Long> findClearLogIds(@Param("jobGroup") int jobGroup,
+									  @Param("jobId") int jobId,
+									  @Param("clearBeforeTime") Date clearBeforeTime,
+									  @Param("clearBeforeNum") int clearBeforeNum,
+									  @Param("pagesize") int pagesize);
+	public int clearLog(@Param("logIds") List<Long> logIds);
 
 	public List<Long> findFailJobLogIds(@Param("pagesize") int pagesize);
 

xxl-job-admin/src/main/resources/mybatis-mapper/XxlJobLogMapper.xml

 		ORDER BY triggerDay
     </select>
 
-	<delete id="clearLog" >
-		delete from xxl_job_log
+	<select id="findClearLogIds" resultType="long" >
+		SELECT id FROM xxl_job_log
 		<trim prefix="WHERE" prefixOverrides="AND | OR" >
 			<if test="jobGroup gt 0">
 				AND job_group = #{jobGroup}
 			</if>
 			<if test="clearBeforeNum gt 0">
 				AND id NOT in(
-					SELECT id FROM(
-						SELECT id FROM xxl_job_log AS t
-						<trim prefix="WHERE" prefixOverrides="AND | OR" >
-							<if test="jobGroup gt 0">
-								AND t.job_group = #{jobGroup}
-							</if>
-							<if test="jobId gt 0">
-								AND t.job_id = #{jobId}
-							</if>
-						</trim>
-						ORDER BY t.trigger_time desc
-						LIMIT 0, #{clearBeforeNum}
-					) t1
+				SELECT id FROM(
+				SELECT id FROM xxl_job_log AS t
+				<trim prefix="WHERE" prefixOverrides="AND | OR" >
+					<if test="jobGroup gt 0">
+						AND t.job_group = #{jobGroup}
+					</if>
+					<if test="jobId gt 0">
+						AND t.job_id = #{jobId}
+					</if>
+				</trim>
+				ORDER BY t.trigger_time desc
+				LIMIT 0, #{clearBeforeNum}
+				) t1
 				)
 			</if>
 		</trim>
+		order by id asc
+		LIMIT #{pagesize}
+	</select>
+
+	<delete id="clearLog" >
+		delete from xxl_job_log
+		WHERE id in
+		<foreach collection="logIds" item="item" open="(" close=")" separator="," >
+			#{item}
+		</foreach>
 	</delete>
 
 	<select id="findFailJobLogIds" resultType="long" >