fix tablet merge dag log print
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		@ -20,7 +20,7 @@
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namespace oceanbase
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{
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using namespace oceanbase::common;
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using namespace common;
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using namespace share;
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namespace compaction
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@ -32,9 +32,9 @@ namespace compaction
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    if (OB_FAIL(MTL(ObTenantDagScheduler*)->create_and_add_dag(¶m, dag, is_emergency))) {  \
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      if (OB_SIZE_OVERFLOW != ret && OB_EAGAIN != ret) { \
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        LOG_WARN("failed to create merge dag", K(ret), K(param)); \
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      } else { \
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        LOG_DEBUG("success to schedule tablet merge dag", K(ret), K(param)); \
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      } \
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    } else { \
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      LOG_DEBUG("success to schedule tablet merge dag", K(ret), K(param), K(*dag)); \
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    } \
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  }
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@ -269,21 +269,29 @@ int ObBasicTabletMergeDag::get_tablet_and_compat_mode()
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int64_t ObBasicTabletMergeDag::to_string(char* buf, const int64_t buf_len) const
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{
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  int ret = OB_SUCCESS;
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  if (OB_FAIL(ObIDag::to_string(buf, buf_len))) {
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    LOG_WARN("failed to call to ObIDag::string", K(ret), K(buf_len));
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  } else if (OB_FAIL(param_.to_string(buf, buf_len))) {
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    LOG_WARN("failed to call to ObTabletMergeDagParam::string", K(ret), K(buf_len));
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  } else if (OB_FAIL(common::databuff_printf(buf, buf_len, ", compat_mode_=%d,", compat_mode_))) {
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    LOG_WARN("failed to print compat mode", K(ret), K(compat_mode_));
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  } else if (OB_NOT_NULL(ctx_)) {
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    if (OB_FAIL(ctx_->sstable_version_range_.to_string(buf, buf_len))) {
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      LOG_WARN("failed to call to version range", K(ret), K(buf_len));
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    } else if (OB_FAIL(ctx_->scn_range_.to_string(buf, buf_len))) {
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      LOG_WARN("failed to call to log ts range", K(ret), K(buf_len));
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  int64_t pos = 0;
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  if (OB_ISNULL(buf) || buf_len <= 0) {
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    // do nothing
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  } else {
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    databuff_printf(buf, buf_len, pos, "{");
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    databuff_printf(buf, buf_len, pos, "ObIDag:");
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    pos += ObIDag::to_string(buf + pos, buf_len - pos);
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    databuff_print_json_kv_comma(buf, buf_len, pos, "param", param_);
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    databuff_print_json_kv_comma(buf, buf_len, pos, "compat_mode", compat_mode_);
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    if (nullptr == ctx_) {
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      databuff_print_json_kv_comma(buf, buf_len, pos, "ctx", ctx_);
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    } else {
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      databuff_printf(buf, buf_len, pos, ", ctx:{");
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      databuff_print_json_kv(buf, buf_len, pos, "sstable_version_range", ctx_->sstable_version_range_);
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      databuff_print_json_kv_comma(buf, buf_len, pos, "scn_range", ctx_->scn_range_);
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      databuff_printf(buf, buf_len, pos, "}");
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    }
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    databuff_printf(buf, buf_len, pos, "}");
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  }
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  return ret;
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  return pos;
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}
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int ObBasicTabletMergeDag::inner_init(const ObTabletMergeDagParam ¶m)
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